diff --git a/cmd/owl/web/aliases_test.go b/cmd/owl/web/aliases_test.go
index 7382df7..58ca579 100644
--- a/cmd/owl/web/aliases_test.go
+++ b/cmd/owl/web/aliases_test.go
@@ -3,6 +3,7 @@ package web_test
 import (
 	"h4kor/owl-blogs"
 	main "h4kor/owl-blogs/cmd/owl/web"
+	"h4kor/owl-blogs/priv/assertions"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -25,26 +26,14 @@ func TestRedirectOnAliases(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", "/foo/bar", nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.Router(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusMovedPermanently {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusMovedPermanently)
-	}
-
+	assertions.AssertStatus(t, rr, http.StatusMovedPermanently)
 	// Check that Location header is set correctly
-	if rr.Header().Get("Location") != post.UrlPath() {
-		t.Errorf("Location header is not set correctly, expected: %v Got: %v",
-			post.UrlPath(),
-			rr.Header().Get("Location"),
-		)
-	}
+	assertions.AssertEqual(t, rr.Header().Get("Location"), post.UrlPath())
 }
 
 func TestNoRedirectOnNonExistingAliases(t *testing.T) {
@@ -63,18 +52,12 @@ func TestNoRedirectOnNonExistingAliases(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", "/foo/bar2", nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.Router(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusNotFound {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusNotFound)
-	}
+	assertions.AssertStatus(t, rr, http.StatusNotFound)
 
 }
 
@@ -94,18 +77,12 @@ func TestNoRedirectIfValidPostUrl(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", post2.UrlPath(), nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.Router(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusOK {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusOK)
-	}
+	assertions.AssertStatus(t, rr, http.StatusOK)
 
 }
 
@@ -124,18 +101,12 @@ func TestRedirectIfInvalidPostUrl(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", user.UrlPath()+"posts/not-a-real-post/", nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.Router(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusMovedPermanently {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusMovedPermanently)
-	}
+	assertions.AssertStatus(t, rr, http.StatusMovedPermanently)
 
 }
 
@@ -154,18 +125,12 @@ func TestRedirectIfInvalidUserUrl(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", "/user/not-real/", nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.Router(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusMovedPermanently {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusMovedPermanently)
-	}
+	assertions.AssertStatus(t, rr, http.StatusMovedPermanently)
 
 }
 
@@ -184,18 +149,12 @@ func TestRedirectIfInvalidMediaUrl(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", post.UrlMediaPath("not-real"), nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.Router(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusMovedPermanently {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusMovedPermanently)
-	}
+	assertions.AssertStatus(t, rr, http.StatusMovedPermanently)
 
 }
 
@@ -222,17 +181,11 @@ func TestDeepAliasInSingleUserMode(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", "/2016/09/13/create-tileable-textures-with-gimp/", nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.SingleUserRouter(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusMovedPermanently {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusMovedPermanently)
-	}
+	assertions.AssertStatus(t, rr, http.StatusMovedPermanently)
 
 }
diff --git a/cmd/owl/web/multi_user_test.go b/cmd/owl/web/multi_user_test.go
index 97c11ca..58d89c0 100644
--- a/cmd/owl/web/multi_user_test.go
+++ b/cmd/owl/web/multi_user_test.go
@@ -3,12 +3,12 @@ package web_test
 import (
 	"h4kor/owl-blogs"
 	main "h4kor/owl-blogs/cmd/owl/web"
+	"h4kor/owl-blogs/priv/assertions"
 	"math/rand"
 	"net/http"
 	"net/http/httptest"
 	"os"
 	"path"
-	"strings"
 	"testing"
 	"time"
 )
@@ -39,28 +39,16 @@ func TestMultiUserRepoIndexHandler(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", "/", nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.Router(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusOK {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusOK)
-	}
+	assertions.AssertStatus(t, rr, http.StatusOK)
 
 	// Check the response body contains names of users
-	if !strings.Contains(rr.Body.String(), "user_1") {
-		t.Error("user_1 not listed on index page. Got: ")
-		t.Error(rr.Body.String())
-	}
-	if !strings.Contains(rr.Body.String(), "user_2") {
-		t.Error("user_2 not listed on index page. Got: ")
-		t.Error(rr.Body.String())
-	}
+	assertions.AssertContains(t, rr.Body.String(), "user_1")
+	assertions.AssertContains(t, rr.Body.String(), "user_2")
 }
 
 func TestMultiUserUserIndexHandler(t *testing.T) {
@@ -70,24 +58,15 @@ func TestMultiUserUserIndexHandler(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", user.UrlPath(), nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.Router(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusOK {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusOK)
-	}
+	assertions.AssertStatus(t, rr, http.StatusOK)
 
 	// Check the response body contains names of users
-	if !strings.Contains(rr.Body.String(), "post-1") {
-		t.Error("post-1 not listed on index page. Got: ")
-		t.Error(rr.Body.String())
-	}
+	assertions.AssertContains(t, rr.Body.String(), "post-1")
 }
 
 func TestMultiUserPostHandler(t *testing.T) {
@@ -97,18 +76,12 @@ func TestMultiUserPostHandler(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", post.UrlPath(), nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.Router(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusOK {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusOK)
-	}
+	assertions.AssertStatus(t, rr, http.StatusOK)
 }
 
 func TestMultiUserPostMediaHandler(t *testing.T) {
@@ -119,24 +92,16 @@ func TestMultiUserPostMediaHandler(t *testing.T) {
 	// Create test media file
 	path := path.Join(post.MediaDir(), "data.txt")
 	err := os.WriteFile(path, []byte("test"), 0644)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", post.UrlMediaPath("data.txt"), nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.Router(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusOK {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusOK)
-	}
+	assertions.AssertStatus(t, rr, http.StatusOK)
 
 	// Check the response body contains data of media file
 	if !(rr.Body.String() == "test") {
diff --git a/cmd/owl/web/post_test.go b/cmd/owl/web/post_test.go
index 1b41982..2d7a6c9 100644
--- a/cmd/owl/web/post_test.go
+++ b/cmd/owl/web/post_test.go
@@ -3,6 +3,7 @@ package web_test
 import (
 	"h4kor/owl-blogs"
 	main "h4kor/owl-blogs/cmd/owl/web"
+	"h4kor/owl-blogs/priv/assertions"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -24,16 +25,10 @@ func TestPostHandlerReturns404OnDrafts(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", post.UrlPath(), nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.Router(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusNotFound {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusNotFound)
-	}
+	assertions.AssertStatus(t, rr, http.StatusNotFound)
 }
diff --git a/cmd/owl/web/rss_test.go b/cmd/owl/web/rss_test.go
index b799acf..2877100 100644
--- a/cmd/owl/web/rss_test.go
+++ b/cmd/owl/web/rss_test.go
@@ -3,9 +3,9 @@ package web_test
 import (
 	"h4kor/owl-blogs"
 	main "h4kor/owl-blogs/cmd/owl/web"
+	"h4kor/owl-blogs/priv/assertions"
 	"net/http"
 	"net/http/httptest"
-	"strings"
 	"testing"
 )
 
@@ -16,28 +16,16 @@ func TestMultiUserUserRssIndexHandler(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", user.UrlPath()+"index.xml", nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.Router(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusOK {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusOK)
-	}
+	assertions.AssertStatus(t, rr, http.StatusOK)
 
 	// Check the response Content-Type is what we expect.
-	if !strings.Contains(rr.Header().Get("Content-Type"), "application/rss+xml") {
-		t.Errorf("handler returned wrong Content-Type: got %v want %v",
-			rr.Header().Get("Content-Type"), "application/rss+xml")
-	}
+	assertions.AssertContains(t, rr.Header().Get("Content-Type"), "application/rss+xml")
 
 	// Check the response body contains names of users
-	if !strings.Contains(rr.Body.String(), "post-1") {
-		t.Error("post-1 not listed on index page. Got: ")
-		t.Error(rr.Body.String())
-	}
+	assertions.AssertContains(t, rr.Body.String(), "post-1")
 }
diff --git a/cmd/owl/web/single_user_test.go b/cmd/owl/web/single_user_test.go
index 9734d59..08ef094 100644
--- a/cmd/owl/web/single_user_test.go
+++ b/cmd/owl/web/single_user_test.go
@@ -3,6 +3,7 @@ package web_test
 import (
 	owl "h4kor/owl-blogs"
 	main "h4kor/owl-blogs/cmd/owl/web"
+	"h4kor/owl-blogs/priv/assertions"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -23,24 +24,15 @@ func TestSingleUserUserIndexHandler(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", user.UrlPath(), nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.SingleUserRouter(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusOK {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusOK)
-	}
+	assertions.AssertStatus(t, rr, http.StatusOK)
 
 	// Check the response body contains names of users
-	if !strings.Contains(rr.Body.String(), "post-1") {
-		t.Error("post-1 not listed on index page. Got: ")
-		t.Error(rr.Body.String())
-	}
+	assertions.AssertContains(t, rr.Body.String(), "post-1")
 }
 
 func TestSingleUserPostHandler(t *testing.T) {
@@ -49,18 +41,12 @@ func TestSingleUserPostHandler(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", post.UrlPath(), nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.SingleUserRouter(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusOK {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusOK)
-	}
+	assertions.AssertStatus(t, rr, http.StatusOK)
 }
 
 func TestSingleUserPostMediaHandler(t *testing.T) {
@@ -70,24 +56,16 @@ func TestSingleUserPostMediaHandler(t *testing.T) {
 	// Create test media file
 	path := path.Join(post.MediaDir(), "data.txt")
 	err := os.WriteFile(path, []byte("test"), 0644)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", post.UrlMediaPath("data.txt"), nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.SingleUserRouter(&repo)
 	router.ServeHTTP(rr, req)
 
-	// Check the status code is what we expect.
-	if status := rr.Code; status != http.StatusOK {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, http.StatusOK)
-	}
+	assertions.AssertStatus(t, rr, http.StatusOK)
 
 	// Check the response body contains data of media file
 	if !(rr.Body.String() == "test") {
@@ -117,9 +95,7 @@ func TestHasNoDraftsInList(t *testing.T) {
 
 	// Create Request and Response
 	req, err := http.NewRequest("GET", "/", nil)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error creating request")
 	rr := httptest.NewRecorder()
 	router := main.SingleUserRouter(&repo)
 	router.ServeHTTP(rr, req)
diff --git a/cmd/owl/web/webmention_test.go b/cmd/owl/web/webmention_test.go
index 04c68b8..e2c3105 100644
--- a/cmd/owl/web/webmention_test.go
+++ b/cmd/owl/web/webmention_test.go
@@ -3,6 +3,7 @@ package web_test
 import (
 	"h4kor/owl-blogs"
 	main "h4kor/owl-blogs/cmd/owl/web"
+	"h4kor/owl-blogs/priv/assertions"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -34,14 +35,6 @@ func setupWebmentionTest(repo owl.Repository, user owl.User, target string, sour
 	return rr, nil
 }
 
-func assertStatus(t *testing.T, rr *httptest.ResponseRecorder, expStatus int) {
-	if status := rr.Code; status != expStatus {
-		t.Errorf("handler returned wrong status code: got %v want %v",
-			status, expStatus)
-		return
-	}
-}
-
 func TestWebmentionHandleAccepts(t *testing.T) {
 	repo := getTestRepo(owl.RepoConfig{})
 	user, _ := repo.CreateUser("test-1")
@@ -51,11 +44,9 @@ func TestWebmentionHandleAccepts(t *testing.T) {
 	source := "https://example.com"
 
 	rr, err := setupWebmentionTest(repo, user, target, source)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error setting up webmention test")
 
-	assertStatus(t, rr, http.StatusAccepted)
+	assertions.AssertStatus(t, rr, http.StatusAccepted)
 
 }
 
@@ -69,16 +60,10 @@ func TestWebmentionWrittenToPost(t *testing.T) {
 	source := "https://example.com"
 
 	rr, err := setupWebmentionTest(repo, user, target, source)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error setting up webmention test")
 
-	// Check the status code is what we expect.
-	assertStatus(t, rr, http.StatusAccepted)
-
-	if len(post.IncomingWebmentions()) != 1 {
-		t.Errorf("no webmention written to post")
-	}
+	assertions.AssertStatus(t, rr, http.StatusAccepted)
+	assertions.AssertLen(t, post.IncomingWebmentions(), 1)
 }
 
 //
@@ -98,11 +83,9 @@ func TestWebmentionSourceValidation(t *testing.T) {
 	source := "ftp://example.com"
 
 	rr, err := setupWebmentionTest(repo, user, target, source)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error setting up webmention test")
 
-	assertStatus(t, rr, http.StatusBadRequest)
+	assertions.AssertStatus(t, rr, http.StatusBadRequest)
 }
 
 func TestWebmentionTargetValidation(t *testing.T) {
@@ -115,11 +98,9 @@ func TestWebmentionTargetValidation(t *testing.T) {
 	source := post.FullUrl()
 
 	rr, err := setupWebmentionTest(repo, user, target, source)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error setting up webmention test")
 
-	assertStatus(t, rr, http.StatusBadRequest)
+	assertions.AssertStatus(t, rr, http.StatusBadRequest)
 }
 
 // The receiver MUST reject the request if the source URL is the same as the target URL.
@@ -134,11 +115,9 @@ func TestWebmentionSameTargetAndSource(t *testing.T) {
 	source := post.FullUrl()
 
 	rr, err := setupWebmentionTest(repo, user, target, source)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error setting up webmention test")
 
-	assertStatus(t, rr, http.StatusBadRequest)
+	assertions.AssertStatus(t, rr, http.StatusBadRequest)
 }
 
 // The receiver SHOULD check that target is a valid resource for which it can accept Webmentions.
@@ -154,11 +133,9 @@ func TestValidationOfTarget(t *testing.T) {
 	source := post.FullUrl()
 
 	rr, err := setupWebmentionTest(repo, user, target, source)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error setting up webmention test")
 
-	assertStatus(t, rr, http.StatusBadRequest)
+	assertions.AssertStatus(t, rr, http.StatusBadRequest)
 }
 
 func TestAcceptWebmentionForAlias(t *testing.T) {
@@ -179,9 +156,7 @@ func TestAcceptWebmentionForAlias(t *testing.T) {
 	source := "https://example.com"
 
 	rr, err := setupWebmentionTest(repo, user, target, source)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assertions.AssertNoError(t, err, "Error setting up webmention test")
 
-	assertStatus(t, rr, http.StatusAccepted)
+	assertions.AssertStatus(t, rr, http.StatusAccepted)
 }
diff --git a/post_test.go b/post_test.go
index cfbb8f4..98ebf3e 100644
--- a/post_test.go
+++ b/post_test.go
@@ -2,6 +2,7 @@ package owl_test
 
 import (
 	"h4kor/owl-blogs"
+	"h4kor/owl-blogs/priv/assertions"
 	"os"
 	"path"
 	"strconv"
@@ -121,9 +122,7 @@ func TestRawHTMLIfAllowedByRepo(t *testing.T) {
 	os.WriteFile(post.ContentFile(), []byte(content), 0644)
 	html := post.RenderedContent()
 	html_str := html.String()
-	if !strings.Contains(html_str, "<script>") {
-		t.Error("HTML should be allowed")
-	}
+	assertions.AssertContains(t, html_str, "<script>")
 }
 
 func TestLoadMeta(t *testing.T) {
@@ -144,25 +143,13 @@ func TestLoadMeta(t *testing.T) {
 
 	err := post.LoadMeta()
 
-	if err != nil {
-		t.Errorf("Got Error: %v", err)
-	}
+	assertions.AssertNoError(t, err, "Error loading meta")
 
-	if post.Meta().Title != "test" {
-		t.Errorf("Expected title: %s, got %s", "test", post.Meta().Title)
-	}
-
-	if len(post.Meta().Aliases) != 1 || post.Meta().Aliases[0] != "foo/bar/" {
-		t.Errorf("Expected title: %v, got %v", []string{"foo/bar/"}, post.Meta().Aliases)
-	}
-
-	if post.Meta().Date.Format(time.RFC1123Z) != "Wed, 17 Aug 2022 10:50:02 +0000" {
-		t.Errorf("Expected title: %s, got %s", "Wed, 17 Aug 2022 10:50:02 +0000", post.Meta().Title)
-	}
-
-	if post.Meta().Draft != true {
-		t.Errorf("Expected title: %v, got %v", true, post.Meta().Draft)
-	}
+	assertions.AssertEqual(t, post.Meta().Title, "test")
+	assertions.AssertLen(t, post.Meta().Aliases, 1)
+	assertions.AssertEqual(t, post.Meta().Draft, true)
+	assertions.AssertEqual(t, post.Meta().Date.Format(time.RFC1123Z), "Wed, 17 Aug 2022 10:50:02 +0000")
+	assertions.AssertEqual(t, post.Meta().Draft, true)
 }
 
 ///
@@ -177,17 +164,10 @@ func TestPersistIncomingWebmention(t *testing.T) {
 		Source: "http://example.com/source",
 	}
 	err := post.PersistIncomingWebmention(webmention)
-	if err != nil {
-		t.Errorf("Got error: %v", err)
-	}
+	assertions.AssertNoError(t, err, "Error persisting webmention")
 	mentions := post.IncomingWebmentions()
-	if len(mentions) != 1 {
-		t.Errorf("Expected 1 webmention, got %d", len(mentions))
-	}
-
-	if mentions[0].Source != webmention.Source {
-		t.Errorf("Expected source: %s, got %s", webmention.Source, mentions[0].Source)
-	}
+	assertions.AssertLen(t, mentions, 1)
+	assertions.AssertEqual(t, mentions[0].Source, webmention.Source)
 }
 
 func TestAddIncomingWebmentionCreatesFile(t *testing.T) {
@@ -198,14 +178,10 @@ func TestAddIncomingWebmentionCreatesFile(t *testing.T) {
 	post, _ := user.CreateNewPost("testpost", false)
 
 	err := post.AddIncomingWebmention("https://example.com")
-	if err != nil {
-		t.Errorf("Got Error: %v", err)
-	}
+	assertions.AssertNoError(t, err, "Error adding webmention")
 
 	mentions := post.IncomingWebmentions()
-	if len(mentions) != 1 {
-		t.Errorf("Expected 1 webmention, got %d", len(mentions))
-	}
+	assertions.AssertLen(t, mentions, 1)
 }
 
 func TestAddIncomingWebmentionNotOverwritingWebmention(t *testing.T) {
@@ -223,13 +199,9 @@ func TestAddIncomingWebmentionNotOverwritingWebmention(t *testing.T) {
 	post.AddIncomingWebmention("https://example.com")
 
 	mentions := post.IncomingWebmentions()
-	if len(mentions) != 1 {
-		t.Errorf("Expected 1 webmention, got %d", len(mentions))
-	}
+	assertions.AssertLen(t, mentions, 1)
 
-	if mentions[0].ApprovalStatus != "approved" {
-		t.Errorf("Expected approval status: %s, got %s", "approved", mentions[0].ApprovalStatus)
-	}
+	assertions.AssertEqual(t, mentions[0].ApprovalStatus, "approved")
 }
 
 func TestEnrichAddsTitle(t *testing.T) {
@@ -243,13 +215,8 @@ func TestEnrichAddsTitle(t *testing.T) {
 	post.EnrichWebmention(owl.WebmentionIn{Source: "https://example.com"})
 
 	mentions := post.IncomingWebmentions()
-	if len(mentions) != 1 {
-		t.Errorf("Expected 1 webmention, got %d", len(mentions))
-	}
-
-	if mentions[0].Title != "Mock Title" {
-		t.Errorf("Expected title: %s, got %s", "Mock Title", mentions[0].Title)
-	}
+	assertions.AssertLen(t, mentions, 1)
+	assertions.AssertEqual(t, mentions[0].Title, "Mock Title")
 }
 
 func TestApprovedIncomingWebmentions(t *testing.T) {
@@ -282,16 +249,10 @@ func TestApprovedIncomingWebmentions(t *testing.T) {
 	post.PersistIncomingWebmention(webmention)
 
 	webmentions := post.ApprovedIncomingWebmentions()
-	if len(webmentions) != 2 {
-		t.Errorf("Expected 2 webmentions, got %d", len(webmentions))
-	}
+	assertions.AssertLen(t, webmentions, 2)
 
-	if webmentions[0].Source != "http://example.com/source" {
-		t.Errorf("Expected source: %s, got %s", "http://example.com/source", webmentions[0].Source)
-	}
-	if webmentions[1].Source != "http://example.com/source3" {
-		t.Errorf("Expected source: %s, got %s", "http://example.com/source3", webmentions[1].Source)
-	}
+	assertions.AssertEqual(t, webmentions[0].Source, "http://example.com/source")
+	assertions.AssertEqual(t, webmentions[1].Source, "http://example.com/source3")
 
 }
 
@@ -310,12 +271,8 @@ func TestScanningForLinks(t *testing.T) {
 
 	post.ScanForLinks()
 	webmentions := post.OutgoingWebmentions()
-	if len(webmentions) != 1 {
-		t.Errorf("Expected 1 webmention, got %d", len(webmentions))
-	}
-	if webmentions[0].Target != "https://example.com/hello" {
-		t.Errorf("Expected target: %s, got %s", "https://example.com/hello", webmentions[0].Target)
-	}
+	assertions.AssertLen(t, webmentions, 1)
+	assertions.AssertEqual(t, webmentions[0].Target, "https://example.com/hello")
 }
 
 func TestScanningForLinksDoesNotAddDuplicates(t *testing.T) {
@@ -336,12 +293,8 @@ func TestScanningForLinksDoesNotAddDuplicates(t *testing.T) {
 	post.ScanForLinks()
 	post.ScanForLinks()
 	webmentions := post.OutgoingWebmentions()
-	if len(webmentions) != 1 {
-		t.Errorf("Expected 1 webmention, got %d", len(webmentions))
-	}
-	if webmentions[0].Target != "https://example.com/hello" {
-		t.Errorf("Expected target: %s, got %s", "https://example.com/hello", webmentions[0].Target)
-	}
+	assertions.AssertLen(t, webmentions, 1)
+	assertions.AssertEqual(t, webmentions[0].Target, "https://example.com/hello")
 }
 
 func TestScanningForLinksDoesAddReplyUrl(t *testing.T) {
@@ -361,12 +314,8 @@ func TestScanningForLinksDoesAddReplyUrl(t *testing.T) {
 
 	post.ScanForLinks()
 	webmentions := post.OutgoingWebmentions()
-	if len(webmentions) != 1 {
-		t.Errorf("Expected 1 webmention, got %d", len(webmentions))
-	}
-	if webmentions[0].Target != "https://example.com/reply" {
-		t.Errorf("Expected target: %s, got %s", "https://example.com/reply", webmentions[0].Target)
-	}
+	assertions.AssertLen(t, webmentions, 1)
+	assertions.AssertEqual(t, webmentions[0].Target, "https://example.com/reply")
 }
 
 func TestCanSendWebmention(t *testing.T) {
@@ -381,20 +330,12 @@ func TestCanSendWebmention(t *testing.T) {
 	}
 
 	err := post.SendWebmention(webmention)
-	if err != nil {
-		t.Errorf("Error sending webmention: %v", err)
-	}
+	assertions.AssertNoError(t, err, "Error sending webmention")
 
 	webmentions := post.OutgoingWebmentions()
 
-	if len(webmentions) != 1 {
-		t.Errorf("Expected 1 webmention, got %d", len(webmentions))
-	}
-
-	if webmentions[0].Target != "http://example.com" {
-		t.Errorf("Expected target: %s, got %s", "http://example.com", webmentions[0].Target)
-	}
-
+	assertions.AssertLen(t, webmentions, 1)
+	assertions.AssertEqual(t, webmentions[0].Target, "http://example.com")
 	if webmentions[0].LastSentAt.IsZero() {
 		t.Errorf("Expected LastSentAt to be set")
 	}
@@ -423,13 +364,8 @@ func TestSendWebmentionOnlyScansOncePerWeek(t *testing.T) {
 
 	webmentions = post.OutgoingWebmentions()
 
-	if len(webmentions) != 1 {
-		t.Errorf("Expected 1 webmention, got %d", len(webmentions))
-	}
-
-	if webmentions[0].ScannedAt != webmention.ScannedAt {
-		t.Errorf("Expected ScannedAt to be unchanged. Expected: %v, got %v", webmention.ScannedAt, webmentions[0].ScannedAt)
-	}
+	assertions.AssertLen(t, webmentions, 1)
+	assertions.AssertEqual(t, webmentions[0].ScannedAt, webmention.ScannedAt)
 }
 
 func TestSendingMultipleWebmentions(t *testing.T) {
@@ -456,9 +392,7 @@ func TestSendingMultipleWebmentions(t *testing.T) {
 
 	webmentions := post.OutgoingWebmentions()
 
-	if len(webmentions) != 20 {
-		t.Errorf("Expected 20 webmentions, got %d", len(webmentions))
-	}
+	assertions.AssertLen(t, webmentions, 20)
 }
 
 func TestReceivingMultipleWebmentions(t *testing.T) {
@@ -482,9 +416,7 @@ func TestReceivingMultipleWebmentions(t *testing.T) {
 
 	webmentions := post.IncomingWebmentions()
 
-	if len(webmentions) != 20 {
-		t.Errorf("Expected 20 webmentions, got %d", len(webmentions))
-	}
+	assertions.AssertLen(t, webmentions, 20)
 
 }
 
@@ -515,16 +447,10 @@ func TestSendingAndReceivingMultipleWebmentions(t *testing.T) {
 	wg.Wait()
 
 	ins := post.IncomingWebmentions()
-
-	if len(ins) != 20 {
-		t.Errorf("Expected 20 webmentions, got %d", len(ins))
-	}
-
 	outs := post.OutgoingWebmentions()
 
-	if len(outs) != 20 {
-		t.Errorf("Expected 20 webmentions, got %d", len(outs))
-	}
+	assertions.AssertLen(t, ins, 20)
+	assertions.AssertLen(t, outs, 20)
 }
 
 func TestComplexParallelWebmentions(t *testing.T) {
@@ -564,16 +490,10 @@ func TestComplexParallelWebmentions(t *testing.T) {
 	wg.Wait()
 
 	ins := post.IncomingWebmentions()
-
-	if len(ins) != 20 {
-		t.Errorf("Expected 20 webmentions, got %d", len(ins))
-	}
-
 	outs := post.OutgoingWebmentions()
 
-	if len(outs) != 20 {
-		t.Errorf("Expected 20 webmentions, got %d", len(outs))
-	}
+	assertions.AssertLen(t, ins, 20)
+	assertions.AssertLen(t, outs, 20)
 }
 
 // func TestComplexParallelSimulatedProcessesWebmentions(t *testing.T) {
diff --git a/priv/assertions/asserts.go b/priv/assertions/asserts.go
new file mode 100644
index 0000000..012cdb4
--- /dev/null
+++ b/priv/assertions/asserts.go
@@ -0,0 +1,50 @@
+package assertions
+
+import (
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func AssertContains(t *testing.T, containing string, search string) {
+	t.Helper()
+	if !strings.Contains(containing, search) {
+		t.Errorf("Expected '%s' to contain '%s'", containing, search)
+	}
+}
+
+func AssertNoError(t *testing.T, err error, message string) {
+	t.Helper()
+	if err != nil {
+		t.Errorf(message+": %s", err.Error())
+	}
+}
+
+func AssertLen[T any](t *testing.T, list []T, expected int) {
+	t.Helper()
+	if len(list) != expected {
+		t.Errorf("Expected list to have length %d, got %d", expected, len(list))
+	}
+}
+
+func AssertMapLen[T any, S comparable](t *testing.T, list map[S]T, expected int) {
+	t.Helper()
+	if len(list) != expected {
+		t.Errorf("Expected list to have length %d, got %d", expected, len(list))
+	}
+}
+
+func AssertEqual[T comparable](t *testing.T, actual T, expected T) {
+	t.Helper()
+	if actual != expected {
+		t.Errorf("Expected '%v', got '%v'", expected, actual)
+	}
+}
+
+func AssertStatus(t *testing.T, rr *httptest.ResponseRecorder, expStatus int) {
+	if status := rr.Code; status != expStatus {
+		t.Errorf("handler returned wrong status code: got %v want %v",
+			status, expStatus)
+		return
+	}
+}
diff --git a/renderer_test.go b/renderer_test.go
index 6068ec5..f3ae465 100644
--- a/renderer_test.go
+++ b/renderer_test.go
@@ -2,6 +2,7 @@ package owl_test
 
 import (
 	"h4kor/owl-blogs"
+	"h4kor/owl-blogs/priv/assertions"
 	"os"
 	"path"
 	"strings"
@@ -14,14 +15,8 @@ func TestCanRenderPost(t *testing.T) {
 	post, _ := user.CreateNewPost("testpost", false)
 	result, err := owl.RenderPost(post)
 
-	if err != nil {
-		t.Error("Error rendering post: " + err.Error())
-		return
-	}
-
-	if !strings.Contains(result, "<h1 class=\"p-name\">testpost</h1>") {
-		t.Error("Post title not rendered as h1. Got: " + result)
-	}
+	assertions.AssertNoError(t, err, "Error rendering post")
+	assertions.AssertContains(t, result, "testpost")
 
 }
 
@@ -37,14 +32,8 @@ func TestRenderOneMe(t *testing.T) {
 	post, _ := user.CreateNewPost("testpost", false)
 	result, err := owl.RenderPost(post)
 
-	if err != nil {
-		t.Error("Error rendering post: " + err.Error())
-		return
-	}
-
-	if !strings.Contains(result, "href=\"https://twitter.com/testhandle\" rel=\"me\"") {
-		t.Error("Twitter handle not rendered. Got: " + result)
-	}
+	assertions.AssertNoError(t, err, "Error rendering post")
+	assertions.AssertContains(t, result, "href=\"https://twitter.com/testhandle\" rel=\"me\"")
 
 }
 
@@ -64,17 +53,9 @@ func TestRenderTwoMe(t *testing.T) {
 	post, _ := user.CreateNewPost("testpost", false)
 	result, err := owl.RenderPost(post)
 
-	if err != nil {
-		t.Error("Error rendering post: " + err.Error())
-		return
-	}
-
-	if !strings.Contains(result, "href=\"https://twitter.com/testhandle\" rel=\"me\"") {
-		t.Error("Twitter handle not rendered. Got: " + result)
-	}
-	if !strings.Contains(result, "href=\"https://github.com/testhandle\" rel=\"me\"") {
-		t.Error("Github handle not rendered. Got: " + result)
-	}
+	assertions.AssertNoError(t, err, "Error rendering post")
+	assertions.AssertContains(t, result, "href=\"https://twitter.com/testhandle\" rel=\"me\"")
+	assertions.AssertContains(t, result, "href=\"https://github.com/testhandle\" rel=\"me\"")
 
 }
 
@@ -82,15 +63,9 @@ func TestRenderPostHEntry(t *testing.T) {
 	user := getTestUser()
 	post, _ := user.CreateNewPost("testpost", false)
 	result, _ := owl.RenderPost(post)
-	if !strings.Contains(result, "class=\"h-entry\"") {
-		t.Error("h-entry container not rendered. Got: " + result)
-	}
-	if !strings.Contains(result, "class=\"p-name\"") {
-		t.Error("p-name not rendered. Got: " + result)
-	}
-	if !strings.Contains(result, "class=\"e-content\"") {
-		t.Error("e-content not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "class=\"h-entry\"")
+	assertions.AssertContains(t, result, "class=\"p-name\"")
+	assertions.AssertContains(t, result, "class=\"e-content\"")
 
 }
 
@@ -99,14 +74,8 @@ func TestRendererUsesBaseTemplate(t *testing.T) {
 	post, _ := user.CreateNewPost("testpost", false)
 	result, err := owl.RenderPost(post)
 
-	if err != nil {
-		t.Error("Error rendering post: " + err.Error())
-		return
-	}
-
-	if !strings.Contains(result, "<html") {
-		t.Error("Base template not used. Got: " + result)
-	}
+	assertions.AssertNoError(t, err, "Error rendering post")
+	assertions.AssertContains(t, result, "<html")
 }
 
 func TestCanRenderIndexPage(t *testing.T) {
@@ -114,12 +83,8 @@ func TestCanRenderIndexPage(t *testing.T) {
 	user.CreateNewPost("testpost1", false)
 	user.CreateNewPost("testpost2", false)
 	result, _ := owl.RenderIndexPage(user)
-	if !strings.Contains(result, "testpost1") {
-		t.Error("Post title not rendered. Got: " + result)
-	}
-	if !strings.Contains(result, "testpost2") {
-		t.Error("Post title not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "testpost1")
+	assertions.AssertContains(t, result, "testpost2")
 }
 
 func TestIndexPageContainsHFeedContainer(t *testing.T) {
@@ -127,9 +92,7 @@ func TestIndexPageContainsHFeedContainer(t *testing.T) {
 	user.CreateNewPost("testpost1", false)
 
 	result, _ := owl.RenderIndexPage(user)
-	if !strings.Contains(result, "<div class=\"h-feed\">") {
-		t.Error("h-feed container not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "<div class=\"h-feed\">")
 }
 
 func TestIndexPageContainsHEntryAndUUrl(t *testing.T) {
@@ -137,12 +100,8 @@ func TestIndexPageContainsHEntryAndUUrl(t *testing.T) {
 	user.CreateNewPost("testpost1", false)
 
 	result, _ := owl.RenderIndexPage(user)
-	if !strings.Contains(result, "class=\"h-entry\"") {
-		t.Error("h-entry container not rendered. Got: " + result)
-	}
-	if !strings.Contains(result, "class=\"u-url\"") {
-		t.Error("u-url not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "class=\"h-entry\"")
+	assertions.AssertContains(t, result, "class=\"u-url\"")
 
 }
 
@@ -165,16 +124,9 @@ func TestRenderUserList(t *testing.T) {
 	repo.CreateUser("user2")
 
 	result, err := owl.RenderUserList(repo)
-	if err != nil {
-		t.Error("Error rendering user list: " + err.Error())
-	}
-
-	if !strings.Contains(result, "user1") {
-		t.Error("Post title not rendered. Got: " + result)
-	}
-	if !strings.Contains(result, "user2") {
-		t.Error("Post title not rendered. Got: " + result)
-	}
+	assertions.AssertNoError(t, err, "Error rendering user list")
+	assertions.AssertContains(t, result, "user1")
+	assertions.AssertContains(t, result, "user2")
 }
 
 func TestRendersHeaderTitle(t *testing.T) {
@@ -187,15 +139,9 @@ func TestRendersHeaderTitle(t *testing.T) {
 	post, _ := user.CreateNewPost("testpost", false)
 
 	result, _ := owl.RenderPost(post)
-	if !strings.Contains(result, "Test Title") {
-		t.Error("Header title not rendered. Got: " + result)
-	}
-	if !strings.Contains(result, "Test SubTitle") {
-		t.Error("Header subtitle not rendered. Got: " + result)
-	}
-	if !strings.Contains(result, "#ff1337") {
-		t.Error("Header color not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "Test Title")
+	assertions.AssertContains(t, result, "Test SubTitle")
+	assertions.AssertContains(t, result, "#ff1337")
 }
 
 func TestRenderPostIncludesRelToWebMention(t *testing.T) {
@@ -203,13 +149,9 @@ func TestRenderPostIncludesRelToWebMention(t *testing.T) {
 	post, _ := user.CreateNewPost("testpost", false)
 
 	result, _ := owl.RenderPost(post)
-	if !strings.Contains(result, "rel=\"webmention\"") {
-		t.Error("webmention rel not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "rel=\"webmention\"")
 
-	if !strings.Contains(result, "href=\""+user.WebmentionUrl()+"\"") {
-		t.Error("webmention href not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "href=\""+user.WebmentionUrl()+"\"")
 }
 
 func TestRenderPostAddsLinksToApprovedWebmention(t *testing.T) {
@@ -230,12 +172,8 @@ func TestRenderPostAddsLinksToApprovedWebmention(t *testing.T) {
 	post.PersistIncomingWebmention(webmention)
 
 	result, _ := owl.RenderPost(post)
-	if !strings.Contains(result, "http://example.com/source3") {
-		t.Error("webmention not rendered. Got: " + result)
-	}
-	if !strings.Contains(result, "Test Title") {
-		t.Error("webmention title not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "http://example.com/source3")
+	assertions.AssertContains(t, result, "Test Title")
 	if strings.Contains(result, "http://example.com/source4") {
 		t.Error("unapproved webmention rendered. Got: " + result)
 	}
@@ -258,13 +196,8 @@ func TestRenderIncludesFullUrl(t *testing.T) {
 	post, _ := user.CreateNewPost("testpost", false)
 	result, _ := owl.RenderPost(post)
 
-	if !strings.Contains(result, "class=\"u-url\"") {
-		t.Error("u-url not rendered. Got: " + result)
-	}
-	if !strings.Contains(result, post.FullUrl()) {
-		t.Error("Full url not rendered. Got: " + result)
-		t.Error("Expected: " + post.FullUrl())
-	}
+	assertions.AssertContains(t, result, "class=\"u-url\"")
+	assertions.AssertContains(t, result, post.FullUrl())
 }
 
 func TestAddAvatarIfExist(t *testing.T) {
@@ -272,9 +205,7 @@ func TestAddAvatarIfExist(t *testing.T) {
 	os.WriteFile(path.Join(user.MediaDir(), "avatar.png"), []byte("test"), 0644)
 
 	result, _ := owl.RenderIndexPage(user)
-	if !strings.Contains(result, "avatar.png") {
-		t.Error("Avatar not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "avatar.png")
 }
 
 func TestAuthorNameInPost(t *testing.T) {
@@ -288,9 +219,7 @@ func TestAuthorNameInPost(t *testing.T) {
 	post, _ := user.CreateNewPost("testpost", false)
 
 	result, _ := owl.RenderPost(post)
-	if !strings.Contains(result, "Test Author") {
-		t.Error("Author Name not included. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "Test Author")
 }
 
 func TestRenderReplyWithoutText(t *testing.T) {
@@ -309,9 +238,7 @@ func TestRenderReplyWithoutText(t *testing.T) {
 	os.WriteFile(post.ContentFile(), []byte(content), 0644)
 
 	result, _ := owl.RenderPost(post)
-	if !strings.Contains(result, "https://example.com/post") {
-		t.Error("Reply url not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "https://example.com/post")
 }
 
 func TestRenderReplyWithText(t *testing.T) {
@@ -330,13 +257,9 @@ func TestRenderReplyWithText(t *testing.T) {
 	os.WriteFile(post.ContentFile(), []byte(content), 0644)
 
 	result, _ := owl.RenderPost(post)
-	if !strings.Contains(result, "https://example.com/post") {
-		t.Error("Reply url not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "https://example.com/post")
 
-	if !strings.Contains(result, "This is a reply") {
-		t.Error("Reply text not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "This is a reply")
 }
 
 func TestOpenGraphTags(t *testing.T) {
@@ -351,28 +274,14 @@ func TestOpenGraphTags(t *testing.T) {
 	content += "\n"
 	content += "Hi \n"
 
-	err := os.WriteFile(post.ContentFile(), []byte(content), 0644)
-	if err != nil {
-		t.Error(err)
-	}
+	os.WriteFile(post.ContentFile(), []byte(content), 0644)
 	post, _ = user.GetPost(post.Id())
-
 	result, _ := owl.RenderPost(post)
 
-	if !strings.Contains(result, "<meta property=\"og:title\" content=\"The Rock\" />") {
-		t.Error("incorrent og:title . Got: " + result)
-	}
-
-	if !strings.Contains(result, "<meta property=\"og:description\" content=\"Dwayne Johnson\" />") {
-		t.Error("incorrent og:description . Got: " + result)
-	}
-
-	if !strings.Contains(result, "<meta property=\"og:type\" content=\"article\" />") {
-		t.Error("incorrent og:type . Got: " + result)
-	}
-	if !strings.Contains(result, "<meta property=\"og:url\" content=\""+post.FullUrl()+"\" />") {
-		t.Error("incorrent og:url . Got: " + result)
-	}
+	assertions.AssertContains(t, result, "<meta property=\"og:title\" content=\"The Rock\" />")
+	assertions.AssertContains(t, result, "<meta property=\"og:description\" content=\"Dwayne Johnson\" />")
+	assertions.AssertContains(t, result, "<meta property=\"og:type\" content=\"article\" />")
+	assertions.AssertContains(t, result, "<meta property=\"og:url\" content=\""+post.FullUrl()+"\" />")
 
 }
 
@@ -381,7 +290,5 @@ func TestAddFaviconIfExist(t *testing.T) {
 	os.WriteFile(path.Join(user.MediaDir(), "favicon.png"), []byte("test"), 0644)
 
 	result, _ := owl.RenderIndexPage(user)
-	if !strings.Contains(result, "favicon.png") {
-		t.Error("favicon not rendered. Got: " + result)
-	}
+	assertions.AssertContains(t, result, "favicon.png")
 }
diff --git a/repository_test.go b/repository_test.go
index e50632c..e87efad 100644
--- a/repository_test.go
+++ b/repository_test.go
@@ -2,6 +2,7 @@ package owl_test
 
 import (
 	"h4kor/owl-blogs"
+	"h4kor/owl-blogs/priv/assertions"
 	"os"
 	"path"
 	"testing"
@@ -10,9 +11,7 @@ import (
 func TestCanCreateRepository(t *testing.T) {
 	repoName := testRepoName()
 	_, err := owl.CreateRepository(repoName, owl.RepoConfig{})
-	if err != nil {
-		t.Error("Error creating repository: ", err.Error())
-	}
+	assertions.AssertNoError(t, err, "Error creating repository: ")
 
 }
 
@@ -88,9 +87,7 @@ func TestCanListRepoUsers(t *testing.T) {
 	user2, _ := repo.CreateUser(randomUserName())
 	// Create a new post
 	users, _ := repo.Users()
-	if len(users) != 2 {
-		t.Error("Wrong number of users returned, expected 2, got ", len(users))
-	}
+	assertions.AssertLen(t, users, 2)
 	for _, user := range users {
 		if user.Name() != user1.Name() && user.Name() != user2.Name() {
 			t.Error("User found: " + user.Name())
@@ -104,9 +101,7 @@ func TestCanOpenRepository(t *testing.T) {
 	repo, _ := owl.CreateRepository(repoName, owl.RepoConfig{})
 	// Open the repository
 	repo2, err := owl.OpenRepository(repoName)
-	if err != nil {
-		t.Error("Error opening repository: ", err.Error())
-	}
+	assertions.AssertNoError(t, err, "Error opening repository: ")
 	if repo2.Dir() != repo.Dir() {
 		t.Error("Repository directories do not match")
 	}
@@ -125,9 +120,7 @@ func TestGetUser(t *testing.T) {
 	user, _ := repo.CreateUser(randomUserName())
 	// Get the user
 	user2, err := repo.GetUser(user.Name())
-	if err != nil {
-		t.Error("Error getting user: ", err.Error())
-	}
+	assertions.AssertNoError(t, err, "Error getting user: ")
 	if user2.Name() != user.Name() {
 		t.Error("User names do not match")
 	}
@@ -171,9 +164,7 @@ func TestNewRepoGetsStaticFilesPicoCSSWithContent(t *testing.T) {
 	// Create a new user
 	repo := getTestRepo(owl.RepoConfig{})
 	file, err := os.Open(path.Join(repo.StaticDir(), "pico.min.css"))
-	if err != nil {
-		t.Error("Error opening pico.min.css")
-	}
+	assertions.AssertNoError(t, err, "Error opening pico.min.css")
 	// check that the file has content
 	stat, _ := file.Stat()
 	if stat.Size() == 0 {
@@ -194,9 +185,7 @@ func TestCanGetRepoTemplate(t *testing.T) {
 	repo := getTestRepo(owl.RepoConfig{})
 	// Get the user
 	template, err := repo.Template()
-	if err != nil {
-		t.Error("Error getting template: ", err.Error())
-	}
+	assertions.AssertNoError(t, err, "Error getting template: ")
 	if template == "" {
 		t.Error("Template not returned")
 	}
@@ -215,9 +204,7 @@ func TestCanOpenRepositoryInSingleUserMode(t *testing.T) {
 	repo, _ := owl.OpenRepository(repoName)
 
 	users, _ := repo.Users()
-	if len(users) != 1 {
-		t.Error("Wrong number of users returned, expected 1, got ", len(users))
-	}
+	assertions.AssertLen(t, users, 1)
 	if users[0].Name() != userName {
 		t.Error("User name does not match")
 	}
@@ -253,19 +240,12 @@ func TestCanGetMapWithAllPostAliases(t *testing.T) {
 	os.WriteFile(post.ContentFile(), []byte(content), 0644)
 
 	posts, _ := user.Posts()
-	if len(posts) != 1 {
-		t.Error("Wrong number of posts returned, expected 1, got ", len(posts))
-	}
+	assertions.AssertLen(t, posts, 1)
 
 	var aliases map[string]*owl.Post
 	aliases, err := repo.PostAliases()
-	if err != nil {
-		t.Error("Error getting post aliases: ", err.Error())
-	}
-	if len(aliases) != 2 {
-		t.Error("Wrong number of aliases returned, expected 2, got ", len(aliases))
-		t.Error("Aliases: ", aliases)
-	}
+	assertions.AssertNoError(t, err, "Error getting post aliases: ")
+	assertions.AssertMapLen(t, aliases, 2)
 	if aliases["/foo/bar"] == nil {
 		t.Error("Alias '/foo/bar' not found")
 	}
@@ -298,19 +278,12 @@ func TestAliasesHaveCorrectPost(t *testing.T) {
 	os.WriteFile(post2.ContentFile(), []byte(content), 0644)
 
 	posts, _ := user.Posts()
-	if len(posts) != 2 {
-		t.Error("Wrong number of posts returned, expected 1, got ", len(posts))
-	}
+	assertions.AssertLen(t, posts, 2)
 
 	var aliases map[string]*owl.Post
 	aliases, err := repo.PostAliases()
-	if err != nil {
-		t.Error("Error getting post aliases: ", err.Error())
-	}
-	if len(aliases) != 2 {
-		t.Error("Wrong number of aliases returned, expected 2, got ", len(aliases))
-		t.Error("Aliases: ", aliases)
-	}
+	assertions.AssertNoError(t, err, "Error getting post aliases: ")
+	assertions.AssertMapLen(t, aliases, 2)
 	if aliases["/foo/1"].Id() != post1.Id() {
 		t.Error("Alias '/foo/1' points to wrong post: ", aliases["/foo/1"].Id())
 	}
diff --git a/rss_test.go b/rss_test.go
index c049753..92584cf 100644
--- a/rss_test.go
+++ b/rss_test.go
@@ -2,8 +2,8 @@ package owl_test
 
 import (
 	"h4kor/owl-blogs"
+	"h4kor/owl-blogs/priv/assertions"
 	"os"
-	"strings"
 	"testing"
 )
 
@@ -14,16 +14,9 @@ func TestRenderRSSFeedMeta(t *testing.T) {
 		SubTitle: "Test SubTitle",
 	})
 	res, err := owl.RenderRSSFeed(user)
-	if err != nil {
-		t.Error("Error rendering RSS feed: " + err.Error())
-		return
-	}
-	if !strings.Contains(res, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>") {
-		t.Error("xml version not rendered. Got: " + res)
-	}
-	if !strings.Contains(res, "<rss version=\"2.0\">") {
-		t.Error("rss version not rendered. Got: " + res)
-	}
+	assertions.AssertNoError(t, err, "Error rendering RSS feed")
+	assertions.AssertContains(t, res, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>")
+	assertions.AssertContains(t, res, "<rss version=\"2.0\">")
 
 }
 
@@ -34,19 +27,10 @@ func TestRenderRSSFeedUserData(t *testing.T) {
 		SubTitle: "Test SubTitle",
 	})
 	res, err := owl.RenderRSSFeed(user)
-	if err != nil {
-		t.Error("Error rendering RSS feed: " + err.Error())
-		return
-	}
-	if !strings.Contains(res, "Test Title") {
-		t.Error("Title not rendered. Got: " + res)
-	}
-	if !strings.Contains(res, "Test SubTitle") {
-		t.Error("SubTitle not rendered. Got: " + res)
-	}
-	if !strings.Contains(res, "http://localhost:8080/user/") {
-		t.Error("SubTitle not rendered. Got: " + res)
-	}
+	assertions.AssertNoError(t, err, "Error rendering RSS feed")
+	assertions.AssertContains(t, res, "Test Title")
+	assertions.AssertContains(t, res, "Test SubTitle")
+	assertions.AssertContains(t, res, "http://localhost:8080/user/")
 }
 
 func TestRenderRSSFeedPostData(t *testing.T) {
@@ -61,19 +45,10 @@ func TestRenderRSSFeedPostData(t *testing.T) {
 	os.WriteFile(post.ContentFile(), []byte(content), 0644)
 
 	res, err := owl.RenderRSSFeed(user)
-	if err != nil {
-		t.Error("Error rendering RSS feed: " + err.Error())
-		return
-	}
-	if !strings.Contains(res, "Test Post") {
-		t.Error("Title not rendered. Got: " + res)
-	}
-	if !strings.Contains(res, post.FullUrl()) {
-		t.Error("SubTitle not rendered. Got: " + res)
-	}
-	if !strings.Contains(res, "Thu, 01 Jan 2015 00:00:00 +0000") {
-		t.Error("Date not rendered. Got: " + res)
-	}
+	assertions.AssertNoError(t, err, "Error rendering RSS feed")
+	assertions.AssertContains(t, res, "Test Post")
+	assertions.AssertContains(t, res, post.FullUrl())
+	assertions.AssertContains(t, res, "Thu, 01 Jan 2015 00:00:00 +0000")
 }
 
 func TestRenderRSSFeedPostDataWithoutDate(t *testing.T) {
@@ -87,14 +62,7 @@ func TestRenderRSSFeedPostDataWithoutDate(t *testing.T) {
 	os.WriteFile(post.ContentFile(), []byte(content), 0644)
 
 	res, err := owl.RenderRSSFeed(user)
-	if err != nil {
-		t.Error("Error rendering RSS feed: " + err.Error())
-		return
-	}
-	if !strings.Contains(res, "Test Post") {
-		t.Error("Title not rendered. Got: " + res)
-	}
-	if !strings.Contains(res, post.FullUrl()) {
-		t.Error("SubTitle not rendered. Got: " + res)
-	}
+	assertions.AssertNoError(t, err, "Error rendering RSS feed")
+	assertions.AssertContains(t, res, "Test Post")
+	assertions.AssertContains(t, res, post.FullUrl())
 }
diff --git a/user_test.go b/user_test.go
index b384741..768f66c 100644
--- a/user_test.go
+++ b/user_test.go
@@ -3,6 +3,7 @@ package owl_test
 import (
 	"fmt"
 	"h4kor/owl-blogs"
+	"h4kor/owl-blogs/priv/assertions"
 	"os"
 	"path"
 	"testing"
@@ -15,9 +16,7 @@ func TestCreateNewPostCreatesEntryInPublic(t *testing.T) {
 	// Create a new post
 	user.CreateNewPost("testpost", false)
 	files, err := os.ReadDir(path.Join(user.Dir(), "public"))
-	if err != nil {
-		t.Error("Error reading directory")
-	}
+	assertions.AssertNoError(t, err, "Error reading directory")
 	if len(files) < 1 {
 		t.Error("Post not created")
 	}
@@ -55,9 +54,7 @@ func TestCreateNewPostMultipleCalls(t *testing.T) {
 	user.CreateNewPost("testpost", false)
 	user.CreateNewPost("testpost", false)
 	files, err := os.ReadDir(path.Join(user.Dir(), "public"))
-	if err != nil {
-		t.Error("Error reading directory")
-	}
+	assertions.AssertNoError(t, err, "Error reading directory")
 	if len(files) < 3 {
 		t.Errorf("Only %d posts created", len(files))
 	}
@@ -72,12 +69,8 @@ func TestCanListUserPosts(t *testing.T) {
 	user.CreateNewPost("testpost", false)
 	user.CreateNewPost("testpost", false)
 	posts, err := user.Posts()
-	if err != nil {
-		t.Error("Error reading posts")
-	}
-	if len(posts) != 3 {
-		t.Error("No posts found")
-	}
+	assertions.AssertNoError(t, err, "Error reading posts")
+	assertions.AssertLen(t, posts, 3)
 }
 
 func TestCannotListUserPostsInSubdirectories(t *testing.T) {
@@ -162,9 +155,7 @@ func TestListUserPostsDoesNotIncludeDrafts(t *testing.T) {
 	os.WriteFile(post.ContentFile(), []byte(content), 0644)
 
 	posts, _ := user.Posts()
-	if len(posts) != 0 {
-		t.Error("Found draft post")
-	}
+	assertions.AssertLen(t, posts, 0)
 }
 
 func TestListUsersDraftsExcludedRealWorld(t *testing.T) {
@@ -190,9 +181,7 @@ func TestListUsersDraftsExcludedRealWorld(t *testing.T) {
 	os.WriteFile(post.ContentFile(), []byte(content), 0644)
 
 	posts, _ := user.Posts()
-	if len(posts) != 0 {
-		t.Error("Found draft post")
-	}
+	assertions.AssertLen(t, posts, 0)
 }
 
 func TestCanLoadPost(t *testing.T) {
@@ -320,9 +309,7 @@ func TestAvatarSetIfFileExist(t *testing.T) {
 func TestPostNameIllegalFileName(t *testing.T) {
 	user := getTestUser()
 	_, err := user.CreateNewPost("testpost?///", false)
-	if err != nil {
-		t.Error("Should not have failed")
-	}
+	assertions.AssertNoError(t, err, "Should not have failed")
 }
 
 func TestFaviconIfNotExist(t *testing.T) {
diff --git a/webmention_test.go b/webmention_test.go
index d8bf8e0..ab2fe6b 100644
--- a/webmention_test.go
+++ b/webmention_test.go
@@ -3,6 +3,7 @@ package owl_test
 import (
 	"bytes"
 	"h4kor/owl-blogs"
+	"h4kor/owl-blogs/priv/assertions"
 	"io"
 	"net/http"
 	"net/url"
@@ -28,12 +29,8 @@ func TestParseValidHEntry(t *testing.T) {
 	parser := &owl.OwlHtmlParser{}
 	entry, err := parser.ParseHEntry(&http.Response{Body: io.NopCloser(bytes.NewReader(html))})
 
-	if err != nil {
-		t.Errorf("Unable to parse feed: %v", err)
-	}
-	if entry.Title != "Foo" {
-		t.Errorf("Wrong Title. Expected %v, got %v", "Foo", entry.Title)
-	}
+	assertions.AssertNoError(t, err, "Unable to parse feed")
+	assertions.AssertEqual(t, entry.Title, "Foo")
 }
 
 func TestParseValidHEntryWithoutTitle(t *testing.T) {
@@ -41,12 +38,8 @@ func TestParseValidHEntryWithoutTitle(t *testing.T) {
 	parser := &owl.OwlHtmlParser{}
 	entry, err := parser.ParseHEntry(&http.Response{Body: io.NopCloser(bytes.NewReader(html))})
 
-	if err != nil {
-		t.Errorf("Unable to parse feed: %v", err)
-	}
-	if entry.Title != "" {
-		t.Errorf("Wrong Title. Expected %v, got %v", "Foo", entry.Title)
-	}
+	assertions.AssertNoError(t, err, "Unable to parse feed")
+	assertions.AssertEqual(t, entry.Title, "")
 }
 
 func TestGetWebmentionEndpointLink(t *testing.T) {
@@ -54,12 +47,9 @@ func TestGetWebmentionEndpointLink(t *testing.T) {
 	parser := &owl.OwlHtmlParser{}
 	endpoint, err := parser.GetWebmentionEndpoint(constructResponse(html))
 
-	if err != nil {
-		t.Errorf("Unable to parse feed: %v", err)
-	}
-	if endpoint != "http://example.com/webmention" {
-		t.Errorf("Wrong endpoint. Expected %v, got %v", "http://example.com/webmention", endpoint)
-	}
+	assertions.AssertNoError(t, err, "Unable to parse feed")
+
+	assertions.AssertEqual(t, endpoint, "http://example.com/webmention")
 }
 
 func TestGetWebmentionEndpointLinkA(t *testing.T) {
@@ -67,12 +57,8 @@ func TestGetWebmentionEndpointLinkA(t *testing.T) {
 	parser := &owl.OwlHtmlParser{}
 	endpoint, err := parser.GetWebmentionEndpoint(constructResponse(html))
 
-	if err != nil {
-		t.Errorf("Unable to parse feed: %v", err)
-	}
-	if endpoint != "http://example.com/webmention" {
-		t.Errorf("Wrong endpoint. Expected %v, got %v", "http://example.com/webmention", endpoint)
-	}
+	assertions.AssertNoError(t, err, "Unable to parse feed")
+	assertions.AssertEqual(t, endpoint, "http://example.com/webmention")
 }
 
 func TestGetWebmentionEndpointLinkAFakeWebmention(t *testing.T) {
@@ -80,12 +66,8 @@ func TestGetWebmentionEndpointLinkAFakeWebmention(t *testing.T) {
 	parser := &owl.OwlHtmlParser{}
 	endpoint, err := parser.GetWebmentionEndpoint(constructResponse(html))
 
-	if err != nil {
-		t.Errorf("Unable to parse feed: %v", err)
-	}
-	if endpoint != "http://example.com/webmention" {
-		t.Errorf("Wrong endpoint. Expected %v, got %v", "http://example.com/webmention", endpoint)
-	}
+	assertions.AssertNoError(t, err, "Unable to parse feed")
+	assertions.AssertEqual(t, endpoint, "http://example.com/webmention")
 }
 
 func TestGetWebmentionEndpointLinkHeader(t *testing.T) {
@@ -95,12 +77,8 @@ func TestGetWebmentionEndpointLinkHeader(t *testing.T) {
 	resp.Header = http.Header{"Link": []string{"<http://example.com/webmention>; rel=\"webmention\""}}
 	endpoint, err := parser.GetWebmentionEndpoint(resp)
 
-	if err != nil {
-		t.Errorf("Unable to parse feed: %v", err)
-	}
-	if endpoint != "http://example.com/webmention" {
-		t.Errorf("Wrong endpoint. Expected %v, got %v", "http://example.com/webmention", endpoint)
-	}
+	assertions.AssertNoError(t, err, "Unable to parse feed")
+	assertions.AssertEqual(t, endpoint, "http://example.com/webmention")
 }
 
 func TestGetWebmentionEndpointLinkHeaderCommas(t *testing.T) {
@@ -112,12 +90,8 @@ func TestGetWebmentionEndpointLinkHeaderCommas(t *testing.T) {
 	}
 	endpoint, err := parser.GetWebmentionEndpoint(resp)
 
-	if err != nil {
-		t.Errorf("Unable to parse feed: %v", err)
-	}
-	if endpoint != "https://webmention.rocks/test/19/webmention" {
-		t.Errorf("Wrong endpoint. Expected %v, got %v", "https://webmention.rocks/test/19/webmention", endpoint)
-	}
+	assertions.AssertNoError(t, err, "Unable to parse feed")
+	assertions.AssertEqual(t, endpoint, "https://webmention.rocks/test/19/webmention")
 }
 
 func TestGetWebmentionEndpointRelativeLink(t *testing.T) {
@@ -125,12 +99,8 @@ func TestGetWebmentionEndpointRelativeLink(t *testing.T) {
 	parser := &owl.OwlHtmlParser{}
 	endpoint, err := parser.GetWebmentionEndpoint(constructResponse(html))
 
-	if err != nil {
-		t.Errorf("Unable to parse feed: %v", err)
-	}
-	if endpoint != "http://example.com/webmention" {
-		t.Errorf("Wrong endpoint. Expected %v, got %v", "http://example.com/webmention", endpoint)
-	}
+	assertions.AssertNoError(t, err, "Unable to parse feed")
+	assertions.AssertEqual(t, endpoint, "http://example.com/webmention")
 }
 
 func TestGetWebmentionEndpointRelativeLinkInHeader(t *testing.T) {
@@ -140,12 +110,8 @@ func TestGetWebmentionEndpointRelativeLinkInHeader(t *testing.T) {
 	resp.Header = http.Header{"Link": []string{"</webmention>; rel=\"webmention\""}}
 	endpoint, err := parser.GetWebmentionEndpoint(resp)
 
-	if err != nil {
-		t.Errorf("Unable to parse feed: %v", err)
-	}
-	if endpoint != "http://example.com/webmention" {
-		t.Errorf("Wrong endpoint. Expected %v, got %v", "http://example.com/webmention", endpoint)
-	}
+	assertions.AssertNoError(t, err, "Unable to parse feed")
+	assertions.AssertEqual(t, endpoint, "http://example.com/webmention")
 }
 
 // func TestRealWorldWebmention(t *testing.T) {