diff --git a/app_test.go b/app_test.go
index fcb623bd..d186193a 100644
--- a/app_test.go
+++ b/app_test.go
@@ -1378,7 +1378,8 @@ func Test_App_New_Test_Parallel(t *testing.T) {
 	t.Run("Test_App_New_Test_Parallel_2", func(t *testing.T) {
 		t.Parallel()
 		app := New(Config{Immutable: true})
-		app.Test(httptest.NewRequest("GET", "/", nil))
+		_, err := app.Test(httptest.NewRequest("GET", "/", nil))
+		utils.AssertEqual(t, nil, err)
 	})
 }
 
diff --git a/ctx_test.go b/ctx_test.go
index 31f47e7a..caf03787 100644
--- a/ctx_test.go
+++ b/ctx_test.go
@@ -755,35 +755,42 @@ func Test_Ctx_Format(t *testing.T) {
 	c := app.AcquireCtx(&fasthttp.RequestCtx{})
 	defer app.ReleaseCtx(c)
 	c.Request().Header.Set(HeaderAccept, MIMETextPlain)
-	c.Format([]byte("Hello, World!"))
+	err := c.Format([]byte("Hello, World!"))
+	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "Hello, World!", string(c.Response().Body()))
 
 	c.Request().Header.Set(HeaderAccept, MIMETextHTML)
-	c.Format("Hello, World!")
+	err = c.Format("Hello, World!")
+	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "<p>Hello, World!</p>", string(c.Response().Body()))
 
 	c.Request().Header.Set(HeaderAccept, MIMEApplicationJSON)
-	c.Format("Hello, World!")
+	err = c.Format("Hello, World!")
+	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, `"Hello, World!"`, string(c.Response().Body()))
 
 	c.Request().Header.Set(HeaderAccept, MIMETextPlain)
-	c.Format(complex(1, 1))
+	err = c.Format(complex(1, 1))
+	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "(1+1i)", string(c.Response().Body()))
 
 	c.Request().Header.Set(HeaderAccept, MIMEApplicationXML)
-	c.Format("Hello, World!")
+	err = c.Format("Hello, World!")
+	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, `<string>Hello, World!</string>`, string(c.Response().Body()))
 
-	err := c.Format(complex(1, 1))
+	err = c.Format(complex(1, 1))
 	utils.AssertEqual(t, true, err != nil)
 
 	c.Request().Header.Set(HeaderAccept, MIMETextPlain)
-	c.Format(Map{})
+	err = c.Format(Map{})
+	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, "map[]", string(c.Response().Body()))
 
 	type broken string
 	c.Request().Header.Set(HeaderAccept, "broken/accept")
-	c.Format(broken("Hello, World!"))
+	err = c.Format(broken("Hello, World!"))
+	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, `Hello, World!`, string(c.Response().Body()))
 }
 
@@ -3137,8 +3144,8 @@ func Test_Ctx_Get_Location_From_Route_name(t *testing.T) {
 		utils.AssertEqual(t, nil, err)
 		utils.AssertEqual(t, "/user/fiber", location)
 	})
-	
-	t.Run("case sensitive",func(t *testing.T) {
+
+	t.Run("case sensitive", func(t *testing.T) {
 		app := New(Config{CaseSensitive: true})
 		c := app.AcquireCtx(&fasthttp.RequestCtx{})
 		defer app.ReleaseCtx(c)
diff --git a/helpers_test.go b/helpers_test.go
index e72e7272..03c1e687 100644
--- a/helpers_test.go
+++ b/helpers_test.go
@@ -84,7 +84,8 @@ func Test_Utils_ETag_Weak(t *testing.T) {
 	t.Run("Match Weak ETag", func(t *testing.T) {
 		c := app.AcquireCtx(&fasthttp.RequestCtx{})
 		defer app.ReleaseCtx(c)
-		c.SendString("Hello, World!")
+		err := c.SendString("Hello, World!")
+		utils.AssertEqual(t, nil, err)
 		c.Request().Header.Set(HeaderIfNoneMatch, `W/"13-1831710635"`)
 		setETag(c, true)
 		utils.AssertEqual(t, 304, c.Response().StatusCode())
@@ -95,7 +96,8 @@ func Test_Utils_ETag_Weak(t *testing.T) {
 	t.Run("Not Match Weak ETag", func(t *testing.T) {
 		c := app.AcquireCtx(&fasthttp.RequestCtx{})
 		defer app.ReleaseCtx(c)
-		c.SendString("Hello, World!")
+		err := c.SendString("Hello, World!")
+		utils.AssertEqual(t, nil, err)
 		c.Request().Header.Set(HeaderIfNoneMatch, `W/"13-1831710635xx"`)
 		setETag(c, true)
 		utils.AssertEqual(t, `W/"13-1831710635"`, string(c.Response().Header.Peek(HeaderETag)))
@@ -135,7 +137,8 @@ func Benchmark_Utils_ETag_Weak(b *testing.B) {
 	app := New()
 	c := app.AcquireCtx(&fasthttp.RequestCtx{})
 	defer app.ReleaseCtx(c)
-	c.SendString("Hello, World!")
+	err := c.SendString("Hello, World!")
+	utils.AssertEqual(b, nil, err)
 	for n := 0; n < b.N; n++ {
 		setETag(c, true)
 	}