Fix 'errcheck' linter warnings (#2093)

binding/binding_test.go

@@ -441,7 +441,8 @@ func createFormFilesMultipartRequest(t *testing.T) *http.Request {
 	defer f.Close()
 	fw, err1 := mw.CreateFormFile("file", "form.go")
 	assert.NoError(t, err1)
-	io.Copy(fw, f)
+	_, err = io.Copy(fw, f)
+	assert.NoError(t, err)
 
 	req, err2 := http.NewRequest("POST", "/?foo=getfoo&bar=getbar", body)
 	assert.NoError(t, err2)
@@ -465,7 +466,8 @@ func createFormFilesMultipartRequestFail(t *testing.T) *http.Request {
 	defer f.Close()
 	fw, err1 := mw.CreateFormFile("file_foo", "form_foo.go")
 	assert.NoError(t, err1)
-	io.Copy(fw, f)
+	_, err = io.Copy(fw, f)
+	assert.NoError(t, err)
 
 	req, err2 := http.NewRequest("POST", "/?foo=getfoo&bar=getbar", body)
 	assert.NoError(t, err2)
@@ -554,7 +556,8 @@ func TestBindingFormPostForMapFail(t *testing.T) {
 func TestBindingFormFilesMultipart(t *testing.T) {
 	req := createFormFilesMultipartRequest(t)
 	var obj FooBarFileStruct
-	FormMultipart.Bind(req, &obj)
+	err := FormMultipart.Bind(req, &obj)
+	assert.NoError(t, err)
 
 	// file from os
 	f, _ := os.Open("form.go")

binding/form_mapping_benchmark_test.go

@@ -32,7 +32,10 @@ type structFull struct {
 func BenchmarkMapFormFull(b *testing.B) {
 	var s structFull
 	for i := 0; i < b.N; i++ {
-		mapForm(&s, form)
+		err := mapForm(&s, form)
+		if err != nil {
+			b.Fatalf("Error on a form mapping")
+		}
 	}
 	b.StopTimer()
 
@@ -52,7 +55,10 @@ type structName struct {
 func BenchmarkMapFormName(b *testing.B) {
 	var s structName
 	for i := 0; i < b.N; i++ {
-		mapForm(&s, form)
+		err := mapForm(&s, form)
+		if err != nil {
+			b.Fatalf("Error on a form mapping")
+		}
 	}
 	b.StopTimer()
 

gin.go

@@ -320,7 +320,10 @@ func (engine *Engine) RunUnix(file string) (err error) {
 		return
 	}
 	defer listener.Close()
-	os.Chmod(file, 0777)
+	err = os.Chmod(file, 0777)
+	if err != nil {
+		return
+	}
 	err = http.Serve(listener, engine)
 	return
 }

gin_integration_test.go

@@ -90,7 +90,8 @@ func TestPusher(t *testing.T) {
 	go func() {
 		router.GET("/pusher", func(c *Context) {
 			if pusher := c.Writer.Pusher(); pusher != nil {
-				pusher.Push("/assets/app.js", nil)
+				err := pusher.Push("/assets/app.js", nil)
+				assert.NoError(t, err)
 			}
 			c.String(http.StatusOK, "it worked")
 		})
@@ -239,6 +240,7 @@ func TestBadListener(t *testing.T) {
 	addr, err := net.ResolveTCPAddr("tcp", "localhost:10086")
 	assert.NoError(t, err)
 	listener, err := net.ListenTCP("tcp", addr)
+	assert.NoError(t, err)
 	listener.Close()
 	assert.Error(t, router.RunListener(listener))
 }

render/render_test.go

@@ -347,7 +347,10 @@ func TestRenderRedirect(t *testing.T) {
 	}
 
 	w = httptest.NewRecorder()
-	assert.PanicsWithValue(t, "Cannot redirect with status code 200", func() { data2.Render(w) })
+	assert.PanicsWithValue(t, "Cannot redirect with status code 200", func() {
+		err := data2.Render(w)
+		assert.NoError(t, err)
+	})
 
 	data3 := Redirect{
 		Code:     http.StatusCreated,