test binding, add tests in form_test.go

binding/form_test.go

@@ -0,0 +1,64 @@
+// Copyright 2025 Gin Core Team. All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package binding
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFormBindings_Names(t *testing.T) {
+	assert.Equal(t, "form", Form.Name())
+	assert.Equal(t, "form-urlencoded", FormPost.Name())
+	assert.Equal(t, "multipart/form-data", FormMultipart.Name())
+}
+
+func TestFormBinding_BasicPost(t *testing.T) {
+	b := Form
+	obj := FooBarStruct{}
+	req := requestWithBody(http.MethodPost, "/", "foo=bar&bar=foo")
+	req.Header.Add("Content-Type", MIMEPOSTForm)
+	err := b.Bind(req, &obj)
+	require.NoError(t, err)
+	assert.Equal(t, "bar", obj.Foo)
+	assert.Equal(t, "foo", obj.Bar)
+}
+
+func TestFormPostBinding_Basic(t *testing.T) {
+	b := FormPost
+	obj := FooBarStruct{}
+	req := requestWithBody(http.MethodPost, "/", "foo=bar&bar=foo")
+	req.Header.Add("Content-Type", MIMEPOSTForm)
+	err := b.Bind(req, &obj)
+	require.NoError(t, err)
+	assert.Equal(t, "bar", obj.Foo)
+	assert.Equal(t, "foo", obj.Bar)
+}
+
+func TestFormMultipartBinding_BasicMultipart(t *testing.T) {
+	// reuse helper that exists in binding_test.go
+	req := createFormMultipartRequest(t)
+	var obj FooBarStruct
+	err := FormMultipart.Bind(req, &obj)
+	require.NoError(t, err)
+	assert.Equal(t, "bar", obj.Foo)
+	assert.Equal(t, "foo", obj.Bar)
+}
+
+// ensure that a non-multipart POST with form content still binds with Form (ParseMultipartForm should be ignored)
+func TestFormBinding_NonMultipartPostIgnoresMultipartError(t *testing.T) {
+	b := Form
+	obj := FooBarStruct{}
+	req := requestWithBody(http.MethodPost, "/", "foo=bar&bar=foo")
+	// Intentionally do not set multipart content-type so ParseMultipartForm returns ErrNotMultipart and is ignored
+	req.Header.Add("Content-Type", MIMEPOSTForm)
+	err := b.Bind(req, &obj)
+	require.NoError(t, err)
+	assert.Equal(t, "bar", obj.Foo)
+	assert.Equal(t, "foo", obj.Bar)
+}