Add SetCharacterDataCommand

third_party/WebKit/Source/core/editing/commands/SetCharacterDataCommandTest.cpp

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/editing/commands/SetCharacterDataCommand.h"
+
+#include "core/editing/EditingTestBase.h"
+#include "core/editing/commands/EditingState.h"
+
+namespace blink {
+
+class SetCharacterDataCommandTest : public EditingTestBase {};
+
+TEST_F(SetCharacterDataCommandTest, applyAndUnapply) {
+  setBodyContent("<div contenteditable>This is a good test case</div>");
+
+  SimpleEditCommand* command = SetCharacterDataCommand::create(
+      toText(document().body()->firstChild()->firstChild()), 10, 4, "lousy");
+
+  command->doReapply();
+  EXPECT_EQ("This is a lousy test case",
+            toText(document().body()->firstChild()->firstChild())->wholeText());
+
+  command->doUnapply();
+  EXPECT_EQ("This is a good test case",
+            toText(document().body()->firstChild()->firstChild())->wholeText());
+}

[yosin_UTC9, 2017/02/22 06:44:32]

Could you add edge cases?
- node.length=0 offset=count=0
- node.length>0 offset=node.length, count=0
- node.length>0 offset=0, count=node.length

Cases:
count == newText.length
count < newText.length
count > newText.length

+
+}  // namespace blink