Add FakeClipboard implementation for unit tests.

ui/base/clipboard/clipboard_android_unittest.cc

Index: ui/base/clipboard/clipboard_android_unittest.cc
diff --git a/ui/base/clipboard/clipboard_android_unittest.cc b/ui/base/clipboard/clipboard_android_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..41ce5526c752c9bbe8991f1ec1625ef944fb0357
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+++ b/ui/base/clipboard/clipboard_android_unittest.cc
@@ -0,0 +1,91 @@
+// Copyright 2014 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 "ui/base/clipboard/clipboard_android.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/base/clipboard/scoped_clipboard_writer.h"
+
+namespace ui {
+
+class ClipboardAndroidTest : public ::testing::Test {
+ public:
+  ~ClipboardAndroidTest() override {
+    Clipboard::DestroyClipboardForCurrentThread();
+  };
+
+ protected:
+  Clipboard& clipboard() { return *Clipboard::GetForCurrentThread(); }
+};
+
+// Test that if another application writes some text to the pasteboard the
+// clipboard properly invalidates other types.
+TEST_F(ClipboardAndroidTest, InternalClipboardInvalidation) {
+  // Write a Webkit smart paste tag to our clipboard.
+  {
+    ScopedClipboardWriter clipboard_writer(CLIPBOARD_TYPE_COPY_PASTE);
+    clipboard_writer.WriteWebSmartPaste();
+  }
+  EXPECT_TRUE(clipboard().IsFormatAvailable(
+      Clipboard::GetWebKitSmartPasteFormatType(), CLIPBOARD_TYPE_COPY_PASTE));
+
+  //
+  // Simulate that another application copied something in the Clipboard
+  //
+  std::string new_value("Some text copied by some other app");
+  using base::android::ConvertUTF8ToJavaString;
+  using base::android::MethodID;
+  using base::android::ScopedJavaLocalRef;
+
+  JNIEnv* env = base::android::AttachCurrentThread();
+  ASSERT_TRUE(env);
+
+  jobject context = base::android::GetApplicationContext();
+  ASSERT_TRUE(context);
+
+  ScopedJavaLocalRef<jclass> context_class =
+      base::android::GetClass(env, "android/content/Context");
+
+  jmethodID get_system_service = MethodID::Get<MethodID::TYPE_INSTANCE>(
+      env, context_class.obj(), "getSystemService",
+      "(Ljava/lang/String;)Ljava/lang/Object;");
+
+  // Retrieve the system service.
+  ScopedJavaLocalRef<jstring> service_name =
+      ConvertUTF8ToJavaString(env, "clipboard");
+  ScopedJavaLocalRef<jobject> clipboard_manager(
+      env,
+      env->CallObjectMethod(context, get_system_service, service_name.obj()));
+  ASSERT_TRUE(clipboard_manager.obj() && !base::android::ClearException(env));
+
+  ScopedJavaLocalRef<jclass> clipboard_class =
+      base::android::GetClass(env, "android/text/ClipboardManager");
+  jmethodID set_text = MethodID::Get<MethodID::TYPE_INSTANCE>(
+      env, clipboard_class.obj(), "setText", "(Ljava/lang/CharSequence;)V");
+  ScopedJavaLocalRef<jstring> new_value_string =
+      ConvertUTF8ToJavaString(env, new_value.c_str());
+
+  // Will need to call toString as CharSequence is not always a String.
+  env->CallVoidMethod(clipboard_manager.obj(), set_text,
+                      new_value_string.obj());
+
+  // The WebKit smart paste tag should now be gone.
+  EXPECT_FALSE(clipboard().IsFormatAvailable(
+      Clipboard::GetWebKitSmartPasteFormatType(), CLIPBOARD_TYPE_COPY_PASTE));
+
+  // Make sure some text is available
+  EXPECT_TRUE(clipboard().IsFormatAvailable(
+      Clipboard::GetPlainTextWFormatType(), CLIPBOARD_TYPE_COPY_PASTE));
+
+  // Make sure the text is what we inserted while simulating the other app
+  std::string contents;
+  clipboard().ReadAsciiText(CLIPBOARD_TYPE_COPY_PASTE, &contents);
+  EXPECT_EQ(contents, new_value);
+}
+
+}  // namespace ui
+
+#include "ui/base/clipboard/clipboard_test_template.h"