Add iterator for DocumentMarker::MarkerTypes

third_party/WebKit/Source/core/editing/markers/DocumentMarkerTest.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/markers/DocumentMarker.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+class DocumentMarkerTest : public ::testing::Test {};
+
+TEST_F(DocumentMarkerTest, MarkerTypeIteratorEmpty) {
+  DocumentMarker::MarkerTypes types(0);
+  EXPECT_TRUE(types.begin() == types.end());
+}
+
+TEST_F(DocumentMarkerTest, MarkerTypeIteratorOne) {
+  DocumentMarker::MarkerTypes types(DocumentMarker::Spelling);
+  ASSERT_TRUE(types.begin() != types.end());
+  auto it = types.begin();
+  EXPECT_EQ(DocumentMarker::Spelling, *it);
+  ++it;
+  EXPECT_TRUE(it == types.end());
+}
+
+TEST_F(DocumentMarkerTest, MarkerTypeIteratorConsecutive) {
+  DocumentMarker::MarkerTypes types(0b11);  // Spelling | Grammar
+  ASSERT_TRUE(types.begin() != types.end());
+  auto it = types.begin();
+  EXPECT_EQ(DocumentMarker::Spelling, *it);
+  ++it;
+  EXPECT_EQ(DocumentMarker::Grammar, *it);
+  ++it;
+  EXPECT_TRUE(it == types.end());
+}
+
+TEST_F(DocumentMarkerTest, MarkerTypeIteratorDistributed) {
+  DocumentMarker::MarkerTypes types(0b101);  // Spelling | TextMatch
+  ASSERT_TRUE(types.begin() != types.end());
+  auto it = types.begin();
+  EXPECT_EQ(DocumentMarker::Spelling, *it);
+  ++it;
+  EXPECT_EQ(DocumentMarker::TextMatch, *it);
+  ++it;
+  EXPECT_TRUE(it == types.end());
+}
+}