TextRenderer only pushes new cues downstream

media/base/text_ranges_unittest.cc

Index: media/base/text_ranges_unittest.cc
diff --git a/media/base/text_ranges_unittest.cc b/media/base/text_ranges_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4a207645007b22e71695c64c8de9229db97b1268
--- /dev/null
+++ b/media/base/text_ranges_unittest.cc
@@ -0,0 +1,147 @@
+// Copyright (c) 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 "media/base/text_ranges.h"
+
+#include "base/time/time.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+class TextRangesTest : public ::testing::Test {
+ protected:
+  bool AddCue(int seconds) {
+    return ranges_.AddCue(base::TimeDelta::FromSeconds(seconds));
+  }
+
+  void Reset() {
+    ranges_.Reset();
+  }
+
+  size_t RangeCount() {
+    return ranges_.RangeCountForTesting();
+  }
+
+  TextRanges ranges_;
+};
+
+TEST_F(TextRangesTest, TestEmptyRanges) {
+  // Create a new active range, with t=5.
+  EXPECT_TRUE(AddCue(5));
+
+  // Create a new active range, with t=2.
+  Reset();
+  EXPECT_TRUE(AddCue(2));
+
+  // Create a new active range, with t=8.
+  Reset();
+  EXPECT_TRUE(AddCue(8));
+
+  Reset();
+
+  // Make range [2, 2] active.
+  EXPECT_FALSE(AddCue(2));
+  EXPECT_EQ(RangeCount(), 3U);
+
+  // Coalesce first two ranges: [2, 5].
+  EXPECT_FALSE(AddCue(5));
+  EXPECT_EQ(RangeCount(), 2U);
+
+  // Coalesce first two ranges: [2, 8].
+  EXPECT_FALSE(AddCue(8));
+  EXPECT_EQ(RangeCount(), 1U);
+
+  // Add new cue to end of (only) range.
+  EXPECT_TRUE(AddCue(9));
+  EXPECT_EQ(RangeCount(), 1U);
+}
+
+TEST_F(TextRangesTest, TestOneRange) {
+  // Create a new active range, with t=0.
+  EXPECT_TRUE(AddCue(0));
+
+  // Add cues to end of existing range.
+  EXPECT_TRUE(AddCue(1));
+  EXPECT_TRUE(AddCue(4));
+
+  Reset();
+  EXPECT_FALSE(AddCue(2));
+  EXPECT_FALSE(AddCue(3));
+  EXPECT_FALSE(AddCue(4));
+}
+
+TEST_F(TextRangesTest, TestDuplicateLast) {
+  // Create a new active range, with t=0.
+  EXPECT_TRUE(AddCue(0));
+  EXPECT_TRUE(AddCue(1));
+
+  Reset();
+  EXPECT_FALSE(AddCue(1));
+  EXPECT_TRUE(AddCue(1));
+}
+
+TEST_F(TextRangesTest, TestTwoRanges) {
+  // Create a new active range, with t=0.
+  EXPECT_TRUE(AddCue(0));
+
+  // Add cue to end of existing range.
+  EXPECT_TRUE(AddCue(2));
+
+  Reset();
+
+  // Create a new active range, with t=4.
+  EXPECT_TRUE(AddCue(4));
+
+  // Add a new cue to end of last (active) range.
+  EXPECT_TRUE(AddCue(5));
+
+  Reset();
+
+  // Make first range active.
+  EXPECT_FALSE(AddCue(0));
+  EXPECT_FALSE(AddCue(2));
+
+  // Expand first range.
+  EXPECT_TRUE(AddCue(3));
+
+  // Coalesce first and second ranges.
+  EXPECT_FALSE(AddCue(4));
+  EXPECT_EQ(RangeCount(), 1U);
+}
+
+TEST_F(TextRangesTest, TestThreeRanges) {
+  // Create a new active range, with t=0.
+  EXPECT_TRUE(AddCue(0));
+
+  // Add cue to end of existing range.
+  EXPECT_TRUE(AddCue(2));
+
+  Reset();
+
+  // Create a new active range, with t=4.
+  EXPECT_TRUE(AddCue(4));
+
+  // Add a new cue to end of last (active) range.
+  EXPECT_TRUE(AddCue(5));
+
+  Reset();
+
+  // Create a new active range, in between the other two.
+  EXPECT_TRUE(AddCue(3));
+
+  // Coalesce middle and last ranges.
+  EXPECT_FALSE(AddCue(4));
+
+  Reset();
+
+  // Make first range active.
+  EXPECT_FALSE(AddCue(0));
+  EXPECT_FALSE(AddCue(2));
+
+  // Coalesce first and last ranges.
+  EXPECT_FALSE(AddCue(3));
+  EXPECT_EQ(RangeCount(), 1U);
+}
+
+}  // namespace media