Index: net/tools/transport_security_state_generator/bit_writer_unittest.cc |
diff --git a/net/tools/transport_security_state_generator/bit_writer_unittest.cc b/net/tools/transport_security_state_generator/bit_writer_unittest.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..8d8a03246a2cda1a9defbdb97f57a15686601c55 |
--- /dev/null |
+++ b/net/tools/transport_security_state_generator/bit_writer_unittest.cc |
@@ -0,0 +1,117 @@ |
+// 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 "net/tools/transport_security_state_generator/bit_writer.h" |
+#include "testing/gmock/include/gmock/gmock.h" |
+#include "testing/gtest/include/gtest/gtest.h" |
+ |
+namespace net { |
+ |
+namespace transport_security_state { |
+ |
+namespace { |
+ |
+// Test that single bits are written to the buffer correctly. |
+TEST(BitWriterTest, WriteBit) { |
+ BitWriter writer; |
+ |
+ EXPECT_EQ(0U, writer.position()); |
+ EXPECT_EQ(0U, writer.bytes().size()); |
+ |
+ writer.WriteBit(0); |
+ |
+ EXPECT_EQ(1U, writer.position()); |
+ |
+ writer.WriteBit(1); |
+ writer.WriteBit(0); |
+ writer.WriteBit(1); |
+ writer.WriteBit(0); |
+ writer.WriteBit(1); |
+ writer.WriteBit(0); |
+ writer.WriteBit(1); |
+ |
+ EXPECT_EQ(8U, writer.position()); |
+ |
+ writer.WriteBit(0); |
+ |
+ EXPECT_EQ(9U, writer.position()); |
+ |
+ writer.WriteBit(1); |
+ writer.WriteBit(0); |
+ |
+ EXPECT_EQ(11U, writer.position()); |
+ |
+ // Flush should pad the current byte with zero's until it's full. |
+ writer.Flush(); |
+ |
+ // The writer should have 2 bytes now even though we only wrote 11 bits. |
+ EXPECT_EQ(16U, writer.position()); |
+ |
+ // 0 + 1 + 0 + 1 + 0 + 1 + 0 + 1 + 0 + 1 + 0 + 00000 (padding) = 0x5540. |
+ EXPECT_THAT(writer.bytes(), testing::ElementsAre(0x55, 0x40)); |
+} |
+ |
+// Test that when multiple bits are written to the buffer, they are appended |
+// correctly. |
+TEST(BitWriterTest, WriteBits) { |
+ BitWriter writer; |
+ |
+ // 0xAA is 10101010 in binary. WritBits will write the n least significant |
+ // bits where n is given as the second parameter. |
+ writer.WriteBits(0xAA, 1); |
+ EXPECT_EQ(1U, writer.position()); |
+ writer.WriteBits(0xAA, 2); |
+ EXPECT_EQ(3U, writer.position()); |
+ writer.WriteBits(0xAA, 3); |
+ EXPECT_EQ(6U, writer.position()); |
+ writer.WriteBits(0xAA, 2); |
+ EXPECT_EQ(8U, writer.position()); |
+ writer.WriteBits(0xAA, 2); |
+ EXPECT_EQ(10U, writer.position()); |
+ |
+ // Flush should pad the current byte with zero's until it's full. |
+ writer.Flush(); |
+ |
+ // The writer should have 2 bytes now even though we only wrote 10 bits. |
+ EXPECT_EQ(16U, writer.position()); |
+ |
+ // 0 + 10 + 010 + 10 + 10 + 000000 (padding) = 0x4A80 |
+ EXPECT_THAT(writer.bytes(), testing::ElementsAre(0x4A, 0x80)); |
+} |
+ |
+// Test that buffering works correct when the methods are mixed. |
+TEST(BitWriterTest, WriteBoth) { |
+ BitWriter writer; |
+ |
+ // 0xAA is 10101010 in binary. WritBits will write the n least significant |
+ // bits where n is given as the second parameter. |
+ writer.WriteBits(0xAA, 1); |
+ EXPECT_EQ(1U, writer.position()); |
+ writer.WriteBit(1); |
+ writer.WriteBits(0xAA, 2); |
+ EXPECT_EQ(4U, writer.position()); |
+ writer.WriteBits(0xAA, 3); |
+ EXPECT_EQ(7U, writer.position()); |
+ writer.WriteBit(1); |
+ EXPECT_EQ(8U, writer.position()); |
+ |
+ writer.WriteBits(0xAA, 2); |
+ writer.WriteBit(0); |
+ EXPECT_EQ(11U, writer.position()); |
+ |
+ // Flush should pad the current byte with zero's until it's full. |
+ writer.Flush(); |
+ |
+ // The writer should have 2 bytes now even though we only wrote 10 bits. |
+ EXPECT_EQ(16U, writer.position()); |
+ |
+ // 0 + 1 + 10 + 010 + 1 + 10 + 0 + 00000 (padding) = 0x6580 |
+ EXPECT_THAT(writer.bytes(), testing::ElementsAre(0x65, 0x80)); |
+} |
+ |
+} // namespace |
+ |
+} // namespace transport_security_state |
+ |
+} // namespace net |