New test infrastructure for producing verbose logs in failing tests.

chrome/test/base/mof_data_parser_test_win.cc

+// Copyright (c) 2012 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 <vector>
+
+#include "base/basictypes.h"
+#include "chrome/test/base/mof_data_parser_win.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+// A test fixture for Mof parser tests.
+class MofDataParserTest : public ::testing::Test {

[Paweł Hajdan Jr., 2012/03/09 18:12:12]

nit: Could you just rename the file to say unittest instead of test?

[grt (UTC plus 2), 2012/03/09 20:38:58]

Done.

+ protected:
+  EVENT_TRACE* MakeEventWithDataOfSize(size_t size);
+  template<typename T> EVENT_TRACE* MakeEventWithBlittedValue(T value) {
+    EVENT_TRACE* event = MakeEventWithDataOfSize(sizeof(value));
+    *reinterpret_cast<T*>(event->MofData) = value;
+    return event;
+  }
+  EVENT_TRACE* MakeEventWithDWORD(DWORD value);
+  EVENT_TRACE* MakeEventWithPointerArray(const void* const* pointers,
+                                         DWORD size);
+  EVENT_TRACE* MakeEventWithString(const char* a_string, size_t length);
+
+  std::vector<uint8> buffer_;
+};
+
+EVENT_TRACE* MofDataParserTest::MakeEventWithDataOfSize(size_t size) {
+  buffer_.assign(sizeof(EVENT_TRACE) + size, 0);
+  EVENT_TRACE* event = reinterpret_cast<EVENT_TRACE*>(&buffer_[0]);
+  event->MofLength = size;
+  event->MofData = &buffer_[sizeof(EVENT_TRACE)];
+  return event;
+}
+
+EVENT_TRACE* MofDataParserTest::MakeEventWithDWORD(DWORD value) {
+  return MakeEventWithBlittedValue(value);
+}
+
+EVENT_TRACE* MofDataParserTest::MakeEventWithPointerArray(
+    const void* const* pointers,
+    DWORD size) {
+  EVENT_TRACE* event =
+      MakeEventWithDataOfSize(sizeof(DWORD) + sizeof(*pointers) * size);
+  *reinterpret_cast<DWORD*>(event->MofData) = size;
+  ::memcpy(reinterpret_cast<DWORD*>(event->MofData) + 1, pointers,
+           sizeof(*pointers) * size);
+  return event;
+}
+
+// |length| is the number of bytes to put in (i.e., include the terminator if
+// you want one).
+EVENT_TRACE* MofDataParserTest::MakeEventWithString(const char* a_string,
+                                                    size_t length) {
+  EVENT_TRACE* event = MakeEventWithDataOfSize(length);
+  ::memcpy(event->MofData, a_string, length);
+  return event;
+}
+
+// Tests reading a primitive value.  ReadDWORD, ReadInt, and ReadPointer share
+// the same implementation, so this test covers all three.
+TEST_F(MofDataParserTest, ReadPrimitive) {
+
+  // Read a valid DWORD.
+  EVENT_TRACE* event = MakeEventWithDWORD(5);
+  {
+    DWORD value = 0;
+    logging_win::MofDataParser parser(event);
+    EXPECT_FALSE(parser.empty());
+    EXPECT_TRUE(parser.ReadDWORD(&value));
+    EXPECT_EQ(5UL, value);
+    EXPECT_TRUE(parser.empty());
+  }
+
+  // Try again if there's insufficient data.
+  --(event->MofLength);
+  {
+    DWORD value = 0;
+    logging_win::MofDataParser parser(event);
+    EXPECT_FALSE(parser.empty());
+    EXPECT_FALSE(parser.ReadDWORD(&value));
+    EXPECT_EQ(0UL, value);
+  }
+}
+
+// Tests reading an array of pointer-sized values.  These arrays are encoded by
+// writing a DWORD item count followed by the items.
+TEST_F(MofDataParserTest, ReadPointerArray) {
+  const void* const pointers[] = { this, &buffer_ };
+  const DWORD array_size = arraysize(pointers);
+
+  // Read a valid array of two pointers.
+  EVENT_TRACE* event = MakeEventWithPointerArray(&pointers[0], array_size);
+  {
+    DWORD size = 0;
+    const intptr_t* values = NULL;
+
+    logging_win::MofDataParser parser(event);
+    EXPECT_FALSE(parser.empty());
+    EXPECT_TRUE(parser.ReadDWORD(&size));
+    EXPECT_EQ(array_size, size);
+    EXPECT_TRUE(parser.ReadPointerArray(size, &values));
+    EXPECT_EQ(0, ::memcmp(&pointers[0], values, sizeof(*values) * size));
+    EXPECT_TRUE(parser.empty());
+  }
+
+  // Try again if there's insufficient data.
+  --(event->MofLength);
+  {
+    DWORD size = 0;
+    const intptr_t* values = NULL;
+
+    logging_win::MofDataParser parser(event);
+    EXPECT_FALSE(parser.empty());
+    EXPECT_TRUE(parser.ReadDWORD(&size));
+    EXPECT_EQ(array_size, size);
+    EXPECT_FALSE(parser.ReadPointerArray(size, &values));
+    EXPECT_FALSE(parser.empty());
+  }
+}
+
+// Tests reading a structure.
+TEST_F(MofDataParserTest, ReadStructure) {
+  struct Spam {
+    int blorf;
+    char spiffy;
+  };
+  const Spam canned_meat = { 47, 'Y' };
+
+  // Read a pointer to a structure.
+  EVENT_TRACE* event = MakeEventWithBlittedValue(canned_meat);
+  {
+    const Spam* value = NULL;
+    logging_win::MofDataParser parser(event);
+    EXPECT_FALSE(parser.empty());
+    EXPECT_TRUE(parser.ReadStructure(&value));
+    EXPECT_EQ(canned_meat.blorf, value->blorf);
+    EXPECT_EQ(canned_meat.spiffy, value->spiffy);
+    EXPECT_TRUE(parser.empty());
+  }
+
+  // Try again if there's insufficient data.
+  --(event->MofLength);
+  {
+    const Spam* value = NULL;
+    logging_win::MofDataParser parser(event);
+    EXPECT_FALSE(parser.empty());
+    EXPECT_FALSE(parser.ReadStructure(&value));
+    EXPECT_FALSE(parser.empty());
+  }
+}
+
+// Tests reading null-terminated string.
+TEST_F(MofDataParserTest, ReadString) {
+  const char a_string_nl[] = "sometimes i get lost in my own thoughts.\n";
+  const char a_string[] = "sometimes i get lost in my own thoughts.";
+
+  // Read a string with a trailing newline.
+  EVENT_TRACE* event =
+      MakeEventWithString(a_string_nl, arraysize(a_string_nl));
+  {
+    base::StringPiece value;
+    logging_win::MofDataParser parser(event);
+    EXPECT_FALSE(parser.empty());
+    EXPECT_TRUE(parser.ReadString(&value));
+    EXPECT_EQ(base::StringPiece(&a_string_nl[0], arraysize(a_string_nl) - 2),
+              value);
+    EXPECT_TRUE(parser.empty());
+  }
+
+  // Read a string without a trailing newline.
+  event = MakeEventWithString(a_string, arraysize(a_string));
+  {
+    base::StringPiece value;
+    logging_win::MofDataParser parser(event);
+    EXPECT_FALSE(parser.empty());
+    EXPECT_TRUE(parser.ReadString(&value));
+    EXPECT_EQ(base::StringPiece(&a_string[0], arraysize(a_string) - 1), value);
+    EXPECT_TRUE(parser.empty());
+  }
+
+  // Try a string that isn't terminated.
+  event = MakeEventWithString(a_string, arraysize(a_string) - 1);
+  {
+    base::StringPiece value;
+    logging_win::MofDataParser parser(event);
+    EXPECT_FALSE(parser.empty());
+    EXPECT_FALSE(parser.ReadString(&value));
+    EXPECT_FALSE(parser.empty());
+  }
+}