Add new HTTP/2 and HPACK decoder in net/http2/.

net/http2/tools/failure.h

Index: net/http2/tools/failure.h
diff --git a/net/http2/tools/failure.h b/net/http2/tools/failure.h
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+// Copyright 2016 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.
+
+#ifndef NET_HTTP2_TOOLS_FAILURE_H_
+#define NET_HTTP2_TOOLS_FAILURE_H_
+
+// Defines VERIFY_* macros, analogous to gUnit's EXPECT_* and ASSERT_* macros,
+// but these return an appropriate AssertionResult if the condition is not
+// satisfied. This enables one to create a function for verifying expectations
+// that are needed by multiple callers or that rely on arguments not accessible
+// to the main test method. Using VERIFY_SUCCESS allows one to annotate the
+// a failing AssertionResult with more context.
+
+#include <iosfwd>
+#include <sstream>
+#include <string>
+
+#include "base/macros.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+namespace test {
+
+template <typename T>
+class VerifyThatHelper {
+ public:
+  VerifyThatHelper(const T& value, ::testing::Matcher<T> matcher) {
+    matches_ = matcher.Matches(value);
+    if (!matches_) {
+      printed_value_ = ::testing::PrintToString(value);
+
+      std::ostringstream os;
+      matcher.DescribeTo(&os);
+      matcher_description_ = os.str();
+    }
+  }
+
+  operator bool() const { return matches_; }
+
+  const std::string& printed_value() const { return printed_value_; }
+  const std::string& matcher_description() const {
+    return matcher_description_;
+  }
+
+ private:
+  bool matches_;
+  std::string printed_value_;
+  std::string matcher_description_;
+
+  DISALLOW_COPY_AND_ASSIGN(VerifyThatHelper);
+};
+
+// Constructs a failure message for Boolean assertions such as VERIFY_TRUE.
+std::string GetBoolAssertionFailureMessage(
+    const ::testing::AssertionResult& assertion_result,
+    const char* expression_text,
+    const char* actual_predicate_value,
+    const char* expected_predicate_value);
+
+}  // namespace test
+}  // namespace net
+
+// Macro for adding verification location to output stream or AssertionResult.
+// Starts with a new-line because of the way that gUnit displays failures for
+//    EXPECT_TRUE(CallToFunctionThatFailsToVerify()).
+#define VERIFY_FAILED_LOCATION_                   \
+  "\n"                                            \
+      << "(VERIFY failed in " << __func__ << "\n" \
+      << "               at " __FILE__ " : " << __LINE__ << ")\n"
+
+// Implements Boolean test verifications VERIFY_TRUE and VERIFY_FALSE.
+// text is a textual represenation of expression as it was passed into
+// VERIFY_TRUE or VERIFY_FALSE.
+// clang-format off
+#define VERIFY_TEST_BOOLEAN_(condition, text, actual, expected)        \
+  if (const ::testing::AssertionResult __assertion_result =            \
+          ::testing::AssertionResult((condition) ? expected : actual)) \
+    ;                                                                  \
+  else                                                                 \
+    return ::testing::AssertionFailure()                               \
+         << VERIFY_FAILED_LOCATION_                                    \
+         << ::net::test::GetBoolAssertionFailureMessage(              \
+                __assertion_result, text, #actual, #expected)
+// clang-format on
+
+// Boolean assertions. condition can be either a Boolean expression or an
+// expression convertable to a boolean (such as a ::gtl::labs::optional).
+#define VERIFY_TRUE(condition) \
+  VERIFY_TEST_BOOLEAN_(condition, #condition, false, true)
+
+#define VERIFY_FALSE(condition) \
+  VERIFY_TEST_BOOLEAN_(condition, #condition, true, false)
+
+// Convenient helper macro for writing methods that return an AssertionFailure
+// that includes the tested condition in the message (in the manner of
+// ASSERT_THAT and EXPECT_THAT).
+//
+// This macro avoids the do {} while(false) trick and putting braces around
+// the if so you can do things like:
+// VERIFY_THAT(foo, Lt(4)) << "foo too big in iteration " << i;
+// (This parallels the implementation of CHECK().)
+//
+// We use an if statement with an empty true branch so that this doesn't eat
+// a neighboring else when used in an unbraced if statement like:
+// if (condition)
+//   VERIFY_THAT(foo, Eq(bar));
+// else
+//   FAIL();
+#define VERIFY_THAT(value, matcher)                                       \
+  if (const auto& _verify_that_helper =                                   \
+          ::net::test::VerifyThatHelper<decltype(value)>(value, matcher)) \
+    ;                                                                     \
+  else                                                                    \
+    return ::testing::AssertionFailure()                                  \
+           << "Failed to verify that '" #value "' ("                      \
+           << _verify_that_helper.printed_value() << ") "                 \
+           << _verify_that_helper.matcher_description()                   \
+           << " (on " __FILE__ ":" << __LINE__ << "). "
+
+// Useful variants of VERIFY_THAT, similar to the corresponding EXPECT_X or
+// ASSERT_X defined by gUnit.
+#define VERIFY_EQ(val1, val2) VERIFY_THAT(val1, ::testing::Eq(val2))
+#define VERIFY_NE(val1, val2) VERIFY_THAT(val1, ::testing::Ne(val2))
+#define VERIFY_GT(val1, val2) VERIFY_THAT(val1, ::testing::Gt(val2))
+#define VERIFY_LT(val1, val2) VERIFY_THAT(val1, ::testing::Lt(val2))
+#define VERIFY_GE(val1, val2) VERIFY_THAT(val1, ::testing::Ge(val2))
+#define VERIFY_LE(val1, val2) VERIFY_THAT(val1, ::testing::Le(val2))
+
+// Convenience macro matching EXPECT_OK
+#define VERIFY_OK(statement) VERIFY_EQ(::util::Status::OK, (statement))
+
+// This version verifies that an expression of type AssertionResult is
+// AssertionSuccess. If instead the value is an AssertionFailure, it appends
+// info about the current code location to the failure's message and returns
+// the failure to the caller of the current method. It permits the code site
+// to append further messages to the failure message. For example:
+//    VERIFY_SUCCESS(SomeCall()) << "Some more context about SomeCall";
+// clang-format off
+#define VERIFY_SUCCESS(expr)                                  \
+  if (::testing::AssertionResult __assertion_result = (expr)) \
+    ;                                                         \
+  else                                                        \
+    return __assertion_result << VERIFY_FAILED_LOCATION_
+// clang-format on
+
+#define VERIFY_AND_RETURN_SUCCESS(expression) \
+  {                                           \
+    VERIFY_SUCCESS(expression);               \
+    return ::testing::AssertionSuccess();     \
+  }
+
+#endif  // NET_HTTP2_TOOLS_FAILURE_H_