// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "src/reader/spirv/fail_stream.h"

#include <memory>
#include <sstream>

#include "gmock/gmock.h"

namespace tint {
namespace reader {
namespace spirv {
namespace {

using ::testing::Eq;

using FailStreamTest = ::testing::Test;

TEST_F(FailStreamTest, ConversionToBoolIsSameAsStatusMethod) {
  bool flag = true;
  FailStream fs(&flag, nullptr);

  EXPECT_TRUE(fs.status());
  EXPECT_TRUE(bool(fs));  // NOLINT
  flag = false;
  EXPECT_FALSE(fs.status());
  EXPECT_FALSE(bool(fs));  // NOLINT
  flag = true;
  EXPECT_TRUE(fs.status());
  EXPECT_TRUE(bool(fs));  // NOLINT
}

TEST_F(FailStreamTest, FailMethodChangesStatusToFalse) {
  bool flag = true;
  FailStream fs(&flag, nullptr);
  EXPECT_TRUE(flag);
  EXPECT_TRUE(bool(fs));  // NOLINT
  fs.Fail();
  EXPECT_FALSE(flag);
  EXPECT_FALSE(bool(fs));  // NOLINT
}

TEST_F(FailStreamTest, FailMethodReturnsSelf) {
  bool flag = true;
  FailStream fs(&flag, nullptr);
  FailStream& result = fs.Fail();
  EXPECT_THAT(&result, Eq(&fs));
}

TEST_F(FailStreamTest, ShiftOperatorAccumulatesValues) {
  bool flag = true;
  std::stringstream ss;
  FailStream fs(&flag, &ss);

  ss << "prefix ";
  fs << "cat " << 42;

  EXPECT_THAT(ss.str(), Eq("prefix cat 42"));
}

}  // namespace
}  // namespace spirv
}  // namespace reader
}  // namespace tint