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#include "src/tint/lang/spirv/reader/ast_parser/fail_stream.h"

#include "gmock/gmock.h"
#include "src/tint/utils/text/string_stream.h"

namespace tint::spirv::reader::ast_parser {
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;
    StringStream ss;
    FailStream fs(&flag, &ss);

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

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

}  // namespace
}  // namespace tint::spirv::reader::ast_parser