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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/wtf/text/strcat.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace WTF {
TEST(StrCatTest, Only8Bit) {
const String src8("8bit 8bit");
String result = StrCat({"foo \"", src8, "\" bar."});
EXPECT_EQ("foo \"8bit 8bit\" bar.", result);
EXPECT_TRUE(result.Is8Bit());
}
TEST(StrCatTest, Only16Bit) {
const String src16_1(u"foo \"");
const String src16_2(u"16bit 16bit");
const String src16_3(u"\" bar.");
String result = StrCat({src16_1, src16_2, src16_3});
EXPECT_EQ("foo \"16bit 16bit\" bar.", result);
EXPECT_FALSE(result.Is8Bit());
}
TEST(StrCatTest, MixedBits) {
const String src16(u"16bit 16bit");
String result = StrCat({"foo \"", src16, "\" bar."});
EXPECT_EQ("foo \"16bit 16bit\" bar.", result);
EXPECT_FALSE(result.Is8Bit());
}
TEST(StrCatTest, MixedBitsResulting8it) {
const String src16(u"a");
ASSERT_FALSE(src16.Is8Bit());
String result = StrCat({"foo \"", src16, "\" bar."});
EXPECT_EQ("foo \"a\" bar.", result);
EXPECT_TRUE(result.Is8Bit());
}
TEST(StrCatTest, StringSelfSubstitution) {
String foo("abc");
StringView view(" after");
// We had an issue that the following code caused a DCHECK failure in
// ~StringView() because a StringView created for `foo` outlives the
// initial StringImpl of `foo`.
foo = StrCat({"before ", foo, view});
EXPECT_EQ("before abc after", foo);
EXPECT_EQ(" after", view);
}
} // namespace WTF
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