Add string literal suffixes to create QStrings, QByteArrays, and QLatin1String(View)s at compile time (#4706)

tests/src/Literals.cpp

@@ -0,0 +1,41 @@
+#include "common/Literals.hpp"
+
+#include <gtest/gtest.h>
+
+using namespace chatterino::literals;
+
+// These tests ensure that the behavior of the suffixes is the same across Qt versions.
+
+TEST(Literals, String)
+{
+    ASSERT_EQ(u""_s, QStringLiteral(""));
+    ASSERT_EQ(u"1"_s, QStringLiteral("1"));
+    ASSERT_EQ(u"12"_s, QStringLiteral("12"));
+    ASSERT_EQ(u"123"_s, QStringLiteral("123"));
+}
+
+TEST(Literals, Latin1String)
+{
+    ASSERT_EQ(""_L1, QLatin1String(""));
+    ASSERT_EQ("1"_L1, QLatin1String("1"));
+    ASSERT_EQ("12"_L1, QLatin1String("12"));
+    ASSERT_EQ("123"_L1, QLatin1String("123"));
+
+    ASSERT_EQ(""_L1, u""_s);
+    ASSERT_EQ("1"_L1, u"1"_s);
+    ASSERT_EQ("12"_L1, u"12"_s);
+    ASSERT_EQ("123"_L1, u"123"_s);
+
+    ASSERT_EQ(QString(""_L1), u""_s);
+    ASSERT_EQ(QString("1"_L1), u"1"_s);
+    ASSERT_EQ(QString("12"_L1), u"12"_s);
+    ASSERT_EQ(QString("123"_L1), u"123"_s);
+}
+
+TEST(Literals, ByteArray)
+{
+    ASSERT_EQ(""_ba, QByteArrayLiteral(""));
+    ASSERT_EQ("1"_ba, QByteArrayLiteral("1"));
+    ASSERT_EQ("12"_ba, QByteArrayLiteral("12"));
+    ASSERT_EQ("123"_ba, QByteArrayLiteral("123"));
+}