tests: add test for getting suggestion emoji

It more like selective test for getting at lest two working smilies (cat
and skull with bones).

Telegram/SourceFiles/base/tests/CMakeLists.txt

@@ -9,3 +9,26 @@ add_test(NAME flatMapTest COMMAND tests_flat_map)
 add_executable(tests_flat_set flat_set_tests.cpp)
 target_link_libraries(tests_flat_set Qt5::Core)
 add_test(NAME flatSetTest COMMAND tests_flat_set)
+
+
+add_executable(tests_emojis tests_emojis.cpp
+    $<TARGET_PROPERTY:Kepka,BINARY_DIR>/emoji.cpp
+    $<TARGET_PROPERTY:Kepka,BINARY_DIR>/emoji_suggestions_data.cpp
+    # man, half part of tdesktop, bleat'.
+    $<TARGET_PROPERTY:Kepka,SOURCE_DIR>/SourceFiles/ui/emoji_config.cpp
+    $<TARGET_PROPERTY:Kepka,SOURCE_DIR>/ThirdParty/emoji_suggestions/emoji_suggestions.cpp
+    # damned emojis wants logs. DO NOT WANT. STUB IT.
+    # $<TARGET_PROPERTY:Kepka,SOURCE_DIR>/SourceFiles/logs.cpp
+
+)
+
+# force UTF-8 on MSVC or else test will fail.
+if (MSVC)
+    target_compile_options(tests_emojis PRIVATE "/utf-8")
+endif()
+
+# For autogenerated emoji.h
+# target_compile_definitions(tests_emojis PRIVATE TDESKTOP_DISABLE_CRASH_REPORTS)
+target_include_directories(tests_emojis PRIVATE $<TARGET_PROPERTY:Kepka,BINARY_DIR>)
+target_link_libraries(tests_emojis Qt5::Core Qt5::GuiPrivate Qt5::Widgets) # Qt5::Network)
+add_test(NAME emojisTest COMMAND tests_emojis)

Telegram/SourceFiles/base/tests/tests_emojis.cpp

@@ -0,0 +1,47 @@
+/// @file tests_emojis.cpp Tests several emojis for making sure that it
+/// actually find required emoji.
+#include "emoji_suggestions.h"
+#include "emoji_suggestions_data.h"
+#include <cassert>
+#include <iostream>
+#include <QString>
+#include <QVector>
+#include <QPair>
+#include <QMap>
+#include <string>
+#include "ui/emoji_config.h"
+
+int main()
+{
+    auto str = std::u16string(u":cat:");
+    auto vec = Ui::Emoji::internal::GetReplacements(str[1]); // needs for init internal emoji table.
+    assert(vec != nullptr);
+    auto emoji = Ui::Emoji::internal::GetReplacementEmoji(str);
+    auto cat_u16 = std::u16string(u"🐱");
+    auto cat_w = std::wstring(L"🐱");
+    auto cat_u8 = std::string(u8"🐱"); // u8string in c++20.
+    assert(cat_u16[0] == 0xd83d); // assert that compiler correctly sets charset.
+    assert(cat_w[0] == 0xd83d);   // ...in all available charsets.
+    assert(emoji == cat_u16);     // simple test that :cat: is really 🐱
+    assert(u"☠️" == Ui::Emoji::internal::GetReplacementEmoji(u":skull_and_crossbones:")); // ditto for ☠️
+    return 0;
+}
+
+// stubs for linking (because we do not want to include whole tdesktop)
+
+DBIScale gRealScale;
+DBIScale gScreenScale;
+bool gRetina;
+QVector <QPair<const Ui::Emoji::One *, unsigned short>> gRecentEmoji;
+QVector <QPair<QString, unsigned short>> gRecentEmojiPreload;
+QMap<QString, int> gEmojiVariants;
+
+namespace SignalHandlers {
+void setCrashAnnotation(std::string const &, QString const &) {}
+}
+
+namespace Logs {
+void writeMain(QString const &message) {
+    std::cout << message.toStdString();
+}
+}