Build: Switch to CMake :^)

Closes https://github.com/SerenityOS/serenity/issues/2080

AK/Tests/CMakeLists.txt

@@ -0,0 +1,12 @@
+file(GLOB AK_TEST_SOURCES "*.cpp")
+
+foreach(source ${AK_TEST_SOURCES})
+    get_filename_component(name ${source} NAME_WE)
+    add_executable(${name} ${source})
+    target_link_libraries(${name} LagomCore)
+    add_test(
+        NAME ${name}
+        COMMAND ${name}
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+    )
+endforeach()

AK/Tests/Makefile

@@ -1,37 +0,0 @@
-SHARED_TEST_SOURCES = \
-	../String.cpp \
-	../StringImpl.cpp \
-	../StringBuilder.cpp \
-	../StringView.cpp \
-	../StringUtils.cpp \
-	../LogStream.cpp \
-	../JsonValue.cpp \
-	../JsonParser.cpp \
-    ../FlyString.cpp \
-    ../FileSystemPath.cpp \
-    ../URL.cpp \
-    ../Utf8View.cpp
-
-SRCS = $(wildcard *.cpp)
-SHARED_TEST_OBJS = ${SHARED_TEST_SOURCES:.cpp=.host.o}
-OBJS = ${SRCS:.cpp=.host.o} $(SHARED_TEST_OBJS)
-APPS = ${SRCS:.cpp=}
-
-EXTRA_CLEAN = $(APPS) *.o ../*.host.o
-
-USE_HOST_CXX = 1
-
-include ../../Makefile.common
-
-CXXFLAGS = -std=c++17 -Wall -Wextra -ggdb3 -O2 -I../ -I../../
-
-APPS_RUN = $(addsuffix .run,$(APPS))
-test: $(APPS) $(APPS_RUN)
-$(APPS_RUN): %.run:
-	./$*
-
-$(APPS): %: %$(OBJ_SUFFIX).o $(SHARED_TEST_OBJS)
-	@echo "LINK $@"
-	$(QUIET) $(CXX) -o $@ $< $(SHARED_TEST_OBJS) $(LDFLAGS)
-
-all: | $(APPS) $(APPS_RUN)