Add an empty unit test.

test/unit/CMakeLists.txt

@@ -0,0 +1,18 @@
+project(tawashi_unittest CXX)
+
+add_executable(${PROJECT_NAME}
+	check.cpp
+)
+
+target_include_directories(${PROJECT_NAME}
+	PRIVATE ${TAWASHI_SOURCE_ROOT}/lib/Catch/single_include
+)
+target_link_libraries(${PROJECT_NAME}
+	PRIVATE tawashi_implem
+)
+
+add_test(
+	NAME TawashiUnitTest
+	WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+	COMMAND ${PROJECT_NAME}
+)