Set up test framework with demo test

test/CMakeLists.txt

@@ -1,6 +1,9 @@
-add_library(test_lib
-    "test_io.c"
-)
-target_include_directories(test_lib PUBLIC "include")
+add_library(test_lib "test_io.c")
 set_property(TARGET test_lib PROPERTY C_STANDARD 11)
+target_include_directories(test_lib PUBLIC "include")
 target_link_libraries(test_lib gemhadar_lib)
+
+add_executable(url_tests "url_tests.c")
+set_property(TARGET test_lib PROPERTY C_STANDARD 11)
+target_link_libraries(url_tests gemhadar_lib test_lib)
+add_test(NAME "URL tests" COMMAND url_tests)

test/url_tests.c

@@ -0,0 +1,19 @@
+#include "greatest.h"
+#include "url.h"
+
+TEST foo_returns_42(void)
+{
+    ASSERT_EQ(42, foo());
+    PASS();
+}
+
+GREATEST_MAIN_DEFS();
+
+int main(int argc, char *argv[])
+{
+    GREATEST_MAIN_BEGIN();
+
+    RUN_TEST(foo_returns_42);
+
+    GREATEST_MAIN_END();
+}