meta: re-organise tests

fx.collections/test/simple.c

@@ -0,0 +1,11 @@
+#include <fx/ds/string.h>
+
+int main(void)
+{
+	fx_string *string = FX_CSTR("Hello, world!");
+	printf("string object = ");
+	fx_object_to_string(string, fx_stdout);
+	printf("\n");
+	fx_string_unref(string);
+	return 0;
+}