diff --git a/tests/c-include/libtest.h b/tests/c-include/libtest.h
new file mode 100644
index 0000000..7ee45eb
--- /dev/null
+++ b/tests/c-include/libtest.h
@@ -0,0 +1,18 @@
+void print_string_pointer(char* p);
+void print_offsets();
+void check_offset(int member_index, int offset);
+struct test* init_struct(struct test* test);
+struct color {
+    int8_t r;
+    int8_t g;
+    int8_t b;
+    int8_t a;
+};
+int color_check(struct color* test);
+int color_check_by_value(struct color color);
+int test_check(struct test* test);
+int test_check_by_value(struct test test);
+struct test* test_new();
+void takes_no_args();
+int takes_no_args_returns_int();
+int test_passing_pointer_address(int* p1, int** p2);