Create project skeleton

tests/foo_tests.c

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) Camden Dixie O'Brien
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+#include "foo.h"
+#include "testing.h"
+
+static void test_foo(void)
+{
+	const int res = foo();
+	ASSERT_EQ(42, res);
+}
+
+int main(void)
+{
+	TESTING_BEGIN();
+	test_foo();
+	return TESTING_END();
+}