Create project skeleton

tests/CMakeLists.txt

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+add_library(testing testing.c)
+set_default_target_options(testing)
+target_include_directories(testing PUBLIC include)
+
+function(add_test_suite source)
+  string(REGEX REPLACE ".c$" "" name ${source})
+  add_executable(${name} ${source})
+  set_default_target_options(${name})
+  target_link_libraries(${name} PRIVATE engine testing)
+  add_test(NAME ${name} COMMAND ${name})
+endfunction()
+
+function(add_test_suites)
+  foreach(source ${ARGN})
+	add_test_suite(${source})
+  endforeach()
+endfunction()
+
+add_test_suites(
+  foo_tests.c
+)

tests/foo_tests.c

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+/*
+ * 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();
+}

tests/include/testing.h

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+/*
+ * Copyright (c) Camden Dixie O'Brien
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+#ifndef TESTING_H
+#define TESTING_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define TESTING_BEGIN() fail_count = 0
+#define TESTING_END() fail_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE
+
+#define FAIL \
+	do { \
+		++fail_count; \
+		printf("%s: FAIL @ %s:%d\n", __func__, __FILE__, __LINE__); \
+		return; \
+	} while (0)
+
+#define ASSERT_FALSE(p) \
+	do { \
+		if (p) \
+			FAIL; \
+	} while (0)
+
+#define ASSERT_TRUE(p) ASSERT_FALSE(!(p))
+#define ASSERT_EQ(x, y) ASSERT_FALSE((x) != (y))
+#define ASSERT_NE(x, y) ASSERT_FALSE((x) == (y))
+#define ASSERT_LT(x, y) ASSERT_FALSE((x) <= (y))
+#define ASSERT_NULL(p) ASSERT_FALSE(NULL != (p))
+#define ASSERT_NOT_NULL(p) ASSERT_FALSE(NULL == (p))
+#define ASSERT_MEM_EQ(p, q, n) ASSERT_FALSE(memcmp(p, q, n) != 0)
+
+extern int fail_count;
+
+#endif

tests/testing.c

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+/*
+ * Copyright (c) Camden Dixie O'Brien
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+#include "testing.h"
+
+int fail_count;