test: add structure & framework for writing tests

test/cron/test_parse.c

@@ -0,0 +1,69 @@
+#include "acutest.h"
+#include "vieter_cron.h"
+
+void test_tutorial(void) {
+  void *mem;
+
+  mem = malloc(10);
+  TEST_CHECK(mem != NULL);
+
+  mem = realloc(mem, 20);
+  TEST_CHECK(mem != NULL);
+
+  free(mem);
+}
+
+void test_fail(void) {
+  int a, b;
+
+  /* This condition is designed to fail so you can see what the failed test
+   * output looks like. */
+  a = 1;
+  b = 2;
+  TEST_CHECK(a + b == 5);
+
+  /* Here is TEST_CHECK_ in action. */
+  TEST_CHECK_(a + b == 5, "%d + %d == 5", a, b);
+
+  /* We may also show more information about the failure. */
+  if (!TEST_CHECK(a + b == 5)) {
+    TEST_MSG("a: %d", a);
+    TEST_MSG("b: %d", b);
+  }
+
+  /* The macro TEST_MSG() only outputs something when the preceding
+   * condition fails, so we can avoid the 'if' statement. */
+  TEST_CHECK(a + b == 3);
+  TEST_MSG("a: %d", a);
+  TEST_MSG("b: %d", b);
+}
+
+static void helper(void) {
+  /* Kill the current test with a condition which is never true. */
+  TEST_ASSERT(1 == 2);
+
+  /* This never happens because the test is aborted above. */
+  TEST_CHECK(1 + 2 == 2 + 1);
+}
+
+void test_abort(void) {
+  helper();
+
+  /* This test never happens because the test is aborted inside the helper()
+   * function. */
+  TEST_CHECK(1 * 2 == 2 * 1);
+}
+
+void test_crash(void) {
+  int *invalid = ((int *)NULL) + 0xdeadbeef;
+
+  *invalid = 42;
+  TEST_CHECK_(1 == 1, "This should never execute, due to a write into "
+                      "an invalid address.");
+}
+
+TEST_LIST = {{"tutorial", test_tutorial},
+             {"fail", test_fail},
+             {"abort", test_abort},
+             {"crash", test_crash},
+             {NULL, NULL}};