1 files changed, 104 insertions, 0 deletions
diff --git a/libmisc/tests/test_assert.c b/libmisc/tests/test_assert.c
new file mode 100644
index 0000000..84b4d36
--- /dev/null
+++ b/libmisc/tests/test_assert.c
@@ -0,0 +1,104 @@
+/* libmisc/tests/test_assert.c - Tests for <libmisc/assert.h>
+ *
+ * Copyright (C) 2024-2025  Luke T. Shumaker <lukeshu@lukeshu.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+#include <setjmp.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <libmisc/_intercept.h>
+#include <libmisc/assert.h>
+#include <libmisc/fmt.h>
+#include <libmisc/macro.h>
+
+#include "test.h"
+
+/* Intercept failures and logging *********************************************/
+
+static bool           global_failed;
+static struct fmt_buf global_log;
+static jmp_buf        global_env;
+
+#define with_intercept() ({                         \
+			global_failed = false;      \
+			global_log_clear();         \
+			setjmp(global_env) == 0;    \
+		})
+
+void __lm_abort(void) {
+	global_failed = true;
+	longjmp(global_env, 1);
+}
+
+void __lm_putchar(unsigned char c) {
+	if (global_log.len+1 >= global_log.cap) {
+		global_log.cap += 16;
+		global_log.dat = realloc(global_log.dat, global_log.cap);
+		memset(global_log.dat + global_log.len, 0, global_log.cap - global_log.len);
+	}
+	((uint8_t *)global_log.dat)[global_log.len++] = (uint8_t)c;
+}
+
+static void global_log_clear(void) {
+	if (global_log.dat)
+		memset(global_log.dat, 0, global_log.cap);
+	global_log.len = 0;
+}
+
+#define __builtin_unreachable() test_assert(0)
+
+/* Utilities ******************************************************************/
+
+#define test_should_succeed(test) do {                    \
+		if (with_intercept()) {                   \
+			test;                             \
+		}                                         \
+		test_assert(global_failed == false);      \
+		test_assert(global_log.len == 0);         \
+	} while (0)
+
+#define test_should_fail(test, exp_log) do {                     \
+		if (with_intercept()) {                          \
+			test;                                    \
+		}                                                \
+		test_assert(global_failed == true);              \
+		if (!(global_log.len != 0 &&                     \
+		      strcmp(global_log.dat, exp_log) == 0)) {   \
+			printf("exp = \"%s\"\n"                  \
+			       "act = \"%s\"\n",                 \
+			       exp_log, (char *)global_log.dat); \
+			test_assert(0);                          \
+		}                                                \
+	} while (0)
+
+/* Actual tests ***************************************************************/
+
+static_assert(sizeof(char) == 1);
+
+int main() {
+	unsigned char x = 4;
+	static_assert(0 <= x);
+	static_assert(x < 256);
+
+#ifndef NDEBUG
+	test_should_succeed(assert(true));
+	test_should_fail(assert(false), "error: ASSERT: "__FILE__":"LM_STR_(__LINE__)":main(): assertion \"false\" failed\n");
+
+	test_should_succeed(assert_msg(true, "foo"));
+	test_should_fail(assert_msg(false, "foo"), "error: ASSERT: "__FILE__":"LM_STR_(__LINE__)":main(): assertion \"false\" failed: foo\n");
+	test_should_succeed(assert_msg(true, NULL));
+	test_should_fail(assert_msg(false, NULL), "error: ASSERT: "__FILE__":"LM_STR_(__LINE__)":main(): assertion \"false\" failed\n");
+
+	test_should_fail(assert_notreached("xxx"), "error: ASSERT: "__FILE__":"LM_STR_(__LINE__)":main(): assertion \"notreached\" failed: xxx\n");
+#endif
+
+	if (global_log.dat) {
+		global_log_clear();
+		free(global_log.dat);
+		global_log.dat = NULL;
+		global_log.cap = 0;
+	}
+	return 0;
+}