1 files changed, 70 insertions, 0 deletions
diff --git a/libmisc/tests/test_log.c b/libmisc/tests/test_log.c
new file mode 100644
index 0000000..49a76ca
--- /dev/null
+++ b/libmisc/tests/test_log.c
@@ -0,0 +1,70 @@
+/* libmisc/tests/test_log.c - Tests for <libmisc/log.h>
+ *
+ * Copyright (C) 2024  Luke T. Shumaker <lukeshu@lukeshu.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+#define _GNU_SOURCE /* for vasprintf() */
+#include <stdarg.h> /* for va_list */
+#include <stdio.h>  /* for vasprintf() */
+#include <stdlib.h> /* for free() */
+#include <string.h> /* for strcmp() */
+
+#define LOG_NAME FROBNICATE
+#include <libmisc/log.h>
+
+#include <libmisc/_intercept.h>
+
+#include "test.h"
+
+/* Intercept output ***********************************************************/
+
+static char *log_output = NULL;
+
+int __lm_printf(const char *format, ...) {
+	va_list va;
+	va_start(va, format);
+	int ret = vasprintf(&log_output, format, va);
+	va_end(va);
+	return ret;
+}
+
+/* Actual tests ***************************************************************/
+
+#define should_print(_exp, cmd) do {                     \
+		char *exp = _exp;                        \
+		test_assert(!log_output);                \
+		cmd;                                     \
+		if (!exp)                                \
+			test_assert(!log_output);        \
+		else {                                   \
+			test_assert(log_output);         \
+			if (strcmp(log_output, exp)) {   \
+				printf("exp = \"%s\"\n"  \
+				       "act = \"%s\"\n", \
+				       exp, log_output); \
+				test_assert(0);          \
+			}                                \
+		}                                        \
+		if (log_output) {                        \
+			free(log_output);                \
+			log_output = NULL;               \
+		}                                        \
+	} while (0)
+
+int main() {
+	should_print("error: FROBNICATE: val=42\n",
+	             errorf("val=%d", 42));
+	should_print("info : FROBNICATE: val=0\n",
+	             infof("val=%d", 0));
+#ifndef NDEBUG
+#define CONFIG_FROBNICATE_DEBUG 1
+	should_print("debug: FROBNICATE: val=-2\n",
+	             debugf("val=%d", -2));
+#undef CONFIG_FROBNICATE_DEBUG
+#define CONFIG_FROBNICATE_DEBUG 0
+	should_print(NULL,
+	             debugf("val=%d", -2));
+#endif
+	return 0;
+}