1 files changed, 61 insertions, 0 deletions
diff --git a/libmisc/tests/test_log.c b/libmisc/tests/test_log.c
new file mode 100644
index 0000000..286738d
--- /dev/null
+++ b/libmisc/tests/test_log.c
@@ -0,0 +1,61 @@
+/* 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 "test.h"
+
+/* Intercept output ***********************************************************/
+
+static char *log_output = NULL;
+
+int vprintf(const char *format, va_list ap) {
+	return vasprintf(&log_output, format, ap);
+}
+
+/* Actual tests ***************************************************************/
+
+#define should_print(_exp, cmd) do {                           \
+		char *exp = _exp;                              \
+		test_assert(!log_output);                      \
+		cmd;                                           \
+		if (!exp)                                      \
+			test_assert(!log_output);              \
+		else                                           \
+			if (!(log_output != NULL &&            \
+			      strcmp(log_output, exp) == 0)) { \
+				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));
+#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));
+	return 0;
+}