added unit tests for lot to stderr and stderr-full

Fixes: #806

Added unit tests verifying that logs entries via
bc_log_to_stderr and bc_log_to_stderr_full are written
to stderr.

Signed-off-by: Michael Engel <mengel@redhat.com>

src/libbluechi/test/log/bc_log_to_stderr_full_test.c

@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#include <assert.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "libbluechi/log/log.h"
+
+LogLevel lvl = LOG_LEVEL_INFO;
+const char *file = "testfile.c";
+const char *line = "line10";
+const char *func = "testfunc";
+const char *msg = "log_message";
+
+bool check_buffer(char buf[]) {
+        bool result = true;
+        if (!strstr(buf, log_level_to_string(lvl))) {
+                result = false;
+                fprintf(stderr, "FAILED: LogLevel not found in log entry");
+        }
+        if (!strstr(buf, file)) {
+                result = false;
+                fprintf(stderr, "FAILED: File location not found in log entry");
+        }
+        if (!strstr(buf, line)) {
+                result = false;
+                fprintf(stderr, "FAILED: Line location not found in log entry");
+        }
+        if (!strstr(buf, func)) {
+                result = false;
+                fprintf(stderr, "FAILED: Function name not found in log entry");
+        }
+        if (!strstr(buf, msg)) {
+                result = false;
+                fprintf(stderr, "FAILED: Message not found in log entry");
+        }
+
+        return result;
+}
+
+int main() {
+        bool result = true;
+
+        char buf[BUFSIZ] = { '\0' };
+
+        /* test case: log without data */
+
+        // set buffer to stderr
+        setbuf(stderr, buf);
+        bc_log_to_stderr_full_with_location(lvl, file, line, func, msg, NULL);
+        // avoid adding test logs to buffer
+        setbuf(stderr, NULL);
+        result = check_buffer(buf);
+        if (strstr(buf, "data=")) {
+                result = false;
+                fprintf(stderr, "FAILED: Data found in log entry, but none was expected");
+        }
+
+        /* test case: log with data */
+
+        // set buffer to stderr
+        setbuf(stderr, buf);
+        const char *data = "{data: this is it}";
+        bc_log_to_stderr_full_with_location(lvl, file, line, func, msg, data);
+        // avoid adding test logs to buffer
+        setbuf(stderr, NULL);
+        result = check_buffer(buf);
+        if (!strstr(buf, data)) {
+                result = false;
+                fprintf(stderr, "FAILED: Data not found in log entry, but was expected");
+        }
+
+        if (result) {
+                return EXIT_SUCCESS;
+        }
+        return EXIT_FAILURE;
+}

src/libbluechi/test/log/bc_log_to_stderr_test.c

@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#include <assert.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "libbluechi/log/log.h"
+
+LogLevel lvl = LOG_LEVEL_INFO;
+const char *file = "testfile.c";
+const char *line = "line10";
+const char *func = "testfunc";
+const char *msg = "log_message";
+
+bool check_buffer(char buf[]) {
+        bool result = true;
+        if (!strstr(buf, log_level_to_string(lvl))) {
+                result = false;
+                fprintf(stderr, "FAILED: LogLevel not found in log entry");
+        }
+        if (strstr(buf, file)) {
+                result = false;
+                fprintf(stderr, "FAILED: File location found in log entry, but none expected");
+        }
+        if (strstr(buf, line)) {
+                result = false;
+                fprintf(stderr, "FAILED: Line location found in log entry, but none expected");
+        }
+        if (strstr(buf, func)) {
+                result = false;
+                fprintf(stderr, "FAILED: Function name found in log entry, but none expected");
+        }
+        if (!strstr(buf, msg)) {
+                result = false;
+                fprintf(stderr, "FAILED: Message not found in log entry");
+        }
+
+        return result;
+}
+
+int main() {
+        bool result = true;
+
+        char buf[BUFSIZ] = { '\0' };
+
+        // set buffer to stderr
+        setbuf(stderr, buf);
+        bc_log_to_stderr_with_location(lvl, file, line, func, msg, NULL);
+        // avoid adding test logs to buffer
+        setbuf(stderr, NULL);
+        result = check_buffer(buf);
+
+        if (result) {
+                return EXIT_SUCCESS;
+        }
+        return EXIT_FAILURE;
+}

src/libbluechi/test/log/meson.build

@@ -1,9 +1,11 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 
 common_src = [
-  'string_to_log_level_test',
-  'log_target_to_str_test',
   'bc_log_init_test',
+  'bc_log_to_stderr_full_test',
+  'bc_log_to_stderr_test',
+  'log_target_to_str_test',
+  'string_to_log_level_test',
 ]
 
 foreach src : common_src