Add option to suppress log output when testing

src/dunst.c

@@ -129,7 +129,7 @@ int dunst_main(int argc, char *argv[])
 
         cmdline_load(argc, argv);
 
-        dunst_log_init();
+        dunst_log_init(false);
 
         if (cmdline_get_bool("-v/-version", false, "Print version")
             || cmdline_get_bool("--version", false, "Print version")) {

src/log.c

@@ -19,13 +19,18 @@ static const char *log_level_to_string(GLogLevelFlags level)
 
 /*
  * Log handling function for GLib's logging wrapper
+ *
+ * If the gpointer is valid, do not do anything
  */
 static void dunst_log_handler(
                 const gchar    *log_domain,
                 GLogLevelFlags  message_level,
                 const gchar    *message,
-                gpointer        user_data)
+                gpointer        testing)
 {
+        if (testing)
+                return;
+
         const char *log_level_str =
                 log_level_to_string(message_level & G_LOG_LEVEL_MASK);
 
@@ -38,10 +43,13 @@ static void dunst_log_handler(
 
 /*
  * Initialise log handling. Can be called any time.
+ *
+ * If bool is %TRUE, it suppresses all logging output.
+ * Primarily used for testing
  */
-void dunst_log_init(void)
+void dunst_log_init(bool testing)
 {
-        g_log_set_default_handler(dunst_log_handler, NULL);
+        g_log_set_default_handler(dunst_log_handler, (void*)testing);
 }
 
 /* vim: set tabstop=8 shiftwidth=8 expandtab textwidth=0: */

src/log.h

@@ -14,7 +14,7 @@
 #define LOG_I g_info
 #define LOG_D g_debug
 
-void dunst_log_init(void);
+void dunst_log_init(bool testing);
 
 #endif
 /* vim: set tabstop=8 shiftwidth=8 expandtab textwidth=0: */

test/test.c

@@ -1,5 +1,9 @@
 #include "greatest.h"
 
+#include <stdbool.h>
+
+#include "src/log.h"
+
 SUITE_EXTERN(suite_utils);
 SUITE_EXTERN(suite_option_parser);
 SUITE_EXTERN(suite_notification);
@@ -8,6 +12,9 @@ SUITE_EXTERN(suite_markup);
 GREATEST_MAIN_DEFS();
 
 int main(int argc, char *argv[]) {
+        // do not print out warning messages, when executing tests
+        dunst_log_init(true);
+
         GREATEST_MAIN_BEGIN();
         RUN_SUITE(suite_utils);
         RUN_SUITE(suite_option_parser);