Split g_test_log() messages that contain multiple linesebassi/test-tap-lines

When using TAP we want every single line to be one of the following:

 - a valid TAP clause
 - a comment
 - a blank line

Typical explicit test logs are single line comments, but in some cases
we might end up printing debug messages from libraries, and those may
contain multiple lines. When that happens, we break the TAP and fail the
test in conditions entirely outside of our control.

One option to avoid outright failure is to always prepend each line of a
messge with `#`, to ensure that the whole thing is considered a comment.

1 files changed, 14 insertions, 1 deletions

diff --git a/glib/gtestutils.c b/glib/gtestutils.c
index d24c6e186..dc153d1af 100644
--- a/glib/gtestutils.c
+++ b/glib/gtestutils.c
@@ -1072,7 +1072,20 @@ g_test_log (GTestLogType lbit,
       break;
     case G_TEST_LOG_MESSAGE:
       if (test_tap_log)
-        g_print ("# %s\n", string1);
+        {
+          if (strstr (string1, "\n") == NULL)
+            g_print ("# %s\n", string1);
+          else
+            {
+              char **lines = g_strsplit (string1, "\n", -1);
+              guint n_lines = g_strv_length (lines);
+
+              for (guint i = 0; i < n_lines; i++)
+                g_print ("# %s\n", lines[i]);
+
+              g_strfreev (lines);
+            }
+        }
       else if (g_test_verbose ())
         g_print ("(MSG: %s)\n", string1);
       break;