Add empty syntax type for suppressing output

1 files changed, 7 insertions, 0 deletions

diff --git a/wscript b/wscript
index cb930677..8b30fea5 100644
--- a/wscript
+++ b/wscript
@@ -672,9 +672,16 @@ def test(tst):
         check([serdi, '-h'])
         check([serdi, '-k', '512', '-s', '<foo> a <#Thingie> .'])
         check([serdi, os.devnull])
+
         with tempfile.TemporaryFile(mode='r') as stdin:
             check([serdi, '-'], stdin=stdin)
 
+        with tempfile.TemporaryFile(mode='w') as stdout:
+            cmd = [serdi, '-o', 'empty', '%s/serd.ttl' % srcdir]
+            check(cmd, stdout=stdout)
+            stdout.seek(0, 2)  # Seek to end
+            check(lambda: stdout.tell() == 0, name='empty output')
+
     with tst.group('BadCommands',
                    expected=1,
                    stderr=autowaf.NONEMPTY) as check: