Unit Tests

- Corrected expected output.
- Added 'complete' task to the on-modify-misbehave4 test hook script.

test/hooks.on-modify.t

@@ -103,7 +103,7 @@ class TestHooksOnModify(TestCase):
 
         code, out, err = self.t(("add", "foo"))
         code, out, err = self.t.runError(("1", "modify", "+tag"))
-        self.assertIn("ERROR DIFFERENT JSON", err)
+        self.assertIn("Hook Error: JSON must be for the same task:", err)
         self.t.hooks[hookname].assertTriggered()
         self.t.hooks[hookname].assertTriggeredCount(1)
         self.t.hooks[hookname].assertExitcode(0)