Unit Tests

- Corrected expected output from the on-modify-misbehave4 test hook script.
- Moved JSON syntax error details to debug output.

test/hooks.on-modify.t

@@ -117,7 +117,7 @@ class TestHooksOnModify(TestCase):
 
         code, out, err = self.t(("add", "foo"))
         code, out, err = self.t.runError(("1", "modify", "+tag"))
-        self.assertIn("ERROR SYNTACTICALLY WRONG JSON", err)
+        self.assertIn("Hook Error: JSON syntax error in: {\"}", err)
         self.t.hooks[hookname].assertTriggered()
         self.t.hooks[hookname].assertTriggeredCount(1)
         self.t.hooks[hookname].assertExitcode(0)