make test coverage 100% (#203)

Signed-off-by: Inada Naoki <songofacandy@gmail.com>

.coveragerc

@@ -2,7 +2,9 @@
 
 [run]
 branch = True
-omit = */tests/*
+omit =
+    */tests/*
+    fluent/__about__.py
 
 [report]
 omit = */tests/*

tests/test_sender.py

@@ -142,6 +142,12 @@ def test_emit_error(self):
         self.assertEqual(len(data), 1)
         self.assertEqual(data[0][2]["message"], "Can't output to log")
 
+    def test_emit_error_no_forward(self):
+        with self._sender as sender:
+            sender.forward_packet_error = False
+            with self.assertRaises(TypeError):
+                sender.emit("blah", {"a": object()})
+
     def test_emit_after_close(self):
         with self._sender as sender:
             self.assertTrue(sender.emit("blah", {"a": "123"}))