fix coverage

.travis.yml

@@ -34,4 +34,4 @@ script:
   - python tests/test.py --with-coverage -s tests/ipv6.json -c tests/ipv6-client-side.json
   - python tests/test.py --with-coverage -b "-m rc4-md5 -k testrc4 -s 127.0.0.1 -p 8388" -a "-m rc4-md5 -k testrc4 -s 127.0.0.1 -p 8388 -l 1081"
   - python tests/test.py --with-coverage -b "-m aes-256-cfb -k testrc4 -s 127.0.0.1 -p 8388" -a "-m aes-256-cfb -k testrc4 -s 127.0.0.1 -p 8388 -l 1081"
-  - coverage report --include=shadowsocks/*
+  - coverage combine && coverage report --include=shadowsocks/*

tests/test.py

@@ -44,7 +44,7 @@ parser.add_argument('--with-coverage', action='store_true', default=None)
 config = parser.parse_args()
 
 if config.with_coverage:
-    python = ['coverage', 'run', '-a']
+    python = ['coverage', 'run', '-p', '-a']
 
 client_args = python + ['shadowsocks/local.py', '-v']
 server_args = python + ['shadowsocks/server.py', '-v']