diff --git a/tests/test.py b/tests/test.py
index 3f2f6010..0a1297b8 100755
--- a/tests/test.py
+++ b/tests/test.py
@@ -35,13 +35,14 @@ parser.add_argument('-a', '--client-args', type=str, default=None)
 parser.add_argument('-b', '--server-args', type=str, default=None)
 parser.add_argument('--should-fail', action='store_true', default=None)
 parser.add_argument('--url', type=str, default=default_url)
-parser.add_argument('--dns', type=str, default='10.19.185.252')
+parser.add_argument('--dns', type=str, default='8.8.8.8')
+parser.add_argument('--bin', type=str, default='')
 
 config = parser.parse_args()
 
-client_args = ['src/ss-local', '-v']
-server_args = ['src/ss-server', '-v', '-u']
-tunnel_args = ['src/ss-tunnel', '-v', '-u', '-l1082', '-L%s:53' % config.dns]
+client_args = ['%s%s' % (config.bin, 'ss-local'), '-v']
+server_args = ['%s%s' % (config.bin, 'ss-server'), '-v', '-u']
+tunnel_args = ['%s%s' % (config.bin, 'ss-tunnel'), '-v', '-u', '-l1082', '-L%s:53' % config.dns]
 
 if config.client_conf:
     client_args.extend(['-c', config.client_conf])
diff --git a/tests/test.sh b/tests/test.sh
index 684e9d4b..1dcd15fc 100755
--- a/tests/test.sh
+++ b/tests/test.sh
@@ -24,13 +24,16 @@ function run_test {
     return 0
 }
 
-run_test python tests/test.py  -c tests/aes.json
-run_test python tests/test.py  -c tests/aes-gcm.json
-run_test python tests/test.py  -c tests/aes-ctr.json
-run_test python tests/test.py  -c tests/rc4-md5.json
-run_test python tests/test.py  -c tests/salsa20.json
-run_test python tests/test.py  -c tests/chacha20.json
-run_test python tests/test.py  -c tests/chacha20-ietf.json
-run_test python tests/test.py  -c tests/chacha20-ietf-poly1305.json
+[ -d src -a -x src/ss-local ] &&
+    BIN="--bin src/"
+
+run_test python tests/test.py $BIN -c tests/aes.json
+run_test python tests/test.py $BIN -c tests/aes-gcm.json
+run_test python tests/test.py $BIN -c tests/aes-ctr.json
+run_test python tests/test.py $BIN -c tests/rc4-md5.json
+run_test python tests/test.py $BIN -c tests/salsa20.json
+run_test python tests/test.py $BIN -c tests/chacha20.json
+run_test python tests/test.py $BIN -c tests/chacha20-ietf.json
+run_test python tests/test.py $BIN -c tests/chacha20-ietf-poly1305.json
 
 exit $result