Raise an error when passing an empty string to split_port

Signed-off-by: Joffrey F <joffrey@docker.com>

docker/utils/ports.py

@@ -67,6 +67,8 @@ def split_port(port):
 
     if len(parts) == 1:
         internal_port, = parts
+        if not internal_port:
+            _raise_invalid_port(port)
         return to_port_range(internal_port), None
     if len(parts) == 2:
         external_port, internal_port = parts

tests/integration/api_client_test.py

@@ -23,8 +23,6 @@ class InformationTest(BaseAPIIntegrationTest):
         self.assertIn('Containers', res)
         self.assertIn('Images', res)
         self.assertIn('Debug', res)
-        print(res)
-        self.fail()
 
 
 class LoadConfigTest(BaseAPIIntegrationTest):

tests/unit/utils_test.py

@@ -578,6 +578,9 @@ class PortsTest(unittest.TestCase):
         self.assertRaises(ValueError,
                           lambda: split_port("localhost:80:"))
 
+    def test_split_port_empty_string(self):
+        self.assertRaises(ValueError, lambda: split_port(""))
+
     def test_build_port_bindings_with_one_port(self):
         port_bindings = build_port_bindings(["127.0.0.1:1000:1000"])
         self.assertEqual(port_bindings["1000"], [("127.0.0.1", "1000")])