[test][docker] Add test for entrypoint property

beat/core/test/test_docker.py

@@ -164,6 +164,26 @@ class WorkdirTest(NoDiscoveryTests):
                 self.assertEqual(content, "8.4\n")
 
 
+class EntrypointTest(NoDiscoveryTests):
+
+    @slow
+    def test_entrypoint(self):
+        """Test that the entrypoint property is correctly used.
+        """
+
+        container = self.host.create_container('debian:8.4', ["42"])
+        container.set_entrypoint('echo')
+
+        self.host.start(container)
+        status = self.host.wait(container)
+        logs = self.host.logs(container)
+        if status != 0:
+            print(logs)
+
+        self.assertEqual(status, 0)
+        self.assertEqual(logs, "42\n")
+
+
 class AsyncTest(NoDiscoveryTests):
 
     @slow