tests/exec: add test for exit code from exec

Execs should return the exit code of the exec'd process, if it started.

Signed-off-by: Laura Brehm <[email protected]>

tests/integration/models_containers_test.py

@@ -353,6 +353,15 @@ def test_exec_run_success(self):
         assert exec_output[0] == 0
         assert exec_output[1] == b"hello\n"
 
+    def test_exec_run_error_code_from_exec(self):
+        client = docker.from_env(version=TEST_API_VERSION)
+        container = client.containers.run(
+            "alpine", "sleep 20'", detach=True
+        )
+        self.tmp_containers.append(container.id)
+        exec_output = container.exec_run("exit 42")
+        assert exec_output[0] == 42
+
     def test_exec_run_failed(self):
         client = docker.from_env(version=TEST_API_VERSION)
         container = client.containers.run(