Add test for mock CSP (probably temporary)

tests/domain/test_mock_csp.py

@@ -0,0 +1,13 @@
+import pytest
+
+from atst.domain.csp import MockCloudProvider
+
+
+@pytest.fixture
+def mock_csp():
+    return MockCloudProvider(with_delay=False, with_failure=False)
+
+
+def test_create_environment(mock_csp: MockCloudProvider):
+    environment_id = mock_csp.create_environment({}, {}, {})
+    assert isinstance(environment_id, str)