diff --git a/tests/integration_tests/test_client.py b/tests/integration_tests/test_client.py
index 7d5c03d..ef78025 100644
--- a/tests/integration_tests/test_client.py
+++ b/tests/integration_tests/test_client.py
@@ -1,6 +1,8 @@
+from datetime import timedelta
 import pytest
-
 from cadence.api.v1.service_domain_pb2 import DescribeDomainRequest, DescribeDomainResponse
+from cadence.api.v1.service_workflow_pb2 import DescribeWorkflowExecutionRequest
+from cadence.api.v1.common_pb2 import WorkflowExecution
 from cadence.error import EntityNotExistsError
 from tests.integration_tests.helper import CadenceHelper, DOMAIN_NAME
 
@@ -16,3 +18,123 @@ async def test_domain_not_exists(helper: CadenceHelper):
     with pytest.raises(EntityNotExistsError):
         async with helper.client() as client:
             await client.domain_stub.DescribeDomain(DescribeDomainRequest(name="unknown-domain"))
+
+# Worker Stub Tests
+
+@pytest.mark.usefixtures("helper")
+async def test_worker_stub_accessible(helper: CadenceHelper):
+    """Test that worker_stub is properly initialized and accessible."""
+    async with helper.client() as client:
+        assert client.worker_stub is not None
+        # Verify it's the correct type
+        from cadence.api.v1.service_worker_pb2_grpc import WorkerAPIStub
+        assert isinstance(client.worker_stub, WorkerAPIStub)
+
+# Workflow Stub Tests
+
+@pytest.mark.usefixtures("helper")
+async def test_workflow_stub_accessible(helper: CadenceHelper):
+    """Test that workflow_stub is properly initialized and accessible."""
+    async with helper.client() as client:
+        assert client.workflow_stub is not None
+        # Verify it's the correct type
+        from cadence.api.v1.service_workflow_pb2_grpc import WorkflowAPIStub
+        assert isinstance(client.workflow_stub, WorkflowAPIStub)
+
+@pytest.mark.usefixtures("helper")
+async def test_workflow_stub_start_workflow(helper: CadenceHelper):
+    """Test starting a workflow execution via workflow_stub.
+    
+    This test verifies that we can start a workflow execution using the
+    client's start_workflow method, which uses workflow_stub internally.
+    """
+    async with helper.client() as client:
+        # Start a simple workflow
+        execution = await client.start_workflow(
+            "test-workflow-type",
+            task_list="test-task-list",
+            execution_start_to_close_timeout=timedelta(minutes=5),
+            workflow_id="test-workflow-id-123",
+        )
+        
+        # Verify we got a valid execution response
+        assert execution is not None
+        assert execution.workflow_id == "test-workflow-id-123"
+        assert execution.run_id is not None
+        assert len(execution.run_id) > 0
+
+@pytest.mark.usefixtures("helper")
+async def test_workflow_stub_describe_workflow(helper: CadenceHelper):
+    """Test describing a workflow execution via workflow_stub.
+    
+    This test verifies that we can query workflow execution details after
+    starting a workflow.
+    """
+    async with helper.client() as client:
+        # First start a workflow
+        execution = await client.start_workflow(
+            "test-workflow-type-describe",
+            task_list="test-task-list-describe",
+            execution_start_to_close_timeout=timedelta(minutes=5),
+            workflow_id="test-workflow-describe-456",
+        )
+        
+        # Now describe the workflow execution
+        describe_request = DescribeWorkflowExecutionRequest(
+            domain=DOMAIN_NAME,
+            workflow_execution=WorkflowExecution(
+                workflow_id=execution.workflow_id,
+                run_id=execution.run_id,
+            ),
+        )
+        
+        response = await client.workflow_stub.DescribeWorkflowExecution(describe_request)
+        
+        # Print the run_id for debugging
+        print(f"Workflow run_id: {execution.run_id}")
+        
+        # Verify we got a valid response
+        assert response is not None
+        assert response.workflow_execution_info is not None
+        assert response.workflow_execution_info.workflow_execution.workflow_id == execution.workflow_id
+        assert response.workflow_execution_info.workflow_execution.run_id == execution.run_id
+
+# Combined Test
+
+@pytest.mark.usefixtures("helper")
+async def test_all_stubs_accessible(helper: CadenceHelper):
+    """Test that all three stubs (domain, worker, workflow) are accessible.
+    
+    This is a comprehensive connectivity test that verifies the client
+    can access all three main API stubs.
+    """
+    async with helper.client() as client:
+        # Verify all stubs are initialized
+        assert client.domain_stub is not None
+        assert client.worker_stub is not None
+        assert client.workflow_stub is not None
+        
+        # Verify they are the correct types
+        from cadence.api.v1.service_domain_pb2_grpc import DomainAPIStub
+        from cadence.api.v1.service_worker_pb2_grpc import WorkerAPIStub
+        from cadence.api.v1.service_workflow_pb2_grpc import WorkflowAPIStub
+        
+        assert isinstance(client.domain_stub, DomainAPIStub)
+        assert isinstance(client.worker_stub, WorkerAPIStub)
+        assert isinstance(client.workflow_stub, WorkflowAPIStub)
+        
+        # Test basic connectivity with each stub
+        # Domain stub - describe domain
+        domain_response = await client.domain_stub.DescribeDomain(
+            DescribeDomainRequest(name=DOMAIN_NAME)
+        )
+        assert domain_response.domain.name == DOMAIN_NAME
+        
+        # Workflow stub - start workflow
+        execution = await client.start_workflow(
+            "connectivity-test-workflow",
+            task_list="connectivity-test-task-list",
+            execution_start_to_close_timeout=timedelta(minutes=5),
+            workflow_id="connectivity-test-workflow-789",
+        )
+        assert execution.workflow_id == "connectivity-test-workflow-789"