Add test got method speicifc routing

tests/test_litellm/proxy/pass_through_endpoints/test_method_specific_routing.py

@@ -0,0 +1,155 @@
+"""
+Test method-specific routing for pass-through endpoints.
+
+This test demonstrates the ability to configure different targets
+for the same path but different HTTP methods.
+"""
+
+import pytest
+
+from litellm.proxy._types import PassThroughGenericEndpoint
+
+
+def test_pass_through_endpoint_with_methods():
+    """Test creating pass-through endpoints with specific methods"""
+    
+    # Create endpoint for GET /azure/kb
+    get_endpoint = PassThroughGenericEndpoint(
+        id="get-azure-kb",
+        path="/azure/kb",
+        target="https://api1.example.com/knowledge-base",
+        methods=["GET"],
+        headers={"Authorization": "Bearer token1"},
+    )
+    
+    assert get_endpoint.path == "/azure/kb"
+    assert get_endpoint.methods == ["GET"]
+    assert get_endpoint.target == "https://api1.example.com/knowledge-base"
+    
+    # Create endpoint for POST /azure/kb
+    post_endpoint = PassThroughGenericEndpoint(
+        id="post-azure-kb",
+        path="/azure/kb",
+        target="https://api2.example.com/knowledge-base",
+        methods=["POST"],
+        headers={"Authorization": "Bearer token2"},
+    )
+    
+    assert post_endpoint.path == "/azure/kb"
+    assert post_endpoint.methods == ["POST"]
+    assert post_endpoint.target == "https://api2.example.com/knowledge-base"
+    
+    # These should be different endpoints despite same path
+    assert get_endpoint.id != post_endpoint.id
+    assert get_endpoint.target != post_endpoint.target
+
+
+def test_pass_through_endpoint_multiple_methods():
+    """Test creating endpoint with multiple methods"""
+    
+    endpoint = PassThroughGenericEndpoint(
+        id="multi-method",
+        path="/azure/kb",
+        target="https://api.example.com/kb",
+        methods=["GET", "POST", "PUT"],
+        headers={},
+    )
+    
+    assert len(endpoint.methods) == 3
+    assert "GET" in endpoint.methods
+    assert "POST" in endpoint.methods
+    assert "PUT" in endpoint.methods
+
+
+def test_pass_through_endpoint_no_methods_backward_compatibility():
+    """Test that endpoints without methods field work (backward compatibility)"""
+    
+    # When methods is None, all methods should be supported
+    endpoint = PassThroughGenericEndpoint(
+        id="all-methods",
+        path="/azure/kb",
+        target="https://api.example.com/kb",
+        headers={},
+    )
+    
+    assert endpoint.methods is None  # Default is None for backward compatibility
+
+
+def test_pass_through_endpoint_serialization():
+    """Test that endpoints with methods can be serialized/deserialized"""
+    
+    endpoint = PassThroughGenericEndpoint(
+        id="test-endpoint",
+        path="/test",
+        target="https://api.example.com",
+        methods=["GET", "POST"],
+        headers={"key": "value"},
+        cost_per_request=0.5,
+    )
+    
+    # Serialize to dict
+    endpoint_dict = endpoint.model_dump()
+    assert endpoint_dict["methods"] == ["GET", "POST"]
+    
+    # Deserialize from dict
+    restored_endpoint = PassThroughGenericEndpoint(**endpoint_dict)
+    assert restored_endpoint.methods == ["GET", "POST"]
+    assert restored_endpoint.path == "/test"
+    assert restored_endpoint.target == "https://api.example.com"
+
+
+def test_route_key_generation_with_methods():
+    """Test that route keys include methods for uniqueness"""
+    from litellm.proxy.pass_through_endpoints.pass_through_endpoints import (
+        InitPassThroughEndpointHelpers,
+    )
+
+    # Simulate how route keys are generated
+    endpoint_id_1 = "endpoint-1"
+    path = "/azure/kb"
+    methods_1 = ["GET"]
+    methods_str_1 = ",".join(sorted(methods_1))
+    route_key_1 = f"{endpoint_id_1}:exact:{path}:{methods_str_1}"
+    
+    endpoint_id_2 = "endpoint-2"
+    methods_2 = ["POST"]
+    methods_str_2 = ",".join(sorted(methods_2))
+    route_key_2 = f"{endpoint_id_2}:exact:{path}:{methods_str_2}"
+    
+    # Keys should be different even though path is the same
+    assert route_key_1 != route_key_2
+    assert route_key_1 == "endpoint-1:exact:/azure/kb:GET"
+    assert route_key_2 == "endpoint-2:exact:/azure/kb:POST"
+
+
+def test_config_yaml_example():
+    """
+    Example configuration for config.yaml showing method-specific routing:
+    
+    general_settings:
+      pass_through_endpoints:
+        # GET endpoint for retrieving knowledge base
+        - id: "get-azure-kb"
+          path: "/azure/kb"
+          target: "https://read-api.example.com/kb"
+          methods: ["GET"]
+          headers:
+            Authorization: "bearer os.environ/READ_API_KEY"
+        
+        # POST endpoint for creating knowledge base entries
+        - id: "post-azure-kb"
+          path: "/azure/kb"
+          target: "https://write-api.example.com/kb"
+          methods: ["POST"]
+          headers:
+            Authorization: "bearer os.environ/WRITE_API_KEY"
+        
+        # PUT endpoint for updating knowledge base
+        - id: "put-azure-kb"
+          path: "/azure/kb"
+          target: "https://update-api.example.com/kb"
+          methods: ["PUT"]
+          headers:
+            Authorization: "bearer os.environ/UPDATE_API_KEY"
+    """
+    pass