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| 1 | +# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| 2 | +# |
| 3 | +# Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +# you may not use this file except in compliance with the License. |
| 5 | +# You may obtain a copy of the License at |
| 6 | +# |
| 7 | +# http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | +# |
| 9 | +# Unless required by applicable law or agreed to in writing, software |
| 10 | +# distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | +# See the License for the specific language governing permissions and |
| 13 | +# limitations under the License. |
| 14 | + |
| 15 | +"""Tests for _initialize_client error handling.""" |
| 16 | + |
| 17 | +import httpx |
| 18 | +import pytest |
| 19 | +from mcp import McpError |
| 20 | +from mcp.types import ErrorData, JSONRPCError, JSONRPCResponse |
| 21 | +from mcp_proxy_for_aws.server import _initialize_client |
| 22 | +from unittest.mock import AsyncMock, Mock, patch |
| 23 | + |
| 24 | + |
| 25 | +@pytest.mark.asyncio |
| 26 | +async def test_successful_initialization(): |
| 27 | + """Test successful client initialization.""" |
| 28 | + mock_transport = Mock() |
| 29 | + mock_client = Mock() |
| 30 | + |
| 31 | + with patch('mcp_proxy_for_aws.server.Client') as mock_client_class: |
| 32 | + mock_client_class.return_value.__aenter__ = AsyncMock(return_value=mock_client) |
| 33 | + mock_client_class.return_value.__aexit__ = AsyncMock(return_value=None) |
| 34 | + |
| 35 | + async with _initialize_client(mock_transport) as client: |
| 36 | + assert client == mock_client |
| 37 | + |
| 38 | + |
| 39 | +@pytest.mark.asyncio |
| 40 | +async def test_http_error_with_jsonrpc_error(capsys): |
| 41 | + """Test HTTPStatusError with JSONRPCError response.""" |
| 42 | + mock_transport = Mock() |
| 43 | + error_data = ErrorData(code=-32600, message='Invalid Request') |
| 44 | + jsonrpc_error = JSONRPCError(jsonrpc='2.0', id=1, error=error_data) |
| 45 | + |
| 46 | + mock_response = Mock() |
| 47 | + mock_response.aread = AsyncMock(return_value=jsonrpc_error.model_dump_json().encode()) |
| 48 | + |
| 49 | + http_error = httpx.HTTPStatusError('error', request=Mock(), response=mock_response) |
| 50 | + |
| 51 | + with patch('mcp_proxy_for_aws.server.Client') as mock_client_class: |
| 52 | + mock_client_class.return_value.__aenter__ = AsyncMock(side_effect=http_error) |
| 53 | + |
| 54 | + with pytest.raises(httpx.HTTPStatusError): |
| 55 | + async with _initialize_client(mock_transport): |
| 56 | + pass |
| 57 | + |
| 58 | + captured = capsys.readouterr() |
| 59 | + assert 'Invalid Request' in captured.out |
| 60 | + |
| 61 | + |
| 62 | +@pytest.mark.asyncio |
| 63 | +async def test_http_error_with_jsonrpc_response(capsys): |
| 64 | + """Test HTTPStatusError with JSONRPCResponse.""" |
| 65 | + mock_transport = Mock() |
| 66 | + jsonrpc_response = JSONRPCResponse(jsonrpc='2.0', id=1, result={'status': 'error'}) |
| 67 | + |
| 68 | + mock_response = Mock() |
| 69 | + mock_response.aread = AsyncMock(return_value=jsonrpc_response.model_dump_json().encode()) |
| 70 | + |
| 71 | + http_error = httpx.HTTPStatusError('error', request=Mock(), response=mock_response) |
| 72 | + |
| 73 | + with patch('mcp_proxy_for_aws.server.Client') as mock_client_class: |
| 74 | + mock_client_class.return_value.__aenter__ = AsyncMock(side_effect=http_error) |
| 75 | + |
| 76 | + with pytest.raises(httpx.HTTPStatusError): |
| 77 | + async with _initialize_client(mock_transport): |
| 78 | + pass |
| 79 | + |
| 80 | + captured = capsys.readouterr() |
| 81 | + assert '"result":{"status":"error"}' in captured.out |
| 82 | + |
| 83 | + |
| 84 | +@pytest.mark.asyncio |
| 85 | +async def test_http_error_with_invalid_json(): |
| 86 | + """Test HTTPStatusError with invalid JSON response.""" |
| 87 | + mock_transport = Mock() |
| 88 | + |
| 89 | + mock_response = Mock() |
| 90 | + mock_response.aread = AsyncMock(return_value=b'invalid json') |
| 91 | + |
| 92 | + http_error = httpx.HTTPStatusError('error', request=Mock(), response=mock_response) |
| 93 | + |
| 94 | + with patch('mcp_proxy_for_aws.server.Client') as mock_client_class: |
| 95 | + mock_client_class.return_value.__aenter__ = AsyncMock(side_effect=http_error) |
| 96 | + |
| 97 | + with pytest.raises(httpx.HTTPStatusError): |
| 98 | + async with _initialize_client(mock_transport): |
| 99 | + pass |
| 100 | + |
| 101 | + |
| 102 | +@pytest.mark.asyncio |
| 103 | +async def test_http_error_with_non_jsonrpc_message(): |
| 104 | + """Test HTTPStatusError with non-JSONRPCError/Response message.""" |
| 105 | + mock_transport = Mock() |
| 106 | + |
| 107 | + mock_response = Mock() |
| 108 | + mock_response.aread = AsyncMock(return_value=b'{"jsonrpc":"2.0","method":"test"}') |
| 109 | + |
| 110 | + http_error = httpx.HTTPStatusError('error', request=Mock(), response=mock_response) |
| 111 | + |
| 112 | + with patch('mcp_proxy_for_aws.server.Client') as mock_client_class: |
| 113 | + mock_client_class.return_value.__aenter__ = AsyncMock(side_effect=http_error) |
| 114 | + |
| 115 | + with pytest.raises(httpx.HTTPStatusError): |
| 116 | + async with _initialize_client(mock_transport): |
| 117 | + pass |
| 118 | + |
| 119 | + |
| 120 | +@pytest.mark.asyncio |
| 121 | +async def test_http_error_response_read_failure(): |
| 122 | + """Test HTTPStatusError when response.aread() fails.""" |
| 123 | + mock_transport = Mock() |
| 124 | + |
| 125 | + mock_response = Mock() |
| 126 | + mock_response.aread = AsyncMock(side_effect=Exception('Read failed')) |
| 127 | + |
| 128 | + http_error = httpx.HTTPStatusError('error', request=Mock(), response=mock_response) |
| 129 | + |
| 130 | + with patch('mcp_proxy_for_aws.server.Client') as mock_client_class: |
| 131 | + mock_client_class.return_value.__aenter__ = AsyncMock(side_effect=http_error) |
| 132 | + |
| 133 | + with pytest.raises(httpx.HTTPStatusError): |
| 134 | + async with _initialize_client(mock_transport): |
| 135 | + pass |
| 136 | + |
| 137 | + |
| 138 | +@pytest.mark.asyncio |
| 139 | +async def test_generic_error_with_mcp_error_cause(capsys): |
| 140 | + """Test generic exception with McpError as cause.""" |
| 141 | + mock_transport = Mock() |
| 142 | + error_data = ErrorData(code=-32601, message='Method not found') |
| 143 | + mcp_error = McpError(error_data) |
| 144 | + generic_error = Exception('Wrapper error') |
| 145 | + generic_error.__cause__ = mcp_error |
| 146 | + |
| 147 | + with patch('mcp_proxy_for_aws.server.Client') as mock_client_class: |
| 148 | + mock_client_class.return_value.__aenter__ = AsyncMock(side_effect=generic_error) |
| 149 | + |
| 150 | + with pytest.raises(Exception): |
| 151 | + async with _initialize_client(mock_transport): |
| 152 | + pass |
| 153 | + |
| 154 | + captured = capsys.readouterr() |
| 155 | + assert 'Method not found' in captured.out |
| 156 | + assert '"code":-32601' in captured.out |
| 157 | + |
| 158 | + |
| 159 | +@pytest.mark.asyncio |
| 160 | +async def test_generic_error_without_mcp_error_cause(capsys): |
| 161 | + """Test generic exception without McpError cause.""" |
| 162 | + mock_transport = Mock() |
| 163 | + generic_error = Exception('Generic error') |
| 164 | + |
| 165 | + with patch('mcp_proxy_for_aws.server.Client') as mock_client_class: |
| 166 | + mock_client_class.return_value.__aenter__ = AsyncMock(side_effect=generic_error) |
| 167 | + |
| 168 | + with pytest.raises(Exception): |
| 169 | + async with _initialize_client(mock_transport): |
| 170 | + pass |
| 171 | + |
| 172 | + captured = capsys.readouterr() |
| 173 | + assert 'Generic error' in captured.out |
| 174 | + assert '"code":-32000' in captured.out |
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