GraphQL: Improve testing

[amotl]

@coderabbitai recommended on another PR:

💡 Codebase verification

🛠️ Refactor suggestion

After reviewing the implementation, I can now provide a final response about the test coverage concerns:

Additional test coverage is needed for error handling and advanced GraphQL features

The implementation in responder/ext/graphql/__init__.py shows support for:

• Variable handling (variables parameter in execution)
• Operation names
• Multiple query input methods (JSON, query params, request body)
• Error formatting
• Content negotiation

Current tests don't cover these implemented features. Missing test scenarios:

• Error responses for malformed queries
• Variable substitution in queries
• Operation name selection
• Different input methods (JSON body vs query params)
• Error format validation
• Content negotiation edge cases

🔗 Analysis chain

Consider adding tests for missing scenarios.

The test suite could benefit from additional test cases to ensure comprehensive coverage.

Consider adding tests for:

1. Schema introspection queries
2. Error handling of malformed queries
3. Variable handling in queries
4. Field arguments validation
5. Custom scalar types (if used)

Let's verify the current test coverage:

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Let me check the GraphQL implementation to better understand what features need test coverage.

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Let me try to locate the GraphQL implementation files first.

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Let's check the implementation in the GraphQL extension directory.

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Let me check the templates file to complete the implementation review.

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Check for existing test coverage in the codebase
rg -l "test.*graphql" tests/

Length of output: 52

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Script:

#!/bin/bash
# Check GraphQL implementation
cat responder/ext/graphql.py

Length of output: 87

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Script:

#!/bin/bash
# Find GraphQL related files
fd graphql

Length of output: 57

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Script:

#!/bin/bash
# Check GraphQL implementation files
ls -la responder/ext/graphql/
cat responder/ext/graphql/__init__.py

Length of output: 2729

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Script:

#!/bin/bash
# Check GraphQL templates
cat responder/ext/graphql/templates.py

Length of output: 5040

Originally posted by @coderabbitai[bot] in #554 (comment)