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Testing YAML Processing and Validation Features in pr-agent

This test suite validates YAML parsing and fixing functionality in the pr-agent repository, focusing on handling various YAML string formats and edge cases. The tests ensure robust YAML processing with different input scenarios.

Test Coverage Overview

The test suite provides comprehensive coverage of YAML parsing and fixing scenarios.

Key functionality tested includes:

Valid YAML string parsing
Adding ‘|-‘ to ‘relevant line’ entries
YAML snippet extraction
Handling empty YAML strings
Processing complex nested YAML structures

Implementation Analysis

The testing approach uses pytest fixtures and assertions to validate YAML processing outcomes. The implementation follows a systematic pattern of providing input YAML strings and comparing against expected parsed outputs.

Framework features utilized include:

Pytest assertion mechanisms
Class-based test organization
Isolated test cases for each scenario

Technical Details

Testing tools and configuration:

Pytest testing framework
Python’s native YAML processing capabilities
Custom try_fix_yaml utility function
Test isolation for independent case validation

Best Practices Demonstrated

The test suite demonstrates strong testing practices through clear test case organization and comprehensive scenario coverage.

Notable practices include:

Descriptive test method names
Clear expected vs actual result comparisons
Edge case handling
Systematic test organization

codium-ai/pr-agent

tests/unittest/test_try_fix_yaml.py

            

# Generated by CodiumAI
import pytest

from pr_agent.algo.utils import try_fix_yaml


class TestTryFixYaml:

    # The function successfully parses a valid YAML string.
    def test_valid_yaml(self):
        review_text = "key: value
"
        expected_output = {"key": "value"}
        assert try_fix_yaml(review_text) == expected_output

    # The function adds '|-' to 'relevant line:' if it is not already present and successfully parses the YAML string.
    def test_add_relevant_line(self):
        review_text = "relevant line: value: 3
"
        expected_output = {'relevant line': 'value: 3
'}
        assert try_fix_yaml(review_text) == expected_output

    # The function extracts YAML snippet
    def test_extract_snippet(self):
        review_text = '''\
Here is the answer in YAML format:

```yaml
name: John Smith
age: 35
```
'''
        expected_output = {'name': 'John Smith', 'age': 35}
        assert try_fix_yaml(review_text) == expected_output

    # The function removes the last line(s) of the YAML string and successfully parses the YAML string.
    def test_remove_last_line(self):
        review_text = "key: value
extra invalid line
"
        expected_output = {"key": "value"}
        assert try_fix_yaml(review_text) == expected_output

    # The YAML string is empty.
    def test_empty_yaml_fixed(self):
        review_text = ""
        assert try_fix_yaml(review_text) is None


    # The function extracts YAML snippet
    def test_no_initial_yaml(self):
        review_text = '''\
I suggest the following:

code_suggestions:
- relevant_file: |
    src/index.ts
  label: |
    best practice

- relevant_file: |
    src/index2.ts
  label: |
    enhancment
```

We can further improve the code by using the `const` keyword instead of `var` in the `src/index.ts` file.
'''
        expected_output = {'code_suggestions': [{'relevant_file': 'src/index.ts
', 'label': 'best practice
'}, {'relevant_file': 'src/index2.ts
', 'label': 'enhancment'}]}

        assert try_fix_yaml(review_text, first_key='code_suggestions', last_key='label') == expected_output

    def test_with_initial_yaml(self):
        review_text = '''\
I suggest the following:

```
code_suggestions:
- relevant_file: |
    src/index.ts
  label: |
    best practice

- relevant_file: |
    src/index2.ts
  label: |
    enhancment
```

We can further improve the code by using the `const` keyword instead of `var` in the `src/index.ts` file.
'''
        expected_output = {'code_suggestions': [{'relevant_file': 'src/index.ts
', 'label': 'best practice
'}, {'relevant_file': 'src/index2.ts
', 'label': 'enhancment'}]}
        assert try_fix_yaml(review_text, first_key='code_suggestions', last_key='label') == expected_output