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Validating Line Number Detection Logic in PR-Agent Patch Processing

This test suite validates the line number finding functionality in file patches for the PR Agent project. It focuses on testing the find_line_number_of_relevant_line_in_file function which locates specific lines within file diffs and returns their positions.

Test Coverage Overview

The test suite provides comprehensive coverage for line number detection in file patches:

Successful line matches in patches
Similar line detection using difflib
Edge cases including non-existent lines and files
Empty line handling
Deleted line scenarios

Integration points include the FilePatchInfo data structure and patch parsing functionality.

Implementation Analysis

The testing approach uses pytest fixtures to validate different patch scenarios:

Tests implement a systematic pattern of providing input patches, target files/lines, and expected position outputs. Each test case utilizes the FilePatchInfo structure and validates both patch position and absolute file position returns.

Technical Details

Testing Framework: pytest
Key Components: FilePatchInfo class, difflib integration
Input Data: File patches in unified diff format
Return Format: Tuple of (patch_position, absolute_position)

Best Practices Demonstrated

The test suite demonstrates several testing best practices:

Comprehensive edge case coverage
Clear test case naming and documentation
Consistent test structure and assertions
Isolated test scenarios
Proper use of test data structures

codium-ai/pr-agent

tests/unittest/test_find_line_number_of_relevant_line_in_file.py

            

# Generated by CodiumAI
import pytest

from pr_agent.algo.types import FilePatchInfo
from pr_agent.algo.utils import find_line_number_of_relevant_line_in_file


class TestFindLineNumberOfRelevantLineInFile:
    # Tests that the function returns the correct line number and absolute position when the relevant line is found in the patch
    def test_relevant_line_found_in_patch(self):
        diff_files = [
            FilePatchInfo(base_file='file1', head_file='file1', patch='@@ -1,1 +1,2 @@
-line1
+line2
+relevant_line
', filename='file1')
        ]
        relevant_file = 'file1'
        relevant_line_in_file = 'relevant_line'
        expected = (3, 2) # (position in patch, absolute_position in new file)
        assert find_line_number_of_relevant_line_in_file(diff_files, relevant_file, relevant_line_in_file) == expected

    # Tests that the function returns the correct line number and absolute position when a similar line is found using difflib
    def test_similar_line_found_using_difflib(self):
        diff_files = [
            FilePatchInfo(base_file='file1', head_file='file1', patch='@@ -1,1 +1,2 @@
-line1
+relevant_line in file similar match
', filename='file1')
        ]
        relevant_file = 'file1'
        relevant_line_in_file = '+relevant_line in file similar match ' # note the space at the end. This is to simulate a similar line found using difflib
        expected = (2, 1)
        assert find_line_number_of_relevant_line_in_file(diff_files, relevant_file, relevant_line_in_file) == expected

    # Tests that the function returns (-1, -1) when the relevant line is not found in the patch and no similar line is found using difflib
    def test_relevant_line_not_found(self):
        diff_files = [
            FilePatchInfo(base_file='file1', head_file='file1', patch='@@ -1,1 +1,2 @@
-line1
+relevant_line
', filename='file1')
        ]
        relevant_file = 'file1'
        relevant_line_in_file = 'not_found'
        expected = (-1, -1)
        assert find_line_number_of_relevant_line_in_file(diff_files, relevant_file, relevant_line_in_file) == expected

    # Tests that the function returns (-1, -1) when the relevant file is not found in any of the patches
    def test_relevant_file_not_found(self):
        diff_files = [
            FilePatchInfo(base_file='file1', head_file='file1', patch='@@ -1,1 +1,2 @@
-line1
+relevant_line
', filename='file2')
        ]
        relevant_file = 'file1'
        relevant_line_in_file = 'relevant_line'
        expected = (-1, -1)
        assert find_line_number_of_relevant_line_in_file(diff_files, relevant_file, relevant_line_in_file) == expected

    # Tests that the function returns (-1, -1) when the relevant_line_in_file is an empty string
    def test_empty_relevant_line(self):
        diff_files = [
            FilePatchInfo(base_file='file1', head_file='file1', patch='@@ -1,1 +1,2 @@
-line1
+relevant_line
', filename='file1')
        ]
        relevant_file = 'file1'
        relevant_line_in_file = ''
        expected = (0, 0)
        assert find_line_number_of_relevant_line_in_file(diff_files, relevant_file, relevant_line_in_file) == expected

    # Tests that the function returns (-1, -1) when the relevant_line_in_file is found in the patch but it is a deleted line
    def test_relevant_line_found_but_deleted(self):
        diff_files = [
            FilePatchInfo(base_file='file1', head_file='file1', patch='@@ -1,2 +1,1 @@
-line1
-relevant_line
', filename='file1')
        ]
        relevant_file = 'file1'
        relevant_line_in_file = 'relevant_line'
        expected = (-1, -1)
        assert find_line_number_of_relevant_line_in_file(diff_files, relevant_file, relevant_line_in_file) == expected