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Testing FilePreprocessor Text Handling and Indentation in cover-agent

This test suite validates the FilePreprocessor class functionality in handling different file types and code structures, with particular focus on Python file processing. It ensures proper text indentation and error handling across various file scenarios.

Test Coverage Overview

The test suite provides comprehensive coverage of the FilePreprocessor functionality.

Key areas tested include:

C file processing validation
Python file handling with different structures (functions, classes)
Comment handling and syntax error scenarios
Text indentation verification

Edge cases include commented class definitions and invalid syntax handling.

Implementation Analysis

The testing approach utilizes pytest’s fixture-like pattern with temporary file creation for isolated testing environments.

Technical implementation includes:

tempfile.NamedTemporaryFile for test file creation
textwrap.indent for indentation verification
File extension-based processing logic
Exception handling validation

Technical Details

Testing tools and configuration:

pytest as the testing framework
tempfile library for temporary file management
textwrap for text manipulation
Custom FilePreprocessor class implementation
Binary file writing for content creation

Best Practices Demonstrated

The test suite exemplifies strong testing practices through isolated test cases and comprehensive scenario coverage.

Notable practices include:

Clear test case naming and organization
Proper resource cleanup with temporary files
Explicit assertion messages
Comprehensive edge case handling
Independent test scenarios

codium-ai/cover-agent

tests/test_FilePreprocessor.py

            
import pytest
import tempfile
import textwrap
from cover_agent.FilePreprocessor import FilePreprocessor


class TestFilePreprocessor:
    # Test for a C file
    def test_c_file(self):
        with tempfile.NamedTemporaryFile(delete=False, suffix=".c") as tmp:
            preprocessor = FilePreprocessor(tmp.name)
            input_text = "Lorem ipsum dolor sit amet,
consectetur adipiscing elit,
sed do eiusmod tempor incididunt."
            processed_text = preprocessor.process_file(input_text)
            assert (
                processed_text == input_text
            ), "C file processing should not alter the text."

    # Test for a Python file with only a function
    def test_py_file_with_function_only(self):
        with tempfile.NamedTemporaryFile(delete=False, suffix=".py") as tmp:
            tmp.write(b"def function():
    pass
")
            tmp.close()
            preprocessor = FilePreprocessor(tmp.name)
            input_text = "Lorem ipsum dolor sit amet,
consectetur adipiscing elit,
sed do eiusmod tempor incididunt."
            processed_text = preprocessor.process_file(input_text)
            assert (
                processed_text == input_text
            ), "Python file without class should not alter the text."

    # Test for a Python file with a comment that looks like a class definition
    def test_py_file_with_commented_class(self):
        with tempfile.NamedTemporaryFile(delete=False, suffix=".py") as tmp:
            tmp.write(b"# class myPythonFile:
#    pass
")
            tmp.close()
            preprocessor = FilePreprocessor(tmp.name)
            input_text = "Lorem ipsum dolor sit amet,
consectetur adipiscing elit,
sed do eiusmod tempor incididunt."
            processed_text = preprocessor.process_file(input_text)
            assert (
                processed_text == input_text
            ), "Commented class definition should not trigger processing."

    # Test for a Python file with an actual class definition
    def test_py_file_with_class(self):
        with tempfile.NamedTemporaryFile(delete=False, suffix=".py") as tmp:
            tmp.write(b"class MyClass:
    def method(self):
        pass
")
            tmp.close()
            preprocessor = FilePreprocessor(tmp.name)
            input_text = "Lorem ipsum dolor sit amet,
consectetur adipiscing elit,
sed do eiusmod tempor incididunt."
            processed_text = preprocessor.process_file(input_text)
            expected_output = textwrap.indent(input_text, "    ")
            assert (
                processed_text == expected_output
            ), "Python file with class should indent the text."

    def test_py_file_with_syntax_error(self):
        with tempfile.NamedTemporaryFile(delete=False, suffix=".py") as tmp:
            tmp.write(b"def function(:
    pass
")  # Invalid syntax
            tmp.close()
            preprocessor = FilePreprocessor(tmp.name)
            input_text = "Lorem ipsum dolor sit amet,
consectetur adipiscing elit,
sed do eiusmod tempor incididunt."
            processed_text = preprocessor.process_file(input_text)
            assert (
                processed_text == input_text
            ), "Python file with syntax error should not alter the text and handle the exception gracefully."