fix: prevent false positive test file detection for projects in /tests/ folders

[Saga4]

Summary

Fixes incorrect test file filtering when a project is located inside a directory named "tests" (e.g., /home/user/tests/myproject).

Problem

When running codeflash on a project stored in a path containing /tests/, source files were incorrectly filtered as test files:

Ignored functions and files
└── Test functions removed: 1
INFO     Found 0 function to optimize

The issue was in is_test_file() which checked for /tests/ pattern in the full path instead of the relative path from project root.

Root Cause

# Before (buggy):
relative_path = file_lower  # Falls back to full path if condition fails
if project_root_str and file_lower.startswith(project_root_str.lower()):
    relative_path = file_lower[len(project_root_str):]
return any(pattern in relative_path for pattern in test_dir_patterns)

If the condition failed for any reason, relative_path remained the full path, which could contain /tests/ from parent directories.

Solution

# After (fixed):
if project_root_str and file_lower.startswith(project_root_str.lower()):
    relative_path = file_lower[len(project_root_str):]
    return any(pattern in relative_path for pattern in test_dir_patterns)
# If we can't compute relative path, don't check directory patterns
return False

Test Results

Before fix:

Ignored functions and files
└── Test functions removed: 1
INFO     Found 0 function to optimize

After fix:

• Function is discovered and processed correctly
• Tests are generated
• Optimization proceeds

Test plan

• Tested on n8n repo at /Users/saga4/orgs/tests/n8n
• Function compareValues is now discovered (was filtered before)
• Add unit test for this edge case

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