getLibPath method
Maps a test file back to its corresponding source file.
Implementation
String getLibPath(String testPath) {
final relativePath =
p.relative(testPath, from: p.join(projectRoot, 'test'));
final fileName =
p.basenameWithoutExtension(relativePath).replaceAll('_test', '');
final directory = p.dirname(relativePath);
return p.join(projectRoot, 'lib', directory, '$fileName.dart');
}