testLoad method
void
testLoad({})
Implementation
void testLoad(
{String fileInput = '',
Parser parser = const Parser(),
Map<String, String> mergeWith = const {}}) {
clean();
final linesFromFile = fileInput.split('\n');
final linesFromMergeWith = mergeWith.entries
.map((entry) => "${entry.key}=${entry.value}")
.toList();
final allLines = linesFromMergeWith..addAll(linesFromFile);
final envEntries = parser.parse(allLines);
_envMap.addAll(envEntries);
_isInitialized = true;
}