Add class for existing files

tests/unit/utils/test_ExistingFile.py

@@ -0,0 +1,22 @@
+from src.jcloud_docsgen.utils import ExistingFile
+import pytest
+import pathlib
+
+@pytest.mark.parametrize('path,expected', [
+    ('tests/unit/utils/test_file', 'tests/unit/utils/test_file'),
+    ('tests/unit/utils/test_symlink', 'tests/unit/utils/test_symlink'),
+])
+def test_ExistingDirectory(path, expected):
+    assert ExistingFile(path).as_posix() == expected
+
+@pytest.mark.parametrize('path,expected_exception,expected_exception_message', [
+    ('tests/unit/utils/does_not_exist', FileNotFoundError, '[Errno 2] no such file or directory: \'tests/unit/utils/does_not_exist\''),
+    ('', FileNotFoundError, '[Errno 2] no such file or directory: \'\''),
+    ('tests/unit/utils/test_directory', IsADirectoryError, '[Errno 21] is a directory: \'tests/unit/utils/test_directory\''),
+    ('.', IsADirectoryError, '[Errno 21] is a directory: \'.\''),
+    ('./', IsADirectoryError, '[Errno 21] is a directory: \'./\''),
+])
+def test_ExistingDirectory_exceptions(path, expected_exception, expected_exception_message):
+    with pytest.raises(expected_exception) as exc_info:
+        ExistingFile(path)
+    assert str(exc_info.value) == expected_exception_message