Add ctime attribute and test

tests/test_snapshot.py

@@ -4,8 +4,35 @@
 Unit tests for the rbackup.struct.snapshot module.
 """
 
+import unittest
+from pathlib import Path
+from unittest.mock import DEFAULT, patch
+
+from rbackup.struct.snapshot import Snapshot
+
 # ========== Constants ==========
 TESTING_PACKAGE = "rbackup.struct"
 TESTING_MODULE = f"{TESTING_PACKAGE}.snapshot"
 
-# ========== Unit Tests ==========
+
+# ========== Tests ==========
+class TestSnapshotProperties(unittest.TestCase):
+    def setUp(self):
+        self.patched_path = patch.multiple(
+            Path, exists=DEFAULT, mkdir=DEFAULT, symlink_to=DEFAULT, touch=DEFAULT
+        )
+        self.patched_metadata = patch.multiple(
+            Snapshot, read_metadata=DEFAULT, write_metadata=DEFAULT
+        )
+
+        self.mocked_path = self.patched_path.start()
+        self.mocked_metadata = self.patched_metadata.start()
+
+        self.mocked_path["exists"].return_value = False
+
+    def test_ctime_returns_str(self):
+        self.assertIsInstance(Snapshot("/tmp/backup/snapshot").ctime, str)
+
+    def tearDown(self):
+        self.patched_path.stop()
+        self.patched_metadata.stop()