Initial commit

tests/test_copy_logic.py

@@ -0,0 +1,95 @@
+import os
+import time
+from pathlib import Path
+
+import pytest
+
+from main import find_latest_file_in_folder, should_copy_file, compute_file_checksum, verify_copy
+
+
+
+def _touch(path: Path, mtime: float) -> None:
+    path.write_text('data', encoding='utf-8')
+    os.utime(path, (mtime, mtime))
+
+
+
+def test_find_latest_file_returns_none_for_missing_folder(tmp_path):
+    missing = tmp_path / 'missing'
+    assert find_latest_file_in_folder(str(missing)) is None
+
+
+
+def test_find_latest_file_picks_newest(tmp_path):
+    folder = tmp_path / 'src'
+    folder.mkdir()
+
+    now = time.time()
+    older = folder / 'older.bak'
+    newer = folder / 'newer.bak'
+    other = folder / 'other.sql'
+
+    _touch(older, now - 10)
+    _touch(newer, now - 5)
+    _touch(other, now - 1)
+
+    latest = find_latest_file_in_folder(str(folder))
+    assert latest is not None
+    assert latest.name == 'other.sql'
+
+
+
+def test_should_copy_file_when_target_missing(tmp_path):
+    src = tmp_path / 'src.bak'
+    src.write_text('x', encoding='utf-8')
+    dst = tmp_path / 'dst.bak'
+
+    assert should_copy_file(src, dst) is True
+
+
+
+def test_should_copy_file_when_source_newer(tmp_path):
+    now = time.time()
+    src = tmp_path / 'src.bak'
+    dst = tmp_path / 'dst.bak'
+
+    _touch(dst, now - 10)
+    _touch(src, now)
+
+    assert should_copy_file(src, dst) is True
+
+
+
+def test_should_copy_file_when_target_newer_or_equal(tmp_path):
+    now = time.time()
+    src = tmp_path / 'src.bak'
+    dst = tmp_path / 'dst.bak'
+
+    _touch(src, now)
+    _touch(dst, now)
+
+    assert should_copy_file(src, dst) is False
+
+
+def test_compute_file_checksum_stable(tmp_path):
+    src = tmp_path / 'a.bak'
+    src.write_text('hello', encoding='utf-8')
+    c1 = compute_file_checksum(src)
+    c2 = compute_file_checksum(src)
+    assert c1 == c2
+
+
+def test_verify_copy_true_for_equal_files(tmp_path):
+    src = tmp_path / 'src.bak'
+    dst = tmp_path / 'dst.bak'
+    src.write_text('data', encoding='utf-8')
+    dst.write_text('data', encoding='utf-8')
+    assert verify_copy(src, dst) is True
+
+
+def test_verify_copy_false_for_different_files(tmp_path):
+    src = tmp_path / 'src.bak'
+    dst = tmp_path / 'dst.bak'
+    src.write_text('data1', encoding='utf-8')
+    dst.write_text('data2', encoding='utf-8')
+    assert verify_copy(src, dst) is False