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kivy/tests/test_logger.py

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+"""
+Logger tests
+============
+"""
+
+import pytest
+import pathlib
+import time
+
+
+@pytest.fixture
+def file_handler():
+    # restores handler to original state
+    from kivy.config import Config
+
+    log_dir = Config.get("kivy", "log_dir")
+    log_maxfiles = Config.get("kivy", "log_maxfiles")
+
+    try:
+        yield None
+    finally:
+        Config.set("kivy", "log_dir", log_dir)
+        Config.set("kivy", "log_maxfiles", log_maxfiles)
+
+
+@pytest.mark.parametrize('n', [0, 1, 5])
+def test_purge_logs(tmp_path, file_handler, n):
+    from kivy.config import Config
+    from kivy.logger import FileHandler
+
+    Config.set("kivy", "log_dir", str(tmp_path))
+    Config.set("kivy", "log_maxfiles", n)
+
+    # create the default file first so it gets deleted so names match
+    handler = FileHandler()
+    handler._configure()
+    open_file = pathlib.Path(handler.filename).name
+    # wait a little so the timestamps are different for different files
+    time.sleep(.05)
+
+    names = [f'log_{i}.txt' for i in range(n + 2)]
+    for name in names:
+        p = tmp_path / name
+        p.write_text('some data')
+        time.sleep(.05)
+
+    handler.purge_logs()
+
+    # files that should have remained after purge
+    expected_names = list(reversed(names))[:n]
+    files = {f.name for f in tmp_path.iterdir()}
+    if open_file in files:
+        # one of the remaining files is the current open log, remove it
+        files.remove(open_file)
+        if len(expected_names) == len(files) + 1:
+            # the open log may or may not have been counted in the remaining
+            # files, remove one from expected to match removed open file
+            expected_names = expected_names[:-1]
+
+    assert set(expected_names) == files