Add test_modulepickling_change_cache_dir

test/test_cache.py

@@ -0,0 +1,30 @@
+from jedi import settings
+from jedi.cache import ParserCacheItem, _ModulePickling
+
+
+ModulePickling = _ModulePickling()
+
+
+def test_modulepickling_change_cache_dir(monkeypatch, tmpdir):
+    """
+    ModulePickling should not save old cache when cache_directory is changed.
+
+    See: `#168 <https://github.com/davidhalter/jedi/pull/168>`_
+    """
+    dir_1 = str(tmpdir.mkdir('first'))
+    dir_2 = str(tmpdir.mkdir('second'))
+
+    item_1 = ParserCacheItem('fake parser 1')
+    item_2 = ParserCacheItem('fake parser 2')
+    path_1 = 'fake path 1'
+    path_2 = 'fake path 2'
+
+    monkeypatch.setattr(settings, 'cache_directory', dir_1)
+    ModulePickling.save_module(path_1, item_1)
+    cached = ModulePickling.load_module(path_1, item_1.change_time - 1)
+    assert cached == item_1.parser
+
+    monkeypatch.setattr(settings, 'cache_directory', dir_2)
+    ModulePickling.save_module(path_2, item_2)
+    cached = ModulePickling.load_module(path_1, item_1.change_time - 1)
+    assert cached is None