def test_cache_flush():
c = FileCache()
c.add("123", ["1", "2"])
c.add("326", ["3", "2"])
c.flush()
assert c.contains("123") == False
assert c.contains("326") == False
def test__cache_contains_in_new_cache():
c1 = FileCache()
c1.add("123", [])
assert c1.contains("123") == True
c2 = FileCache()
assert c2.contains("123") == True
c1.flush()
c2.flush()
