delete unused lines in tests

python-threatexchange/threatexchange/tests/hashing/test_signal_type_index_2.py

@@ -9,11 +9,6 @@
 )
 
 
-@pytest.fixture
-def signal_type_index() -> SignalTypeIndex2:
-    return SignalTypeIndex2[int]()
-
-
 @pytest.fixture
 def empty_index():
     """Fixture for an empty index."""
@@ -91,12 +86,6 @@ def test_empty_index_query(empty_index):
     assert len(results) == 0
 
 
-def test_empty_index_properties(empty_index):
-    """Test properties of an empty index."""
-    assert len(empty_index._entries) == 0
-    assert len(empty_index._deduper) == 0
-
-
 def test_sample_set_exact_match(sample_index):
     """Test exact matches in sample set."""
     index, pdq_hashes = sample_index