add test

gazelle/python/testdata/remove_invalid_library/BUILD.in

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+load("@rules_python//python:defs.bzl", "py_library")
+
+py_library(
+    name = "remove_invalid_library",
+    srcs = ["__init__.py"],
+    visibility = ["//:__subpackages__"],
+)

gazelle/python/testdata/remove_invalid_library/README.md

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+# Remove invalid
+
+This test case asserts that `py_library` should be deleted if invalid.

gazelle/python/testdata/remove_invalid_library/WORKSPACE

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+# This is a Bazel workspace for the Gazelle test data.

gazelle/python/testdata/remove_invalid_library/test.yaml

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+# Copyright 2023 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+---