Remove removed tests from TEST_DEPS, and add assertions to prevent …

…recurrence.

PiperOrigin-RevId: 386240052

core/src/main/java/com/google/errorprone/bugpatterns/build_defs.bzl

@@ -0,0 +1,25 @@
+#  Copyright 2021 The Error Prone Authors.
+#
+#  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.
+#
+
+"""Asserts that `keys` contains no entries not in `files`."""
+
+def assert_no_unexpected_files(keys, files):
+    unexpected_tests = difference(keys, files)
+    if unexpected_tests:
+        fail("Unexpected tests: " + ", ".join(unexpected_tests))
+
+# Returns the difference of two sets.
+def difference(set1, set2):
+    return [i for i in set1 if i not in set2]