fix(gazelle): Reproduce issue generating py_test rules with no test…

… files in project mode

gazelle/python/testdata/project_generation_mode/BUILD.in

@@ -0,0 +1,2 @@
+# gazelle:python_extension enabled
+# gazelle:python_generation_mode project

gazelle/python/testdata/project_generation_mode/BUILD.out

@@ -0,0 +1,15 @@
+load("@rules_python//python:defs.bzl", "py_library", "py_test")
+
+# gazelle:python_extension enabled
+# gazelle:python_generation_mode project
+
+py_library(
+    name = "project_generation_mode",
+    srcs = ["__init__.py"],
+    visibility = ["//:__subpackages__"],
+)
+
+py_test(
+    name = "project_generation_mode_test",
+    main = "__test__.py",
+)

gazelle/python/testdata/project_generation_mode/WORKSPACE

@@ -0,0 +1 @@
+# This is a Bazel workspace for the Gazelle test data.

gazelle/python/testdata/project_generation_mode/test.yaml

@@ -0,0 +1,15 @@
+# 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.
+
+---