Migrate the `javaTestInvalidTestClassAtRootPackage` test to Starlark

The test is removed from Bazel and added to rules_java

(ignore-relnotes)

PiperOrigin-RevId: 911323913
Change-Id: Ie7cd3da252158916945911ef1cf59099a098e4e0

BUILD

diff --git a/BUILD b/BUILD
index 9f0e223..2fbbbd6 100644
--- a/BUILD
+++ b/BUILD
@@ -1,4 +1,5 @@
 load("@rules_license//rules:license.bzl", "license")
+load("//java:java_test.bzl", "java_test")
 
 package(default_applicable_licenses = [":license"])
 
@@ -27,3 +28,17 @@
     name = "license",
     package_name = "rules_java",
 )
+
+# For exercising root-package behavior in tests
+java_test(
+    name = "invalid_test_at_repo_root",
+    srcs = ["SomeTest.java"],
+    tags = [
+        "manual",
+        "nobuilder",
+        "notap",
+    ],
+    visibility = [
+        "//test/java/bazel/rules:__pkg__",
+    ],
+)

test/java/bazel/rules/java_test_tests.bzl

diff --git a/test/java/bazel/rules/java_test_tests.bzl b/test/java/bazel/rules/java_test_tests.bzl
index 9ee618d..5c76b0e 100644
--- a/test/java/bazel/rules/java_test_tests.bzl
+++ b/test/java/bazel/rules/java_test_tests.bzl
@@ -35,10 +35,25 @@
         matching.str_matches("-Dbazel.test_suite=bazel.rules.test_deduced_test_class.foo"),
     )
 
+# regression test for https://github.com/bazelbuild/bazel/issues/20378
+def _test_invalid_test_class_at_repo_root(name):
+    analysis_test(
+        name = name,
+        impl = _test_invalid_test_class_at_repo_root_impl,
+        target = "//:invalid_test_at_repo_root",
+        expect_failure = True,
+    )
+
+def _test_invalid_test_class_at_repo_root_impl(env, target):
+    env.expect.that_target(target).failures().contains_predicate(
+        matching.str_matches("cannot determine test class."),
+    )
+
 def java_test_tests(name):
     test_suite(
         name = name,
         tests = [
             _test_deduced_test_class,
+            _test_invalid_test_class_at_repo_root,
         ],
     )