Copy unittest.bzl from bazel_skylib to rules_testing.

PiperOrigin-RevId: 627817663

lib/BUILD

@@ -56,13 +56,26 @@ bzl_library(
     srcs = ["util.bzl"],
     visibility = ["//visibility:public"],
     deps = [
+        ":unittest",
         "@bazel_skylib//lib:paths",
         "@bazel_skylib//lib:types",
-        "@bazel_skylib//lib:unittest",
         "@bazel_skylib//rules:write_file",
     ],
 )
 
+# This version is forked from bazel_skylib
+bzl_library(
+    name = "unittest",
+    srcs = ["unittest.bzl"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "@bazel_skylib//lib:new_sets",
+        "@bazel_skylib//lib:partial",
+        "@bazel_skylib//lib:sets",
+        "@bazel_skylib//lib:types",
+    ],
+)
+
 bzl_library(
     name = "unit_test_bzl",
     srcs = ["unit_test.bzl"],

lib/private/BUILD

@@ -122,7 +122,7 @@ bzl_library(
 bzl_library(
     name = "expect_meta_bzl",
     srcs = ["expect_meta.bzl"],
-    deps = ["@bazel_skylib//lib:unittest"],
+    deps = ["//lib:unittest"],
 )
 
 bzl_library(

lib/private/expect_meta.bzl

@@ -16,7 +16,7 @@
 ExpectMeta object implementation.
 """
 
-load("@bazel_skylib//lib:unittest.bzl", ut_asserts = "asserts")
+load("//lib:unittest.bzl", ut_asserts = "asserts")
 
 def _expect_meta_new(env, exprs = [], details = [], format_str_kwargs = None):
     """Creates a new "ExpectMeta" struct".