test: add test for new types_bundle rule from Angular bazel package (#45405)

Adds a little golden test for the new `types_bundle` rule that ensures
the rule works at a general level. This rule will be useful for non-APF
ESM packages like the Angular compiler-cli (for which we also want to
bundle types to make them compatible with TypeScripts ESM type
resolution)

PR Close #45405

packages/bazel/test/types_bundle/BUILD.bazel

@@ -0,0 +1,29 @@
+load("@build_bazel_rules_nodejs//:index.bzl", "generated_file_test")
+load("//packages/bazel/src/types_bundle:index.bzl", "types_bundle")
+load("//tools:defaults.bzl", "ts_library")
+
+package(default_testonly = True)
+
+ts_library(
+    name = "test_transitive_lib",
+    srcs = ["transitive_fixture.ts"],
+)
+
+ts_library(
+    name = "test_lib",
+    srcs = ["bundle_entry.ts"],
+    deps = [":test_transitive_lib"],
+)
+
+types_bundle(
+    name = "bundled_types",
+    entry_point = "bundle_entry.d.ts",
+    output_name = "output_index.d.ts",
+    deps = [":test_lib"],
+)
+
+generated_file_test(
+    name = "test",
+    src = "expected_types_bundle.d.ts",
+    generated = ":bundled_types",
+)

packages/bazel/test/types_bundle/bundle_entry.ts

@@ -0,0 +1,11 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export {transitiveExport} from './transitive_fixture';
+
+export const hello = 1;

packages/bazel/test/types_bundle/expected_types_bundle.d.ts

@@ -0,0 +1,6 @@
+export declare const hello = 1;
+
+
+export declare const transitiveExport = "transitive";
+
+export { }

packages/bazel/test/types_bundle/transitive_fixture.ts

@@ -0,0 +1,9 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export const transitiveExport = 'transitive';