build: schematics unit tests not being run (#22293)

Currently the schematics unit tests aren't being run and are assumed as passing. This was a result
of the following issues:

1. The `require.resolve` call in the `index.spec.ts` files was failing, but it was inside of a
`Promise` so it got silenced. It caused the test runner to completely give up on running the tests.
I was only able to see the failure using a debugger.
2. Even if the `require.resolve` call worked as expected, the `filegroup` call doesn't seem to
actually work, at least on Windows which would prevent the files from showing up in the Bazel
directory. I've switched it to `copy_to_bin`.
3. There was some issue with loading the `index.spec.ts`, presumably because the file name follows
the same pattern as unit test files. I've renamed it to `paths.ts` as a workaround.

(cherry picked from commit 263c90c)

Author: crisbeto

src/cdk/schematics/BUILD.bazel

@@ -1,10 +1,10 @@
-load("@build_bazel_rules_nodejs//:index.bzl", "pkg_npm")
+load("@build_bazel_rules_nodejs//:index.bzl", "copy_to_bin", "pkg_npm")
 load("//:packages.bzl", "VERSION_PLACEHOLDER_REPLACEMENTS")
 load("//tools:defaults.bzl", "jasmine_node_test", "ts_library")
 
 package(default_visibility = ["//visibility:public"])
 
-filegroup(
+copy_to_bin(
     name = "schematics_assets",
     srcs = glob([
         "**/files/**/*",
@@ -47,9 +47,11 @@ ts_library(
 # This package is intended to be combined into the main @angular/cdk package as a dep.
 pkg_npm(
     name = "npm_package",
-    srcs = [":schematics_assets"],
     substitutions = VERSION_PLACEHOLDER_REPLACEMENTS,
-    deps = [":schematics"],
+    deps = [
+        ":schematics",
+        ":schematics_assets",
+    ],
 )
 
 ### Testing rules

src/cdk/schematics/index.spec.ts

@@ -1,6 +1,6 @@
 import {Tree} from '@angular-devkit/schematics';
 import {SchematicTestRunner} from '@angular-devkit/schematics/testing';
-import {COLLECTION_PATH} from '../index.spec';
+import {COLLECTION_PATH} from '../paths';
 import {createTestApp, getFileContent} from '../testing';
 import {addPackageToPackageJson} from './package-config';
 

src/cdk/schematics/ng-add/index.spec.ts

@@ -1,5 +1,5 @@
 import {SchematicTestRunner} from '@angular-devkit/schematics/testing';
-import {COLLECTION_PATH} from '../../index.spec';
+import {COLLECTION_PATH} from '../../paths';
 import {createTestApp, getFileContent} from '../../testing';
 import {Schema} from './schema';
 

src/cdk/schematics/ng-generate/drag-drop/index.spec.ts

@@ -1,5 +1,5 @@
 import {defineJasmineTestCases, findBazelVersionTestCases} from '@angular/cdk/schematics/testing';
-import {MIGRATION_PATH} from '../../index.spec';
+import {MIGRATION_PATH} from '../../paths';
 import {getAllVersionNames} from '../../update-tool/target-version';
 
 describe('CDK upgrade test cases', () => {

src/cdk/schematics/ng-update/test-cases/index.spec.ts

@@ -1,5 +1,5 @@
 import {resolveBazelPath} from '@angular/cdk/schematics/testing';
-import {MIGRATION_PATH} from '../../../index.spec';
+import {MIGRATION_PATH} from '../../../paths';
 import {createTestCaseSetup} from '../../../testing';
 
 describe('ng-update external resource resolution', () => {

src/cdk/schematics/ng-update/test-cases/misc/external-resource-resolution.spec.ts

@@ -1,6 +1,6 @@
 import {resolveBazelPath} from '@angular/cdk/schematics/testing';
 import {readFileSync} from 'fs';
-import {MIGRATION_PATH} from '../../../index.spec';
+import {MIGRATION_PATH} from '../../../paths';
 import {createTestCaseSetup} from '../../../testing';
 
 describe('global stylesheets migration', () => {

src/cdk/schematics/ng-update/test-cases/misc/global-stylesheets.spec.ts

@@ -1,5 +1,5 @@
 import {resolveBazelPath} from '@angular/cdk/schematics/testing';
-import {MIGRATION_PATH} from '../../../index.spec';
+import {MIGRATION_PATH} from '../../../paths';
 import {createTestCaseSetup} from '../../../testing';
 
 describe('v6 method call checks', () => {

src/cdk/schematics/ng-update/test-cases/misc/method-call-checks.spec.ts

@@ -0,0 +1,15 @@
+/**
+ * @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
+ */
+
+import {join} from 'path';
+
+/** Path to the schematic collection for non-migration schematics. */
+export const COLLECTION_PATH = join(__dirname, 'collection.json');
+
+/** Path to the schematic collection that includes the migrations. */
+export const MIGRATION_PATH = join(__dirname, 'migration.json');

src/cdk/schematics/paths.ts

@@ -1,10 +1,10 @@
-load("@build_bazel_rules_nodejs//:index.bzl", "pkg_npm")
+load("@build_bazel_rules_nodejs//:index.bzl", "copy_to_bin", "pkg_npm")
 load("//:packages.bzl", "VERSION_PLACEHOLDER_REPLACEMENTS")
 load("//tools:defaults.bzl", "jasmine_node_test", "ts_library")
 
 package(default_visibility = ["//visibility:public"])
 
-filegroup(
+copy_to_bin(
     name = "schematics_assets",
     srcs = ["ng-update/migrations/hammer-gestures-v9/gesture-config.template"] + glob([
         "ng-generate/*/files/**/*",
@@ -44,9 +44,11 @@ ts_library(
 # This package is intended to be combined into the main @angular/material package as a dep.
 pkg_npm(
     name = "npm_package",
-    srcs = [":schematics_assets"],
     substitutions = VERSION_PLACEHOLDER_REPLACEMENTS,
-    deps = [":schematics"],
+    deps = [
+        ":schematics",
+        ":schematics_assets",
+    ],
 )
 
 ### Testing rules