feat(material/schematics): initial setup for v15 ng-update (#25102)

src/material/schematics/ng-update/index.ts

@@ -21,6 +21,7 @@ import {MiscTemplateMigration} from './migrations/misc-checks/misc-template';
 import {RippleSpeedFactorMigration} from './migrations/misc-ripples-v7/ripple-speed-factor-migration';
 import {SecondaryEntryPointsMigration} from './migrations/package-imports-v8/secondary-entry-points-migration';
 import {ThemingApiMigration} from './migrations/theming-api-v12/theming-api-migration';
+import {LegacyComponentsMigration} from './migrations/legacy-components-v15';
 
 import {materialUpgradeData} from './upgrade-data';
 
@@ -34,6 +35,7 @@ const materialMigrations: NullableDevkitMigration[] = [
   SecondaryEntryPointsMigration,
   HammerGesturesMigration,
   ThemingApiMigration,
+  LegacyComponentsMigration,
 ];
 
 /** Entry point for the migration schematics with target of Angular Material v6 */

src/material/schematics/ng-update/migrations/legacy-components-v15/index.ts

@@ -0,0 +1,13 @@
+/**
+ * @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 {Migration, TargetVersion} from '@angular/cdk/schematics';
+
+export class LegacyComponentsMigration extends Migration<null> {
+  enabled = this.targetVersion === TargetVersion.V15;
+}

src/material/schematics/ng-update/test-cases/v15/legacy-components-v15.spec.ts

@@ -0,0 +1,45 @@
+import {UnitTestTree} from '@angular-devkit/schematics/testing';
+import {createTestCaseSetup} from '@angular/cdk/schematics/testing';
+import {join} from 'path';
+import {MIGRATION_PATH} from '../../../paths';
+
+const PROJECT_ROOT_DIR = '/projects/cdk-testing';
+const THEME_FILE_PATH = join(PROJECT_ROOT_DIR, 'src/theme.scss');
+const TS_FILE_PATH = join(PROJECT_ROOT_DIR, 'src/app/app.component.ts');
+
+describe('v15 legacy components migration', () => {
+  let tree: UnitTestTree;
+
+  /** Writes an array of lines as a single file. */
+  let writeLines: (path: string, lines: string[]) => void;
+
+  /** Reads a file and split it into an array where each item is a new line. */
+  let splitFile: (path: string) => string[];
+
+  /** Runs the v15 migration on the test application. */
+  let runMigration: () => Promise<{logOutput: string}>;
+
+  beforeEach(async () => {
+    const testSetup = await createTestCaseSetup('migration-v15', MIGRATION_PATH, []);
+    tree = testSetup.appTree;
+    runMigration = testSetup.runFixers;
+    splitFile = (path: string) => tree.readContent(path).split('\n');
+    writeLines = (path: string, lines: string[]) => testSetup.writeFile(path, lines.join('\n'));
+  });
+
+  describe('typescript migrations', () => {
+    it('should do nothing yet', async () => {
+      writeLines(TS_FILE_PATH, [' ']);
+      await runMigration();
+      expect(splitFile(TS_FILE_PATH)).toEqual([' ']);
+    });
+  });
+
+  describe('style migrations', () => {
+    it('should do nothing yet', async () => {
+      writeLines(THEME_FILE_PATH, [' ']);
+      await runMigration();
+      expect(splitFile(THEME_FILE_PATH)).toEqual([' ']);
+    });
+  });
+});