build: add blocklist for material unit tests

Initially the blocklist has been removed because there were
no remaining disabled tests that failed. Also the blocklist
logic didn't work anymore because the `material-unit-tests` CI
job now runs against `angular/components#master` with Bazel.

388578f tried to revert the removal
of the blocklist in favor of a new upcoming breaking change with
HammerJS, but the revert doesn't help since the blocklist still
doesn't work with Bazel.

In order to make the blocklist work with the unit tests running
with Bazel, a PR has been submitted on the components repository.
See: angular/components#16833.

This commit updates the blocklist logic on the framework side to
work with the new logic on the components repo side.

Author: devversion

scripts/ci/run_angular_material_unit_tests.sh

@@ -21,9 +21,9 @@ cd ${MATERIAL_REPO_TMP_DIR}
 # Note that it's not necessary to perform a yarn install, as Bazel performs its own yarn install.
 node ${angular_dir}/scripts/ci/update-deps-to-dist-packages.js ${MATERIAL_REPO_TMP_DIR}/package.json ${angular_dir}/dist/packages-dist-ivy-aot/
 
-# Append the test blocklist into angular/material2's karma-test-shim.js.
-# This filters out known-failing tests because the goal is to prevent regressions.
-cat ${angular_dir}/tools/material-ci/angular_material_test_blocklist.js >> ./test/karma-test-shim.js
+# Copy the test blocklist into the "angular/components" repository. The components
+# repository automatically picks up the blocklist and disables the specified tests.
+cp ${angular_dir}/tools/material-ci/test-blocklist.ts ${MATERIAL_REPO_TMP_DIR}/test/
 
 # Create a symlink for the Bazel binary installed through NPM, as running through Yarn introduces OOM errors.
 ./scripts/circleci/setup_bazel_binary.sh

tools/material-ci/angular_material_test_blocklist.js

@@ -1,24 +1,32 @@
 ### Unit tests for Angular CDK/Material
-The unit tests from angular/material2 run on CircleCI under the `material-unit-tests` job.
-Known failing tests are skipped based on the blocklist in
-`tools/material-ci/angular_material_test_blocklist.js`. Whenever the root cause of a known failure
-is identified, the `notes` field for the corresponding tests should be updated. Whenever a failure
-is resolved, the corresponding tests should be removed from the blocklist.
+
+Currently, all changes to Ivy are validated against the test suite of the
+`angular/components` repository. Known failing tests are skipped based on
+the blocklist in `tools/material-ci/test-blocklist.ts`.
+
+Whenever the root cause of a known failure is identified, the `notes` field
+for the corresponding tests should be updated. Whenever a failure is resolved,
+the corresponding tests should be removed from the blocklist.
 
 ### Debugging
-To debug a failure, you need to work against the angular/material2 repo:
-1. Clone `angular/material2`
-2. Checkout the `ivy-2019` branch
-3. Run `yarn`
-4. Run `scripts/ivy/install-angular.sh path/to/local/angular/repo`
-5. Run `gulp test`
-
-### Regenerating the blocklist
-If a problem has been fixed, you can regenerate the blocklist by:
-1. Clone `angular/material2`
-2. Checkout the `ivy-2019` branch
-3. Run `yarn`
-4. Run `scripts/ivy/install-angular.sh path/to/local/angular/repo`
-5. Run `gulp test`. Let it finish. It will take a few minutes.
-6. Run `scripts/ivy/generate-blocklist.js path/to/local/angular/repo`
-7. Copy the new blocklist from `dist/angular_material_test_blocklist.js`
+
+Information on debugging can be found [here](../../docs/DEBUG_MATERIAL_IVY.md).
+
+### Excluding new tests
+
+In case there are any tests in the components test suite that fail due to
+recent changes in the framework and you want to exclude the tests temporarily,
+a new entry can be added to the `test-blocklist.ts` file.
+
+Each property in the blocklist object corresponds to a test in the components
+repository. The name of the property **must** match the exact test name. Additionally
+it's **recommended** that every entry has a field with a note on why the test is disabled.
+
+```ts
+export const testBlocklist: any = {
+  'MatSlider should be able to drag thumb': {
+    error: 'Cannot register event "dragstart".',
+    notes: 'Breaking change where HammerJS module needs to be imported.'
+  }
+}
+```

tools/material-ci/instructions.md

@@ -0,0 +1,29 @@
+/**
+ * @license
+ * Copyright Google Inc. 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
+ */
+
+// clang-format off
+// tslint:disable
+
+interface BlocklistEntry {
+  /** Description on why the given test is disabled. */
+  notes: string;
+  /** Optional error that has been thrown in the test. */
+  error?: string;
+}
+
+/**
+ * List of tests that should not run in the Angular component test suites. This should
+ * be empty in the components repository, but the file will be overwritten if the framework
+ * repository runs the Angular component test suites against the latest snapshots. This is
+ * helpful because sometimes breaking changes that break individual tests land in the framework
+ * repository. It should be possible to disable these tests until the component repository
+ * migrated the broken tests.
+ */
+export const testBlocklist: {[testName: string]: BlocklistEntry} = {};
+
+// clang-format on