feat(stepper): add test harness (#20092)

Adds test harnesses for the stepper-related components.

Author: crisbeto

src/material/config.bzl

@@ -55,6 +55,7 @@ entryPoints = [
     "sort",
     "sort/testing",
     "stepper",
+    "stepper/testing",
     "table",
     "table/testing",
     "tabs",

src/material/stepper/step-header.html

@@ -19,8 +19,9 @@
      [class.mat-step-label-selected]="selected"
      [class.mat-step-label-error]="state == 'error'">
   <!-- If there is a label template, use it. -->
-  <ng-container *ngIf="_templateLabel()" [ngTemplateOutlet]="_templateLabel()!.template">
-  </ng-container>
+  <div class="mat-step-text-label" *ngIf="_templateLabel()">
+    <ng-container [ngTemplateOutlet]="_templateLabel()!.template"></ng-container>
+  </div>
   <!-- If there is no label template, fall back to the text label. -->
   <div class="mat-step-text-label" *ngIf="_stringLabel()">{{label}}</div>
 

src/material/stepper/stepper-button.ts

@@ -13,6 +13,7 @@ import {Directive} from '@angular/core';
 @Directive({
   selector: 'button[matStepperNext]',
   host: {
+    'class': 'mat-stepper-next',
     '[type]': 'type',
   },
   inputs: ['type']
@@ -24,6 +25,7 @@ export class MatStepperNext extends CdkStepperNext {
 @Directive({
   selector: 'button[matStepperPrevious]',
   host: {
+    'class': 'mat-stepper-previous',
     '[type]': 'type',
   },
   inputs: ['type']

src/material/stepper/testing/BUILD.bazel

@@ -0,0 +1,53 @@
+load("//tools:defaults.bzl", "ng_test_library", "ng_web_test_suite", "ts_library")
+
+package(default_visibility = ["//visibility:public"])
+
+ts_library(
+    name = "testing",
+    srcs = glob(
+        ["**/*.ts"],
+        exclude = ["**/*.spec.ts"],
+    ),
+    module_name = "@angular/material/stepper/testing",
+    deps = [
+        "//src/cdk/testing",
+    ],
+)
+
+filegroup(
+    name = "source-files",
+    srcs = glob(["**/*.ts"]),
+)
+
+ng_test_library(
+    name = "harness_tests_lib",
+    srcs = ["shared.spec.ts"],
+    deps = [
+        ":testing",
+        "//src/cdk/stepper",
+        "//src/cdk/testing",
+        "//src/cdk/testing/private",
+        "//src/cdk/testing/testbed",
+        "//src/material/stepper",
+        "@npm//@angular/forms",
+        "@npm//@angular/platform-browser",
+    ],
+)
+
+ng_test_library(
+    name = "unit_tests_lib",
+    srcs = glob(
+        ["**/*.spec.ts"],
+        exclude = ["shared.spec.ts"],
+    ),
+    deps = [
+        ":harness_tests_lib",
+        ":testing",
+        "//src/material/stepper",
+    ],
+)
+
+ng_web_test_suite(
+    name = "unit_tests",
+    deps = [":unit_tests_lib"],
+)

src/material/stepper/testing/index.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 * from './public-api';

src/material/stepper/testing/public-api.ts

@@ -0,0 +1,12 @@
+/**
+ * @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 * from './stepper-harness';
+export * from './step-harness';
+export * from './step-harness-filters';
+export * from './stepper-button-harnesses';