fix gulp tests

Author: mmalerba

src/material-experimental/mdc-checkbox/testing/checkbox-harness.spec.ts

@@ -1,5 +1,5 @@
-import {MatCheckboxModule} from '@angular/material-experimental/mdc-checkbox';
-import {MatCheckboxHarness} from '@angular/material-experimental/mdc-checkbox/testing';
+import {MatCheckboxModule} from '../index';
+import {MatCheckboxHarness} from './checkbox-harness';
 import {runTests} from '@angular/material/checkbox/testing/shared.spec';
 
 describe('MDC-based MatCheckboxHarness', () => {

src/material/checkbox/testing/checkbox-harness.spec.ts

@@ -1,5 +1,5 @@
 import {MatCheckboxModule} from '@angular/material/checkbox';
-import {MatCheckboxHarness} from '@angular/material/checkbox/testing/checkbox-harness';
+import {MatCheckboxHarness} from './checkbox-harness';
 import {runTests} from '@angular/material/checkbox/testing/shared.spec';
 
 describe('Non-MDC-based MatCheckboxHarness', () => {

src/material/tsconfig-tests.json

@@ -27,7 +27,7 @@
   },
   "include": [
     "**/*.spec.ts",
-    "index.ts"
+    "./**/index.ts"
   ],
   "exclude": [
     "**/schematics/**/*.ts",

test/karma-system-config.js

@@ -102,6 +102,8 @@ System.config({
     '@angular/material/button-toggle': 'dist/packages/material/button-toggle/index.js',
     '@angular/material/card': 'dist/packages/material/card/index.js',
     '@angular/material/checkbox': 'dist/packages/material/checkbox/index.js',
+    '@angular/material/checkbox/testing': 'dist/packages/material/checkbox/testing/index.js',
+    '@angular/material/checkbox/testing/shared.spec': 'dist/packages/material/checkbox/testing/shared.spec.js',
     '@angular/material/chips': 'dist/packages/material/chips/index.js',
     '@angular/material/core': 'dist/packages/material/core/index.js',
     '@angular/material/datepicker': 'dist/packages/material/datepicker/index.js',
@@ -138,6 +140,8 @@ System.config({
         'dist/packages/material-experimental/mdc-card/index.js',
     '@angular/material-experimental/mdc-checkbox':
         'dist/packages/material-experimental/mdc-checkbox/index.js',
+    '@angular/material-experimental/mdc-checkbox/testing':
+        'dist/packages/material-experimental/mdc-checkbox/testing/index.js',
     '@angular/material-experimental/mdc-chips':
         'dist/packages/material-experimental/mdc-chips/index.js',
     '@angular/material-experimental/mdc-helpers':