diff --git a/tests/legacy-cli/e2e/tests/build/build-app-shell-with-schematic.ts b/tests/legacy-cli/e2e/tests/build/build-app-shell-with-schematic.ts
index cdbef3d36c..4d6b61a7b6 100644
--- a/tests/legacy-cli/e2e/tests/build/build-app-shell-with-schematic.ts
+++ b/tests/legacy-cli/e2e/tests/build/build-app-shell-with-schematic.ts
@@ -1,6 +1,7 @@
 import { getGlobalVariable } from '../../utils/env';
 import { appendToFile, expectFileToMatch } from '../../utils/fs';
-import { ng, silentNpm } from '../../utils/process';
+import { installPackage } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { updateJsonFile } from '../../utils/project';
 
 const snapshots = require('../../ng-snapshot/package.json');
@@ -23,7 +24,7 @@ export default async function () {
     });
 
     for (const pkg of packagesToInstall) {
-      await silentNpm('install', pkg);
+      await installPackage(pkg);
     }
   }
 
diff --git a/tests/legacy-cli/e2e/tests/build/build-app-shell.ts b/tests/legacy-cli/e2e/tests/build/build-app-shell.ts
index e74e4f1de8..60e430619c 100644
--- a/tests/legacy-cli/e2e/tests/build/build-app-shell.ts
+++ b/tests/legacy-cli/e2e/tests/build/build-app-shell.ts
@@ -1,7 +1,8 @@
 import { stripIndent } from 'common-tags';
 import { getGlobalVariable } from '../../utils/env';
 import { expectFileToMatch, writeFile } from '../../utils/fs';
-import { ng, npm } from '../../utils/process';
+import { installWorkspacePackages } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { updateJsonFile } from '../../utils/project';
 import { readNgVersion } from '../../utils/version';
 
@@ -159,7 +160,7 @@ export default function() {
       updateJsonFile('package.json', packageJson => {
         const dependencies = packageJson['dependencies'];
         dependencies['@angular/platform-server'] = platformServerVersion;
-      }).then(() => npm('install')),
+      }).then(() => installWorkspacePackages()),
     )
     .then(() => ng('run', 'test-project:app-shell'))
     .then(() => expectFileToMatch('dist/test-project/index.html', /shell Works!/));
diff --git a/tests/legacy-cli/e2e/tests/build/material.ts b/tests/legacy-cli/e2e/tests/build/material.ts
index 3719bc4eab..4ee43b0f5a 100644
--- a/tests/legacy-cli/e2e/tests/build/material.ts
+++ b/tests/legacy-cli/e2e/tests/build/material.ts
@@ -1,6 +1,7 @@
 import { getGlobalVariable } from '../../utils/env';
 import { replaceInFile } from '../../utils/fs';
-import { ng, silentNpm } from '../../utils/process';
+import { installPackage, installWorkspacePackages } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { isPrereleaseCli, updateJsonFile } from '../../utils/project';
 
 const snapshots = require('../../ng-snapshot/package.json');
@@ -25,12 +26,12 @@ export default async function () {
         snapshots.dependencies['@angular/material-moment-adapter'];
     });
 
-    await silentNpm('install');
+    await installWorkspacePackages();
   } else {
-    await silentNpm('install', '@angular/material-moment-adapter');
+    await installPackage('@angular/material-moment-adapter');
   }
 
-  await silentNpm('install', 'moment');
+  await installPackage('moment');
 
   await ng('build', '--prod');
 
diff --git a/tests/legacy-cli/e2e/tests/build/platform-server.ts b/tests/legacy-cli/e2e/tests/build/platform-server.ts
index c026a15c05..1d0e992820 100644
--- a/tests/legacy-cli/e2e/tests/build/platform-server.ts
+++ b/tests/legacy-cli/e2e/tests/build/platform-server.ts
@@ -1,6 +1,7 @@
 import { normalize } from 'path';
 import { getGlobalVariable } from '../../utils/env';
 import { appendToFile, expectFileToMatch, writeFile } from '../../utils/fs';
+import { installPackage } from '../../utils/packages';
 import { exec, ng, silentNpm } from '../../utils/process';
 import { isPrereleaseCli, updateJsonFile } from '../../utils/project';
 
@@ -37,7 +38,7 @@ export default async function () {
     });
 
     for (const pkg of packagesToInstall) {
-      await silentNpm('install', pkg);
+      await installPackage(pkg);
     }
   }
 
diff --git a/tests/legacy-cli/e2e/tests/build/service-worker.ts b/tests/legacy-cli/e2e/tests/build/service-worker.ts
index 670f40e1e4..df7c3e358c 100644
--- a/tests/legacy-cli/e2e/tests/build/service-worker.ts
+++ b/tests/legacy-cli/e2e/tests/build/service-worker.ts
@@ -1,7 +1,8 @@
 import {join} from 'path';
 import {getGlobalVariable} from '../../utils/env';
 import {expectFileNotToExist, expectFileToExist, expectFileToMatch, writeFile} from '../../utils/fs';
-import {ng, npm, silentNpm} from '../../utils/process';
+import { installPackage, uninstallPackage } from '../../utils/packages';
+import {ng} from '../../utils/process';
 
 const MANIFEST = {
   index: '/index.html',
@@ -25,8 +26,8 @@ const MANIFEST = {
 export default function() {
   // Can't use the `ng` helper because somewhere the environment gets
   // stuck to the first build done
-  return silentNpm('remove', '@angular/service-worker')
-    .then(() => silentNpm('install', '@angular/service-worker'))
+  return uninstallPackage('@angular/service-worker')
+    .then(() => installPackage('@angular/service-worker'))
     .then(() => ng('config', 'projects.test-project.architect.build.options.serviceWorker', 'true'))
     .then(() => writeFile('src/ngsw-config.json', JSON.stringify(MANIFEST, null, 2)))
     .then(() => ng('build', '--optimization'))
diff --git a/tests/legacy-cli/e2e/tests/build/styles/material-import.ts b/tests/legacy-cli/e2e/tests/build/styles/material-import.ts
index 3c2b6f6caf..bbdf53c52a 100644
--- a/tests/legacy-cli/e2e/tests/build/styles/material-import.ts
+++ b/tests/legacy-cli/e2e/tests/build/styles/material-import.ts
@@ -4,7 +4,8 @@ import {
   replaceInFile,
   writeMultipleFiles,
 } from '../../../utils/fs';
-import { ng, silentNpm } from '../../../utils/process';
+import { installWorkspacePackages } from '../../../utils/packages';
+import { ng } from '../../../utils/process';
 import { updateJsonFile } from '../../../utils/project';
 
 const snapshots = require('../../../ng-snapshot/package.json');
@@ -19,7 +20,7 @@ export default async function () {
     dependencies['@angular/cdk'] = isSnapshotBuild ? snapshots.dependencies['@angular/cdk'] : 'latest';
   });
 
-  await silentNpm('install');
+  await installWorkspacePackages();
 
   for (const ext of ['css', 'scss', 'less', 'styl']) {
     await writeMultipleFiles({
diff --git a/tests/legacy-cli/e2e/tests/build/styles/node-sass.ts b/tests/legacy-cli/e2e/tests/build/styles/node-sass.ts
index 4c9d116a51..cedd837836 100644
--- a/tests/legacy-cli/e2e/tests/build/styles/node-sass.ts
+++ b/tests/legacy-cli/e2e/tests/build/styles/node-sass.ts
@@ -4,7 +4,8 @@ import {
   replaceInFile,
   writeMultipleFiles,
 } from '../../../utils/fs';
-import { ng, silentExec, silentNpm } from '../../../utils/process';
+import { installPackage } from '../../../utils/packages';
+import { ng, silentExec } from '../../../utils/process';
 import { updateJsonFile } from '../../../utils/project';
 import { expectToFail } from '../../../utils/utils';
 
@@ -32,7 +33,7 @@ export default async function () {
   await silentExec('rm', '-rf', 'node_modules/sass');
   await expectToFail(() => ng('build', '--extract-css', '--source-map'));
 
-  await silentNpm('install', 'node-sass');
+  await installPackage('node-sass');
   await silentExec('rm', '-rf', 'node_modules/sass');
   await ng('build', '--extract-css', '--source-map');
 
@@ -41,9 +42,9 @@ export default async function () {
   await expectToFail(() => expectFileToMatch('dist/test-project/styles.css', '"mappings":""'));
   await expectFileToMatch('dist/test-project/main.js', /.outer.*.inner.*background:\s*#[fF]+/);
 
-  await silentNpm('install', 'node-gyp');
-  await silentNpm('install', 'fibers');
-  await silentNpm('install', 'sass');
+  await installPackage('node-gyp');
+  await installPackage('fibers');
+  await installPackage('sass');
   await silentExec('rm', '-rf', 'node_modules/node-sass');
   await ng('build', '--extract-css', '--source-map');
 
diff --git a/tests/legacy-cli/e2e/tests/commands/add/add-pwa-yarn.ts b/tests/legacy-cli/e2e/tests/commands/add/add-pwa-yarn.ts
index 37f9299542..4730f1f1ef 100644
--- a/tests/legacy-cli/e2e/tests/commands/add/add-pwa-yarn.ts
+++ b/tests/legacy-cli/e2e/tests/commands/add/add-pwa-yarn.ts
@@ -1,8 +1,13 @@
 import { join } from 'path';
+import { getGlobalVariable } from '../../../utils/env';
 import { expectFileToExist, readFile, rimraf } from '../../../utils/fs';
 import { ng, npm } from '../../../utils/process';
 
 export default async function () {
+    if (getGlobalVariable('package-manager') === 'yarn') {
+      return;
+    }
+
     // forcibly remove in case another test doesn't clean itself up
     await rimraf('node_modules/@angular/pwa');
 
diff --git a/tests/legacy-cli/e2e/tests/i18n/extract-ivy-libraries.ts b/tests/legacy-cli/e2e/tests/i18n/extract-ivy-libraries.ts
index f61b7f7cb3..71418bfbe2 100644
--- a/tests/legacy-cli/e2e/tests/i18n/extract-ivy-libraries.ts
+++ b/tests/legacy-cli/e2e/tests/i18n/extract-ivy-libraries.ts
@@ -1,6 +1,7 @@
 import { getGlobalVariable } from '../../utils/env';
 import { expectFileToMatch, replaceInFile, writeFile } from '../../utils/fs';
-import { ng, npm } from '../../utils/process';
+import { installPackage, uninstallPackage } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { readNgVersion } from '../../utils/version';
 
 export default async function() {
@@ -57,7 +58,7 @@ export default async function() {
   if (getGlobalVariable('argv')['ng-snapshots']) {
     localizeVersion = require('../../ng-snapshot/package.json').dependencies['@angular/localize'];
   }
-  await npm('install', `${localizeVersion}`);
+  await installPackage(localizeVersion);
 
   // Extract messages
   await ng('xi18n', '--ivy');
@@ -69,5 +70,5 @@ export default async function() {
     'projects/i18n-lib-test/src/lib/i18n-lib-test.component.ts',
   );
 
-  await npm('uninstall', '@angular/localize');
+  await uninstallPackage('@angular/localize');
 }
diff --git a/tests/legacy-cli/e2e/tests/i18n/extract-ivy.ts b/tests/legacy-cli/e2e/tests/i18n/extract-ivy.ts
index b31d61baa3..e9e61ef7db 100644
--- a/tests/legacy-cli/e2e/tests/i18n/extract-ivy.ts
+++ b/tests/legacy-cli/e2e/tests/i18n/extract-ivy.ts
@@ -1,7 +1,8 @@
 import { join } from 'path';
 import { getGlobalVariable } from '../../utils/env';
 import { writeFile } from '../../utils/fs';
-import { ng, npm } from '../../utils/process';
+import { installPackage, uninstallPackage } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { updateJsonFile } from '../../utils/project';
 import { expectToFail } from '../../utils/utils';
 import { readNgVersion } from '../../utils/version';
@@ -30,7 +31,7 @@ export default async function() {
   if (getGlobalVariable('argv')['ng-snapshots']) {
     localizeVersion = require('../../ng-snapshot/package.json').dependencies['@angular/localize'];
   }
-  await npm('install', `${localizeVersion}`);
+  await installPackage(localizeVersion);
 
   // Should show ivy enabled application warning without --ivy flag
   const { stderr: message3 } = await ng('xi18n', '--no-ivy');
@@ -57,5 +58,5 @@ export default async function() {
     throw new Error('Expected ivy disabled application warning');
   }
 
-  await npm('uninstall', '@angular/localize');
+  await uninstallPackage('@angular/localize');
 }
diff --git a/tests/legacy-cli/e2e/tests/i18n/ivy-localize-app-shell.ts b/tests/legacy-cli/e2e/tests/i18n/ivy-localize-app-shell.ts
index f6be20dfca..ddb6fbce80 100644
--- a/tests/legacy-cli/e2e/tests/i18n/ivy-localize-app-shell.ts
+++ b/tests/legacy-cli/e2e/tests/i18n/ivy-localize-app-shell.ts
@@ -7,7 +7,8 @@ import {
   replaceInFile,
   writeFile,
 } from '../../utils/fs';
-import { ng, silentNpm } from '../../utils/process';
+import { installWorkspacePackages } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { updateJsonFile } from '../../utils/project';
 import { readNgVersion } from '../../utils/version';
 
@@ -38,7 +39,7 @@ export default async function () {
     });
   }
 
-  await silentNpm('install');
+  await installWorkspacePackages();
 
   const browserBaseDir = 'dist/test-project/browser';
 
diff --git a/tests/legacy-cli/e2e/tests/i18n/ivy-localize-server.ts b/tests/legacy-cli/e2e/tests/i18n/ivy-localize-server.ts
index 7350c23a96..412a6fa52b 100644
--- a/tests/legacy-cli/e2e/tests/i18n/ivy-localize-server.ts
+++ b/tests/legacy-cli/e2e/tests/i18n/ivy-localize-server.ts
@@ -2,7 +2,8 @@ import * as express from 'express';
 import { join } from 'path';
 import { getGlobalVariable } from '../../utils/env';
 import { appendToFile, expectFileToMatch, writeFile } from '../../utils/fs';
-import { ng, silentNpm } from '../../utils/process';
+import { installWorkspacePackages } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { updateJsonFile } from '../../utils/project';
 import { expectToFail } from '../../utils/utils';
 import { langTranslations, setupI18nConfig } from './legacy';
@@ -27,7 +28,7 @@ export default async function () {
     });
   }
 
-  await silentNpm('install');
+  await installWorkspacePackages();
 
   const serverbaseDir = 'dist/test-project/server';
   const serverBuildArgs = ['run', 'test-project:server'];
diff --git a/tests/legacy-cli/e2e/tests/i18n/ivy-localize-serviceworker.ts b/tests/legacy-cli/e2e/tests/i18n/ivy-localize-serviceworker.ts
index 242b878054..1b7b26a92f 100644
--- a/tests/legacy-cli/e2e/tests/i18n/ivy-localize-serviceworker.ts
+++ b/tests/legacy-cli/e2e/tests/i18n/ivy-localize-serviceworker.ts
@@ -8,7 +8,8 @@ import {
   replaceInFile,
   writeFile,
 } from '../../utils/fs';
-import { ng, npm } from '../../utils/process';
+import { installPackage } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { updateJsonFile } from '../../utils/project';
 import { expectToFail } from '../../utils/utils';
 import { readNgVersion } from '../../utils/version';
@@ -22,7 +23,7 @@ export default async function() {
   if (getGlobalVariable('argv')['ng-snapshots']) {
     localizeVersion = require('../../ng-snapshot/package.json').dependencies['@angular/localize'];
   }
-  await npm('install', `${localizeVersion}`);
+  await installPackage(localizeVersion);
 
   let serviceWorkerVersion = '@angular/service-worker@' + readNgVersion();
   if (getGlobalVariable('argv')['ng-snapshots']) {
@@ -30,7 +31,7 @@ export default async function() {
       '@angular/service-worker'
     ];
   }
-  await npm('install', `${serviceWorkerVersion}`);
+  await installPackage(serviceWorkerVersion);
 
   await updateJsonFile('tsconfig.json', config => {
     config.compilerOptions.target = 'es2015';
diff --git a/tests/legacy-cli/e2e/tests/i18n/legacy.ts b/tests/legacy-cli/e2e/tests/i18n/legacy.ts
index 238945af8c..a53df4aa75 100644
--- a/tests/legacy-cli/e2e/tests/i18n/legacy.ts
+++ b/tests/legacy-cli/e2e/tests/i18n/legacy.ts
@@ -2,7 +2,8 @@ import * as express from 'express';
 import { resolve } from 'path';
 import { getGlobalVariable } from '../../utils/env';
 import { appendToFile, copyFile, expectFileToExist, expectFileToMatch, replaceInFile, writeFile } from '../../utils/fs';
-import { ng, npm } from '../../utils/process';
+import { installPackage } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { updateJsonFile } from '../../utils/project';
 import { expectToFail } from '../../utils/utils';
 import { readNgVersion } from '../../utils/version';
@@ -213,7 +214,7 @@ export async function setupI18nConfig(useLocalize = true, format: keyof typeof f
     if (getGlobalVariable('argv')['ng-snapshots']) {
       localizeVersion = require('../../ng-snapshot/package.json').dependencies['@angular/localize'];
     }
-    await npm('install', `${localizeVersion}`);
+    await installPackage(localizeVersion);
   }
 
   // Extract the translation messages.
diff --git a/tests/legacy-cli/e2e/tests/i18n/ve-localize-es2015.ts b/tests/legacy-cli/e2e/tests/i18n/ve-localize-es2015.ts
index 19d5a45778..0a0094db90 100644
--- a/tests/legacy-cli/e2e/tests/i18n/ve-localize-es2015.ts
+++ b/tests/legacy-cli/e2e/tests/i18n/ve-localize-es2015.ts
@@ -1,10 +1,11 @@
 import { getGlobalVariable } from '../../utils/env';
 import { expectFileToMatch, writeFile } from '../../utils/fs';
-import { execAndWaitForOutputToMatch, ng, npm } from '../../utils/process';
+import { installPackage } from '../../utils/packages';
+import { execAndWaitForOutputToMatch, ng } from '../../utils/process';
 import { updateJsonFile } from '../../utils/project';
 import { expectToFail } from '../../utils/utils';
 import { readNgVersion } from '../../utils/version';
-import { baseDir, externalServer, langTranslations, setupI18nConfig } from './legacy';
+import { externalServer, langTranslations, setupI18nConfig } from './legacy';
 
 export default async function() {
   if (!getGlobalVariable('argv')['ve']) {
@@ -19,7 +20,7 @@ export default async function() {
   if (getGlobalVariable('argv')['ng-snapshots']) {
     localizeVersion = require('../../ng-snapshot/package.json').dependencies['@angular/localize'];
   }
-  await npm('install', `${localizeVersion}`);
+  await installPackage(localizeVersion);
 
   // Ensure a ES2015 build is used.
   await writeFile('.browserslistrc', 'Chrome 65');
diff --git a/tests/legacy-cli/e2e/tests/misc/common-async.ts b/tests/legacy-cli/e2e/tests/misc/common-async.ts
index 9c317e7596..90cf4a0227 100644
--- a/tests/legacy-cli/e2e/tests/misc/common-async.ts
+++ b/tests/legacy-cli/e2e/tests/misc/common-async.ts
@@ -1,7 +1,7 @@
 import {readdirSync} from 'fs';
 import {oneLine} from 'common-tags';
-
-import {ng, silentNpm} from '../../utils/process';
+import { installPackage } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import {appendToFile, expectFileToExist, prependToFile, replaceInFile} from '../../utils/fs';
 import {expectToFail} from '../../utils/utils';
 
@@ -32,7 +32,7 @@ export default function() {
       }
       oldNumberOfFiles = currentNumberOfDistFiles;
     })
-    .then(() => silentNpm('install', 'moment'))
+    .then(() => installPackage('moment'))
     .then(() => appendToFile('src/app/lazy-a/lazy-a.module.ts', `
       import * as moment from 'moment';
       console.log(moment);
diff --git a/tests/legacy-cli/e2e/tests/misc/dedupe-duplicate-modules.ts b/tests/legacy-cli/e2e/tests/misc/dedupe-duplicate-modules.ts
index 090a7587be..4dabe72940 100644
--- a/tests/legacy-cli/e2e/tests/misc/dedupe-duplicate-modules.ts
+++ b/tests/legacy-cli/e2e/tests/misc/dedupe-duplicate-modules.ts
@@ -1,5 +1,6 @@
 import { expectFileToMatch, writeFile } from '../../utils/fs';
-import { ng, silentNpm } from '../../utils/process';
+import { installWorkspacePackages } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { updateJsonFile } from '../../utils/project';
 import { expectToFail } from '../../utils/utils';
 
@@ -14,7 +15,7 @@ export default async function () {
     };
   });
 
-  await silentNpm('install');
+  await installWorkspacePackages();
 
   await writeFile('./src/main.ts',
     `
diff --git a/tests/legacy-cli/e2e/tests/misc/lazy-module.ts b/tests/legacy-cli/e2e/tests/misc/lazy-module.ts
index 745a76db63..299ebe5c29 100644
--- a/tests/legacy-cli/e2e/tests/misc/lazy-module.ts
+++ b/tests/legacy-cli/e2e/tests/misc/lazy-module.ts
@@ -1,6 +1,6 @@
 import {readdirSync} from 'fs';
-
-import {ng, silentNpm} from '../../utils/process';
+import { installPackage } from '../../utils/packages';
+import {ng} from '../../utils/process';
 import {appendToFile, writeFile, prependToFile, replaceInFile} from '../../utils/fs';
 
 
@@ -53,7 +53,7 @@ export default function() {
       oldNumberOfFiles = currentNumberOfDistFiles;
     })
     // verify 'import *' syntax doesn't break lazy modules
-    .then(() => silentNpm('install', 'moment'))
+    .then(() => installPackage('moment'))
     .then(() => appendToFile('src/app/app.component.ts', `
       import * as moment from 'moment';
       console.log(moment);
diff --git a/tests/legacy-cli/e2e/tests/misc/module-resolution.ts b/tests/legacy-cli/e2e/tests/misc/module-resolution.ts
index 0396650258..a4db70c883 100644
--- a/tests/legacy-cli/e2e/tests/misc/module-resolution.ts
+++ b/tests/legacy-cli/e2e/tests/misc/module-resolution.ts
@@ -1,5 +1,6 @@
 import { appendToFile, createDir, moveFile, prependToFile } from '../../utils/fs';
-import { ng, silentNpm } from '../../utils/process';
+import { installPackage } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { updateJsonFile } from '../../utils/project';
 import { expectToFail } from '../../utils/utils';
 
@@ -50,11 +51,11 @@ export default async function () {
   await prependToFile('src/app/app.module.ts', 'import * as firebase from \'firebase\';');
   await appendToFile('src/app/app.module.ts', 'firebase.initializeApp({});');
 
-  await silentNpm('install', 'firebase@3.7.8');
+  await installPackage('firebase@3.7.8');
   await ng('build', '--aot');
   await ng('test', '--watch=false');
 
-  await silentNpm('install', 'firebase@4.9.0');
+  await installPackage('firebase@4.9.0');
   await ng('build', '--aot');
   await ng('test', '--watch=false');
 
diff --git a/tests/legacy-cli/e2e/tests/misc/third-party-decorators.ts b/tests/legacy-cli/e2e/tests/misc/third-party-decorators.ts
index 8f6bb0fcf1..40a2b730c1 100644
--- a/tests/legacy-cli/e2e/tests/misc/third-party-decorators.ts
+++ b/tests/legacy-cli/e2e/tests/misc/third-party-decorators.ts
@@ -1,5 +1,6 @@
 import { writeMultipleFiles } from '../../utils/fs';
-import { ng, npm } from '../../utils/process';
+import { installWorkspacePackages } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { updateJsonFile } from '../../utils/project';
 
 export default function () {
@@ -10,7 +11,7 @@ export default function () {
     packageJson['dependencies']['@ngrx/store'] = '^9.1.0';
     packageJson['dependencies']['@ngrx/store-devtools'] = '^9.1.0';
   })
-    .then(() => npm('install'))
+    .then(() => installWorkspacePackages())
     // Create an app that uses ngrx decorators and has e2e tests.
     .then(_ => writeMultipleFiles({
       './e2e/src/app.po.ts': `
diff --git a/tests/legacy-cli/e2e/tests/third-party/bootstrap.ts b/tests/legacy-cli/e2e/tests/third-party/bootstrap.ts
index 91ff0215ce..93e372109f 100644
--- a/tests/legacy-cli/e2e/tests/third-party/bootstrap.ts
+++ b/tests/legacy-cli/e2e/tests/third-party/bootstrap.ts
@@ -1,4 +1,5 @@
-import {silentNpm, ng} from '../../utils/process';
+import { installPackage } from '../../utils/packages';
+import {ng} from '../../utils/process';
 import {updateJsonFile} from '../../utils/project';
 import {expectFileToMatch} from '../../utils/fs';
 import {oneLineTrim} from 'common-tags';
@@ -8,7 +9,7 @@ export default function() {
     // TODO(architect): Delete this test. It is now in devkit/build-angular.
 
   return Promise.resolve()
-    .then(() => silentNpm('install', 'bootstrap@4.0.0-beta.3'))
+    .then(() => installPackage('bootstrap@4.0.0-beta.3'))
     .then(() => updateJsonFile('angular.json', workspaceJson => {
       const appArchitect = workspaceJson.projects['test-project'].architect;
       appArchitect.build.options.styles = [
diff --git a/tests/legacy-cli/e2e/tests/third-party/material-icons.ts b/tests/legacy-cli/e2e/tests/third-party/material-icons.ts
index 4ced68fbac..3b426329ef 100644
--- a/tests/legacy-cli/e2e/tests/third-party/material-icons.ts
+++ b/tests/legacy-cli/e2e/tests/third-party/material-icons.ts
@@ -1,10 +1,11 @@
 import { expectFileToMatch } from '../../utils/fs';
-import { ng, silentNpm } from '../../utils/process';
+import { installPackage } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { updateJsonFile } from '../../utils/project';
 
 export default async function() {
   // Install material design icons
-  await silentNpm('install', 'material-design-icons@3.0.1');
+  await installPackage('material-design-icons@3.0.1');
 
   // Add icon stylesheet to application
   await updateJsonFile('angular.json', workspaceJson => {
diff --git a/tests/legacy-cli/e2e/tests/update/update-1.0.ts b/tests/legacy-cli/e2e/tests/update/update-1.0.ts
index 6d24c8ffeb..bc9cf4b51d 100644
--- a/tests/legacy-cli/e2e/tests/update/update-1.0.ts
+++ b/tests/legacy-cli/e2e/tests/update/update-1.0.ts
@@ -1,5 +1,6 @@
 import { createProjectFromAsset } from '../../utils/assets';
-import { ng, silentNpm } from '../../utils/process';
+import { installWorkspacePackages } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { isPrereleaseCli, useBuiltPackages, useCIChrome, useCIDefaults } from '../../utils/project';
 import { expectToFail } from '../../utils/utils';
 
@@ -12,7 +13,7 @@ export default async function() {
   await expectToFail(() => ng('build'));
   await ng('update', '@angular/cli');
   await useBuiltPackages();
-  await silentNpm('install');
+  await installWorkspacePackages(false);
   await ng('update', '@angular/core', ...extraUpdateArgs);
   await useCIDefaults('one-oh-project');
   await ng('generate', 'component', 'my-comp');
diff --git a/tests/legacy-cli/e2e/tests/update/update-1.7-longhand.ts b/tests/legacy-cli/e2e/tests/update/update-1.7-longhand.ts
index adec63d719..9272ceede0 100644
--- a/tests/legacy-cli/e2e/tests/update/update-1.7-longhand.ts
+++ b/tests/legacy-cli/e2e/tests/update/update-1.7-longhand.ts
@@ -1,5 +1,6 @@
 import { createProjectFromAsset } from '../../utils/assets';
-import { ng, silentNpm } from '../../utils/process';
+import { installWorkspacePackages } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { isPrereleaseCli, useBuiltPackages } from '../../utils/project';
 import { expectToFail } from '../../utils/utils';
 
@@ -11,7 +12,7 @@ export default async function() {
   await expectToFail(() => ng('build'));
   await ng('update', '@angular/cli', '--migrate-only', '--from=1.7.1');
   await useBuiltPackages();
-  await silentNpm('install');
+  await installWorkspacePackages(false);
   await ng('update', '@angular/core', ...extraUpdateArgs);
   await ng('build');
 }
diff --git a/tests/legacy-cli/e2e/tests/update/update-1.7.ts b/tests/legacy-cli/e2e/tests/update/update-1.7.ts
index 3353686384..41f2c02e46 100644
--- a/tests/legacy-cli/e2e/tests/update/update-1.7.ts
+++ b/tests/legacy-cli/e2e/tests/update/update-1.7.ts
@@ -1,6 +1,7 @@
 import * as fs from 'fs';
 import { createProjectFromAsset } from '../../utils/assets';
-import { ng, silentNpm } from '../../utils/process';
+import { installWorkspacePackages } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { isPrereleaseCli, useBuiltPackages, useCIChrome, useCIDefaults } from '../../utils/project';
 import { expectToFail } from '../../utils/utils';
 
@@ -14,7 +15,7 @@ export default async function() {
   await expectToFail(() => ng('build'));
   await ng('update', '@angular/cli');
   await useBuiltPackages();
-  await silentNpm('install');
+  await installWorkspacePackages(false);
   await ng('update', '@angular/core', ...extraUpdateArgs);
   await useCIDefaults('latest-project');
   await ng('generate', 'component', 'my-comp');
diff --git a/tests/legacy-cli/e2e/tests/update/update-7.0.ts b/tests/legacy-cli/e2e/tests/update/update-7.0.ts
index ca10c3739f..a00962bf71 100644
--- a/tests/legacy-cli/e2e/tests/update/update-7.0.ts
+++ b/tests/legacy-cli/e2e/tests/update/update-7.0.ts
@@ -1,5 +1,6 @@
 import { createProjectFromAsset } from '../../utils/assets';
 import { expectFileMatchToExist, expectFileToExist, expectFileToMatch } from '../../utils/fs';
+import { installWorkspacePackages } from '../../utils/packages';
 import { ng, noSilentNg, silentNpm } from '../../utils/process';
 import { isPrereleaseCli, useBuiltPackages, useCIChrome, useCIDefaults } from '../../utils/project';
 import { expectToFail } from '../../utils/utils';
@@ -27,11 +28,12 @@ export default async function() {
   await useCIChrome('src/');
   await useCIChrome('e2e/');
   await useCIDefaults('seven-oh-project');
-  await silentNpm('install');
+  await installWorkspacePackages(false);
 
   // Update Angular.
   const extraUpdateArgs = (await isPrereleaseCli()) ? ['--next', '--force'] : [];
   await ng('update', '@angular/core', ...extraUpdateArgs);
+  await silentNpm('run', 'webdriver-update');
 
   // Run CLI commands.
   await ng('generate', 'component', 'my-comp');
diff --git a/tests/legacy-cli/e2e/tests/update/update.ts b/tests/legacy-cli/e2e/tests/update/update.ts
index 2ed02ee658..b06f6d84fb 100644
--- a/tests/legacy-cli/e2e/tests/update/update.ts
+++ b/tests/legacy-cli/e2e/tests/update/update.ts
@@ -1,4 +1,5 @@
-import { ng, silentNpm } from '../../utils/process';
+import { installWorkspacePackages } from '../../utils/packages';
+import { ng } from '../../utils/process';
 import { readFile, writeFile } from '../../utils/fs';
 import { updateJsonFile } from '../../utils/project';
 
@@ -45,5 +46,5 @@ export default function () {
       }
     })
     .then(() => writeFile('package.json', origPackageJson))
-    .then(() => silentNpm('install'));
+    .then(() => installWorkspacePackages());
 }
diff --git a/tests/legacy-cli/e2e/utils/assets.ts b/tests/legacy-cli/e2e/utils/assets.ts
index 742af0bc16..80a7851a78 100644
--- a/tests/legacy-cli/e2e/utils/assets.ts
+++ b/tests/legacy-cli/e2e/utils/assets.ts
@@ -3,8 +3,8 @@ import * as glob from 'glob';
 import { getGlobalVariable } from './env';
 import { relative, resolve } from 'path';
 import { copyFile, writeFile } from './fs';
+import { installWorkspacePackages } from './packages';
 import { useBuiltPackages } from './project';
-import { silentNpm } from './process';
 
 export function assetDir(assetName: string) {
   return join(__dirname, '../assets', assetName);
@@ -53,7 +53,7 @@ export async function createProjectFromAsset(
   }
 
   if (!skipInstall) {
-    await silentNpm('install');
+    await installWorkspacePackages(false);
   }
 
   return dir;
diff --git a/tests/legacy-cli/e2e/utils/packages.ts b/tests/legacy-cli/e2e/utils/packages.ts
new file mode 100644
index 0000000000..4107f4d5d3
--- /dev/null
+++ b/tests/legacy-cli/e2e/utils/packages.ts
@@ -0,0 +1,46 @@
+import { getGlobalVariable } from './env';
+import { ProcessOutput, silentNpm, silentYarn } from './process';
+
+export function getActivePackageManager(): 'npm' | 'yarn' {
+  const value = getGlobalVariable('package-manager');
+  if (value && value !== 'npm' && value !== 'yarn') {
+    throw new Error('Invalid package manager value: ' + value);
+  }
+
+  return value || 'npm';
+}
+
+export async function installWorkspacePackages(updateWebdriver = true): Promise<void> {
+  switch (getActivePackageManager()) {
+    case 'npm':
+      await silentNpm('install');
+      if (updateWebdriver) {
+        await silentNpm('run', 'webdriver-update');
+      }
+      break;
+    case 'yarn':
+      await silentYarn();
+      if (updateWebdriver) {
+        await silentYarn('webdriver-update');
+      }
+      break;
+  }
+}
+
+export async function installPackage(specifier: string): Promise<ProcessOutput> {
+  switch (getActivePackageManager()) {
+    case 'npm':
+      return silentNpm('install', specifier);
+    case 'yarn':
+      return silentYarn('add', specifier);
+  }
+}
+
+export async function uninstallPackage(name: string): Promise<ProcessOutput> {
+  switch (getActivePackageManager()) {
+    case 'npm':
+      return silentNpm('uninstall', name);
+    case 'yarn':
+      return silentYarn('remove', name);
+  }
+}
diff --git a/tests/legacy-cli/e2e/utils/project.ts b/tests/legacy-cli/e2e/utils/project.ts
index e494e8f35c..02d10a1526 100644
--- a/tests/legacy-cli/e2e/utils/project.ts
+++ b/tests/legacy-cli/e2e/utils/project.ts
@@ -4,7 +4,8 @@ import { packages } from '../../../../lib/packages';
 import { getGlobalVariable } from './env';
 import { prependToFile, readFile, replaceInFile, writeFile } from './fs';
 import { gitCommit } from './git';
-import { execAndWaitForOutputToMatch, git, ng, npm, silentNpm } from './process';
+import { installWorkspacePackages } from './packages';
+import { execAndWaitForOutputToMatch, git, ng, npm } from './process';
 
 const tsConfigPath = 'tsconfig.json';
 
@@ -94,9 +95,7 @@ export async function prepareProjectForE2e(name) {
   console.log(
     `Project ${name} created... Installing npm.`,
   );
-  await silentNpm(
-    'install',
-  );
+  await installWorkspacePackages(false);
   await useCIDefaults(
     name,
   );
diff --git a/tests/legacy-cli/e2e_runner.ts b/tests/legacy-cli/e2e_runner.ts
index 68c945fd62..d5ff300bf0 100644
--- a/tests/legacy-cli/e2e_runner.ts
+++ b/tests/legacy-cli/e2e_runner.ts
@@ -143,6 +143,7 @@ if (testsToRun.length == allTests.length) {
 }
 
 setGlobalVariable('argv', argv);
+setGlobalVariable('package-manager', argv.yarn ? 'yarn' : 'npm');
 
 // Setup local package registry
 const registryPath =