diff --git a/packages/cli/src/lib/decorators/preconditions/binPreconditionsFactory.ts b/packages/cli/src/lib/decorators/preconditions/binPreconditionsFactory.ts
index c4304049f0..8da8f63ebc 100644
--- a/packages/cli/src/lib/decorators/preconditions/binPreconditionsFactory.ts
+++ b/packages/cli/src/lib/decorators/preconditions/binPreconditionsFactory.ts
@@ -5,7 +5,7 @@ import {satisfies, validRange} from 'semver';
 
 export interface IBinPreconditionsOptions {
   params?: Array<string>;
-  prettyName?: string;
+  prettyName: string;
   installLink?: string;
   howToInstallBinText?: string;
 }
@@ -30,12 +30,12 @@ function hasAutoFix(
 
 export function getBinVersionPrecondition(
   binaryName: string,
-  options?: IBinPreconditionsOptions
+  options: IBinPreconditionsOptions
 ) {
   const appliedOptions: Required<IBinPreconditionsOptions> = {
     ...defaultOptions,
     ...options,
-    prettyName: options?.prettyName || binaryName,
+    prettyName: options.prettyName,
   };
   return function (versionRange: string) {
     return async function (target: Command) {
@@ -72,12 +72,12 @@ export function getBinVersionPrecondition(
 
 export function getBinInstalledPrecondition(
   binaryName: string,
-  options?: IBinPreconditionsOptions | IBinPreconditionsOptionsWithAutoFix
+  options: IBinPreconditionsOptions | IBinPreconditionsOptionsWithAutoFix
 ) {
   const appliedOptions: Required<IBinPreconditionsOptions> = {
     ...defaultOptions,
     ...options,
-    prettyName: options?.prettyName ?? binaryName,
+    prettyName: options.prettyName,
   };
   return function () {
     return async function (target: Command): Promise<Boolean> {
diff --git a/packages/cli/src/lib/decorators/preconditions/ng.spec.ts b/packages/cli/src/lib/decorators/preconditions/ng.spec.ts
new file mode 100644
index 0000000000..29799017fe
--- /dev/null
+++ b/packages/cli/src/lib/decorators/preconditions/ng.spec.ts
@@ -0,0 +1,139 @@
+jest.mock('../../utils/process');
+jest.mock('../../utils/misc');
+jest.mock('cli-ux');
+
+import {dedent} from 'ts-dedent';
+import {constants} from 'os';
+import {mocked} from 'ts-jest/utils';
+import {spawnProcessOutput, spawnProcess} from '../../utils/process';
+import {getFakeCommand} from './testsUtils/utils';
+import {cli} from 'cli-ux';
+
+import {IsNgInstalled} from './ng';
+import type {Command} from '@oclif/command';
+import {appendCmdIfWindows} from '../../utils/os';
+import {getPackageVersion} from '../../utils/misc';
+
+describe('IsNgInstalled', () => {
+  const mockedSpawnProcessOutput = mocked(spawnProcessOutput);
+  const mockedSpawnProcess = mocked(spawnProcess);
+  const mockedGetPackageVersion = mocked(getPackageVersion);
+  const mockedCliUx = mocked(cli, true);
+  const mockConfirm = () => {
+    Object.defineProperty(cli, 'confirm', {value: jest.fn()});
+  };
+
+  let fakeCommand: Command;
+
+  beforeAll(() => {
+    mockConfirm();
+  });
+
+  beforeEach(() => {
+    jest.resetAllMocks();
+    fakeCommand = getFakeCommand();
+    mockedGetPackageVersion.mockReturnValue('1.0.0');
+  });
+
+  describe('when ng is not installed', () => {
+    beforeEach(() => {
+      mockedSpawnProcessOutput.mockResolvedValue({
+        exitCode: constants.errno.ENOENT,
+        stderr: 'spawn ng ENOENT',
+        stdout: '',
+      });
+    });
+
+    it('should ask the user if he want to install the Angular CLI now', async () => {
+      mockedCliUx.confirm.mockReturnValueOnce(Promise.resolve(false));
+
+      await IsNgInstalled()(fakeCommand);
+
+      expect(mockedCliUx.confirm).toHaveBeenCalledTimes(1);
+      expect(mockedCliUx.confirm).toHaveBeenCalledWith(
+        dedent`
+        You need to have the Angular-CLI installed on your computer before proceeding.
+        Do you want to install it now? (y/n)`
+      );
+    });
+
+    describe('when the user agree to install the Angular CLI', () => {
+      beforeEach(() => {
+        mockedCliUx.confirm.mockReturnValueOnce(Promise.resolve(true));
+      });
+
+      it('should start the installation of @angular/cli', async () => {
+        await IsNgInstalled()(fakeCommand);
+
+        expect(mockedSpawnProcess).toHaveBeenCalledWith(
+          expect.stringContaining('npm'),
+          ['install', '-g', '@angular/cli@1.0.0']
+        );
+      });
+
+      describe('when the installation is succesful', () => {
+        beforeEach(() => {
+          mockedSpawnProcess.mockReturnValueOnce(Promise.resolve(0));
+        });
+
+        it('should return true and not warn', async () => {
+          await expect(IsNgInstalled()(fakeCommand)).resolves.toBe(true);
+          expect(fakeCommand.warn).toHaveBeenCalledTimes(0);
+        });
+      });
+
+      describe('when the installation fails', () => {
+        beforeEach(() => {
+          mockedSpawnProcess.mockReturnValueOnce(Promise.resolve(1));
+        });
+
+        it('should return false and ask the user to install Angular-CLI and retry afteward', async () => {
+          await expect(IsNgInstalled()(fakeCommand)).resolves.toBe(false);
+          expect(fakeCommand.warn).toHaveBeenCalledTimes(1);
+          expect(fakeCommand.warn).toHaveBeenCalledWith(dedent`
+          Angular installation failed, ${fakeCommand.id} cannot proceed.
+          Please try to install Angular-CLI first then try again.
+          `);
+        });
+      });
+    });
+  });
+
+  describe('when an unknown error happens while checking for ng', () => {
+    beforeEach(() => {
+      mockedSpawnProcessOutput.mockResolvedValue({
+        exitCode: 1,
+        stderr: 'some random error oh no',
+        stdout: '',
+      });
+    });
+
+    it('should return false and warn', async () => {
+      await expect(IsNgInstalled()(fakeCommand)).resolves.toBe(false);
+      expect(fakeCommand.warn).toHaveBeenCalledTimes(2);
+      expect(fakeCommand.warn).toHaveBeenCalledWith(dedent`
+        foo requires a valid Angular-CLI installation to run.
+        An unknown error happened while running ${appendCmdIfWindows`ng`} --version.
+        some random error oh no
+      `);
+      expect(fakeCommand.warn).toHaveBeenCalledWith(dedent`
+        Please visit https://angular.io/guide/setup-local#install-the-angular-cli for more detailed installation information.
+      `);
+    });
+  });
+
+  describe('when ng is installed', () => {
+    beforeEach(() => {
+      mockedSpawnProcessOutput.mockResolvedValue({
+        exitCode: 0,
+        stderr: '',
+        stdout: '',
+      });
+    });
+
+    it('should return true and not warn', async () => {
+      await expect(IsNgInstalled()(fakeCommand)).resolves.toBe(true);
+      expect(fakeCommand.warn).toHaveBeenCalledTimes(0);
+    });
+  });
+});
diff --git a/packages/cli/src/lib/decorators/preconditions/ng.ts b/packages/cli/src/lib/decorators/preconditions/ng.ts
index 9f80aaaab5..950d570d1b 100644
--- a/packages/cli/src/lib/decorators/preconditions/ng.ts
+++ b/packages/cli/src/lib/decorators/preconditions/ng.ts
@@ -26,7 +26,7 @@ async function installAngularCli(target: Command): Promise<boolean> {
   if (output === 0) {
     return true;
   }
-  cli.warn(dedent`
+  target.warn(dedent`
     Angular installation failed, ${target.id} cannot proceed.
     Please try to install Angular-CLI first then try again.
     `);
@@ -37,8 +37,7 @@ export const IsNgInstalled = getBinInstalledPrecondition(
   appendCmdIfWindows`ng`,
   {
     prettyName: 'Angular-CLI',
-    installLink:
-      'https://angular.io/guide/setup-local#install-the-angular-cli>',
+    installLink: 'https://angular.io/guide/setup-local#install-the-angular-cli',
     installFunction: installAngularCli,
   }
 );
diff --git a/packages/cli/src/lib/decorators/preconditions/testsUtils/utils.ts b/packages/cli/src/lib/decorators/preconditions/testsUtils/utils.ts
index a59df04b2f..ec9d4edf62 100644
--- a/packages/cli/src/lib/decorators/preconditions/testsUtils/utils.ts
+++ b/packages/cli/src/lib/decorators/preconditions/testsUtils/utils.ts
@@ -4,6 +4,7 @@ export const getFakeCommand = (): Command => {
   const fakeCommand = {
     id: 'foo',
     warn: jest.fn(),
+    log: jest.fn(),
   };
 
   return fakeCommand as unknown as Command;