Unit test for custom schematics fails with 'cannot find nx.json'

Expected Behavior

I can run unit test for custom schematics, without getting errors that are related to the way I use the schematics testing framework.

Current Behavior

We have some custom schematics for generating apps, libs, components etc. Nothing fancy in particular. I’m in the process of writing unit tests for these schematics, but I fail to succeed on this. While the actually schematic is running fine, I cannot get the unit test to work.

Steps to Reproduce

I have a basic schematic that is adding some sugar to generating a new app. I’m chaining on ‘’@nrwl/schematics’, ‘application’'.

here is my test:

import { SchematicTestRunner, UnitTestTree } from '@angular-devkit/schematics/testing';
import * as path from 'path';

const collectionPath = path.join(__dirname, '../collection.json');

describe('funnel', () => {
  let runner: SchematicTestRunner;
  let workspaceTree: UnitTestTree;

  beforeEach(() => {
    runner = new SchematicTestRunner('funnel', collectionPath);
    workspaceTree = runner.runSchematic('funnel');
  });

it('should have done something', () => {
      const contents = workspaceTree.readContent('/angular.json');

// other content of the test left out
     
    });

it already fails on getting the workspaceTree. I get the following error:

Cannot find nx.json

      at Object.readJsonInTree (../../node_modules/@nrwl/schematics/src/utils/ast-utils.js:415:15)
      at Object.getNpmScope (../../node_modules/@nrwl/schematics/src/utils/cli-config-utils.js:19:24)
      at normalizeOptions (../../node_modules/@nrwl/schematics/src/collection/application/index.js:365:44)
      at ../../node_modules/@nrwl/schematics/src/collection/application/index.js:285:23

Context

• version of Nx used: 7.8.6
• version of Angular CLI used: 7.1.0
• version of Angular DevKit used7.1.0

I’m sure I’m overlooking something 😃. Thanks for any suggestions.

[evtk]

I’m sorry to say that I actually never managed to fix it, so finally decided to remove the unit tests for the schematics.

[mehrad-rafigh]

Somewhat good news. I managed to get passed the cannot find nx.json Problem. But now I get Cannot read property ‘engineHost’ of null which comes from here