test: migrate features/enable to @oclif/test v4

Author: eablack

packages/cli/test/unit/commands/features/enable.unit.test.ts

@@ -0,0 +1,33 @@
+import {runCommand} from '@oclif/test'
+import {expect} from 'chai'
+import nock from 'nock'
+import stripAnsi from 'strip-ansi'
+
+describe('features:enable', function () {
+  afterEach(() => nock.cleanAll())
+
+  it('enables an app feature', async () => {
+    nock('https://api.heroku.com:443')
+      .get('/apps/myapp/features/feature-a')
+      .reply(200, {enabled: false})
+      .patch('/apps/myapp/features/feature-a', {enabled: true})
+      .reply(200)
+
+    const {stdout, stderr} = await runCommand(['features:enable', 'feature-a', '--app', 'myapp'])
+
+    expect(stdout).to.equal('')
+    expect(stderr).to.contain('Enabling feature-a for')
+    expect(stderr).to.contain('myapp')
+    expect(stderr).to.contain('done')
+  })
+
+  it('errors if feature is already enabled', async () => {
+    nock('https://api.heroku.com:443')
+      .get('/apps/myapp/features/feature-a')
+      .reply(200, {enabled: true})
+
+    const {error} = await runCommand(['features:enable', '-a', 'myapp', 'feature-a'])
+
+    expect(stripAnsi(error?.message || '')).to.equal('feature-a is already enabled.')
+  })
+})