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Running tests occasionally fail due to TypeError

See original GitHub issue

Detailed description

Describe in detail the issue you’re having.

The tests occasionally fail due to a TypeError as shown below:

HeadlessChrome 0.0.0 (Mac OS X 10.14.6) ERROR
  {
    "message": "An error was thrown in afterAll\nUncaught TypeError: Cannot read property 'offsetWidth' of null thrown",
    "str": "An error was thrown in afterAll\nUncaught TypeError: Cannot read property 'offsetWidth' of null thrown"
  }
HeadlessChrome 0.0.0 (Mac OS X 10.14.6): Executed 152 of 205 (skipped 13) ERROR (0 secs / 2.421 secs)
HeadlessChrome 0.0.0 (Mac OS X 10.14.6) ERROR
  {
    "message": "An error was thrown in afterAll\nUncaught TypeError: Cannot read property 'offsetWidth' of null thrown",
    "str": "An error was thrown in afterAll\nUncaught TypeError: Cannot read property 'offsetWidth' of null thrown"
HeadlessChrome 0.0.0 (Mac OS X 10.14.6): Executed 152 of 205 (skipped 13) ERROR (2.694 secs / 2.421 secs)

The message also sometimes changes:

HeadlessChrome 0.0.0 (Mac OS X 10.14.6) Modal should close modal when escape is pressed FAILED
	Uncaught TypeError: Cannot read property 'offsetWidth' of null thrown
HeadlessChrome 0.0.0 (Mac OS X 10.14.6): Executed 99 of 208 (1 FAILED) (skipped 13) (0 secs / 2.424 secs)


HeadlessChrome 0.0.0 (Mac OS X 10.14.6) GridDirective should render a column FAILED
	Uncaught TypeError: Cannot read property 'offsetWidth' of null thrown
HeadlessChrome 0.0.0 (Mac OS X 10.14.6): Executed 119 of 208 (1 FAILED) (skipped 7) (0 secs / 2.705 secs)


HeadlessChrome 0.0.0 (Mac OS X 10.14.6) Toggle should change state FAILED
	Uncaught TypeError: Cannot read property 'offsetWidth' of null thrown
HeadlessChrome 0.0.0 (Mac OS X 10.14.6): Executed 113 of 208 (1 FAILED) (skipped 9) (0 secs / 2.323 secs)

This comes up sometimes on travis as well:


HeadlessChrome 0.0.0 (Linux 0.0.0) ERROR
  {
    "message": "An error was thrown in afterAll\nUncaught TypeError: Cannot read property 'offsetWidth' of null thrown",
    "str": "An error was thrown in afterAll\nUncaught TypeError: Cannot read property 'offsetWidth' of null thrown"
  }
HeadlessChrome 0.0.0 (Linux 0.0.0): Executed 196 of 214 (skipped 2) ERROR (0 secs / 6.468 secs)
HeadlessChrome 0.0.0 (Linux 0.0.0) ERROR
  {
    "message": "An error was thrown in afterAll\nUncaught TypeError: Cannot read property 'offsetWidth' of null thrown",
    "str": "An error was thrown in afterAll\nUncaught TypeError: Cannot read property 'offsetWidth' of null thrown"
  }
e 0.0.0 (Linux 0.0.0): Executed 196 of 214 (skipped 2) ERROR (7.225 secs / 6.468 secs)
npm ERR! Test failed.  See above for more details.
The command "npm run lint && npm test" exited with 1.