TypeError: Function.prototype.name sham getter called on non-function

[Ridermansb]

Current behavior

When run with --coverage i get this error..

TypeError: Function.prototype.name sham getter called on non-function

● <ErrorBoundary> component › should render with message if error occour

TypeError: Function.prototype.name sham getter called on non-function

  20 | 		);
  21 |
> 22 | 		expect(wrapper).toMatchSnapshot();
     | 		                ^
  23 | 	});
  24 |
  25 | 	it("should render if error occour", function() {

  at Function.getName (../node_modules/function.prototype.name/implementation.js:31:9)
  at displayNameOfNode (../node_modules/enzyme-adapter-utils/build/Utils.js:156:95)
  at ReactSixteenAdapter.displayNameOfNode (../node_modules/enzyme-adapter-react-16/build/ReactSixteenAdapter.js:605:62)
  at typeName (../node_modules/enzyme/build/Debug.js:60:43)
  at internalNodeToJson (../node_modules/enzyme-to-json/mount.js:70:31)
  at mountToJson (../node_modules/enzyme-to-json/mount.js:93:12)
  at Object.<anonymous>.exports.default (../node_modules/enzyme-to-json/index.js:14:32)
  at Object.print (../node_modules/enzyme-to-json/createSerializer.js:22:40)
  at printPlugin (../node_modules/pretty-format/build/index.js:287:16)
  at prettyFormat (../node_modules/pretty-format/build/index.js:485:16)
  at Object.throwingMatcher (../node_modules/expect/build/index.js:320:33)
  at Object.toMatchSnapshot (src/components/molecules/ErrorBoundary/ErrorBoundary.test.jsx:22:19)

`

If I not run with coverage, everything works fine

Question posted on Stackoverflow

Expected behavior

Run tests with coverage without error

Your environment

• macOS Mojave 10.14.1 .
• node 10.11.0
• npm 6.4.1
• yarn 1.10.1
• zsh
• lerna 2.11.0

API

• shallow
• mount
• render

Version

library	version
enzyme	3.7.0
react	16.4.1
react-dom	16.4.1
react-test-renderer
adapter (below)

Adapter

• enzyme-adapter-react-16
• enzyme-adapter-react-16.3
• enzyme-adapter-react-16.2
• enzyme-adapter-react-16.1
• enzyme-adapter-react-15
• enzyme-adapter-react-15.4
• enzyme-adapter-react-14
• enzyme-adapter-react-13
• enzyme-adapter-react-helper
• others ( )

[ljharb]

What’s your test code look like?

[ljharb]

Based on your SO post, you should indeed be explicitly naming your class, but also, this is because your error fallback is a string - and enzyme does not yet support rendering non-elements (see #1149).

For now, you can make your error fallback be a React fragment.

[adamboduch]

Why does this only happen with --coverage?

[ljharb]

It's possible that jest's --coverage code rewriting is introducing a bug.

[ljharb]

The linked SO post is self-answered as resolved; I'm also unable to reproduce this.

I believe it's a bug in enzyme-to-json around anonymous components - I'm closing this until it can be reproduced.