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react-test-renderer: improve findByType() error message #17439

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merged 3 commits into from Feb 28, 2020
Merged

react-test-renderer: improve findByType() error message #17439

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47c1509
improve findByType error message
henryqdineen Nov 23, 2019
74a3e77
fix flow typing
henryqdineen Nov 23, 2019
72ff92a
Adding a test for the "Unknown" branch when `getComponentName()` retu…
henryqdineen Feb 28, 2020
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3 changes: 2 additions & 1 deletion packages/react-test-renderer/src/ReactTestRenderer.js
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Expand Up @@ -42,6 +42,7 @@ import {
ScopeComponent,
} from 'shared/ReactWorkTags';
import invariant from 'shared/invariant';
import getComponentName from 'shared/getComponentName';
import ReactVersion from 'shared/ReactVersion';

import {getPublicInstance} from './ReactTestHostConfig';
Expand Down Expand Up @@ -346,7 +347,7 @@ class ReactTestInstance {
findByType(type: any): ReactTestInstance {
return expectOne(
this.findAllByType(type, {deep: false}),
`with node type: "${type.displayName || type.name}"`,
`with node type: "${getComponentName(type) || 'Unknown'}"`,
);
}

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10 changes: 10 additions & 0 deletions packages/react-test-renderer/src/__tests__/ReactTestRenderer-test.internal.js
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Expand Up @@ -1022,4 +1022,14 @@ describe('ReactTestRenderer', () => {
expect(Scheduler).toFlushWithoutYielding();
ReactTestRenderer.create(<App />);
});

it('calling findByType() with an invalid component will fall back to "Unknown" for component name', () => {
const App = () => null;
const renderer = ReactTestRenderer.create(<App />);
const NonComponent = {};

expect(() => {
renderer.root.findByType(NonComponent);
}).toThrowError(`No instances found with node type: "Unknown"`);
});
});