41 lines
1.3 KiB
JavaScript
41 lines
1.3 KiB
JavaScript
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/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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*/
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import {getDisplayName} from 'react-devtools-shared/src/utils';
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describe('utils', () => {
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describe('getDisplayName', () => {
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it('should return a function name', () => {
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function FauxComponent() {}
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expect(getDisplayName(FauxComponent)).toEqual('FauxComponent');
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});
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it('should return a displayName name if specified', () => {
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function FauxComponent() {}
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FauxComponent.displayName = 'OverrideDisplayName';
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expect(getDisplayName(FauxComponent)).toEqual('OverrideDisplayName');
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});
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it('should return the fallback for anonymous functions', () => {
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expect(getDisplayName(() => {}, 'Fallback')).toEqual('Fallback');
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});
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it('should return Anonymous for anonymous functions without a fallback', () => {
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expect(getDisplayName(() => {})).toEqual('Anonymous');
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});
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// Simulate a reported bug:
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// https://github.com/facebook/react/issues/16685
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it('should return a fallback when the name prop is not a string', () => {
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const FauxComponent = {name: {}};
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expect(getDisplayName(FauxComponent, 'Fallback')).toEqual('Fallback');
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});
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});
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});
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