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https://github.com/zhigang1992/react-native.git
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47e061549f
Summary: I was looking at the coverage report of the JavaScript code in the `Libraries` folder, and found some of the modules and functions to be (partially) untested. I believe that adding tests to them would formally capture their behaviour and avoid future regressions. In this PR, I've added some unit tests for 3 utility components. Perhaps a more general question: Are these kinds of PRs appreciated? I'd be interested in submitting more of them in the future. Not applicable, since it only adds tests. Pull Request resolved: https://github.com/facebook/react-native/pull/23903 Differential Revision: D14477601 Pulled By: cpojer fbshipit-source-id: c0700c5b514cd0df983fecfd91c93fc2bd049f5d
66 lines
1.9 KiB
JavaScript
66 lines
1.9 KiB
JavaScript
/**
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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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* @format
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* @emails oncall+react_native
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*/
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'use strict';
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describe('truncate', () => {
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const truncate = require('truncate');
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it('should truncate', () => {
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expect(truncate('Hello, world.', 5)).toBe('He...');
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});
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it('should not truncate', () => {
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expect(truncate('Hello, world.', 50)).toBe('Hello, world.');
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});
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it('should not truncate more than minDelta chars.', () => {
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expect(truncate('Hello, world.', 7, {minDelta: 10})).toBe('Hello, world.');
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expect(truncate('Hello, world.', 7, {minDelta: 9})).toBe('Hell...');
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});
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it('should break in the middle of words', () => {
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expect(
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truncate('Hello, world. How are you?', 18, {breakOnWords: false}),
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).toBe('Hello, world. H...');
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expect(
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truncate('Hello, world.\nHow are you?', 18, {breakOnWords: false}),
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).toBe('Hello, world.\nHo...');
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});
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it('should add another character if the truncations happens in the middle of a wide char', () => {
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expect(
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truncate('Hello, world. āA weird character', 18, {breakOnWords: false}),
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).toBe('Hello, world. āA...');
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});
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it('should break at word boundaries', () => {
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expect(
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truncate('Hello, world. How are you?', 18, {breakOnWords: true}),
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).toBe('Hello, world....');
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expect(
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truncate('Hello, world.\nHow are you?', 18, {breakOnWords: true}),
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).toBe('Hello, world....');
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});
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it('should uses custom elipses', () => {
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expect(truncate('Hello, world.', 9, {elipsis: '·'})).toBe(
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'He·',
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);
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});
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it("shouldn't barf with weird input", () => {
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expect(truncate('Hello, world.', 0)).toBe('Hello,...');
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expect(truncate('Hello, world.', -132)).toBe('...');
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expect(truncate('', 0)).toBe('');
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expect(truncate(null, 0)).toBe(null);
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});
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});
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