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62 lines
1.6 KiB
TypeScript
62 lines
1.6 KiB
TypeScript
import { warnOnceInDevelopment } from '../warnOnce';
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let lastWarning: string | null;
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let keepEnv: string | undefined;
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let numCalls = 0;
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let oldConsoleWarn: any;
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describe('warnOnce', () => {
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beforeEach(() => {
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keepEnv = process.env.NODE_ENV;
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numCalls = 0;
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lastWarning = null;
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oldConsoleWarn = console.warn;
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console.warn = (msg: any) => {
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numCalls++;
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lastWarning = msg;
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};
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});
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afterEach(() => {
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process.env.NODE_ENV = keepEnv;
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console.warn = oldConsoleWarn;
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});
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it('actually warns', () => {
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process.env.NODE_ENV = 'development';
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warnOnceInDevelopment('hi');
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expect(lastWarning).toBe('hi');
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expect(numCalls).toEqual(1);
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});
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it('does not warn twice', () => {
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process.env.NODE_ENV = 'development';
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warnOnceInDevelopment('ho');
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warnOnceInDevelopment('ho');
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expect(lastWarning).toEqual('ho');
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expect(numCalls).toEqual(1);
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});
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it('warns two different things once each', () => {
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process.env.NODE_ENV = 'development';
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warnOnceInDevelopment('slow');
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expect(lastWarning).toEqual('slow');
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warnOnceInDevelopment('mo');
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expect(lastWarning).toEqual('mo');
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expect(numCalls).toEqual(2);
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});
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it('does not warn in production', () => {
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process.env.NODE_ENV = 'production';
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warnOnceInDevelopment('lo');
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warnOnceInDevelopment('lo');
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expect(numCalls).toEqual(0);
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});
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it('warns many times in test', () => {
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process.env.NODE_ENV = 'test';
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warnOnceInDevelopment('yo');
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warnOnceInDevelopment('yo');
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expect(lastWarning).toEqual('yo');
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expect(numCalls).toEqual(2);
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});
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});
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