@tjoskar/react-lazyload-img/dist/es2015/test/lazyload.test.js

Lazy image loader for react

import { spy } from 'simple-spy';
import { call } from '../lazyload';
describe('call', () => {
    test('Should not throw if function is not defind', () => {
        // Arrange
        const fn = undefined;
        // Act and assert
        expect(() => call(fn)).not.toThrow();
    });
    test('Should call function', () => {
        // Arrange
        const fn = spy();
        // Act
        call(fn);
        // Assert
        expect(fn.callCount).toBe(1);
    });
});
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