21 lines
494 B
JavaScript
21 lines
494 B
JavaScript
const expect = require('expect');
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let output = '';
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const functionName = fn => fn.name;
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test('functionName is a Function', () => {
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expect(functionName).toBeInstanceOf(Function);
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});
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test('Works for native functions', () => {
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expect(functionName(Math.max)).toBe('max');
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});
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function fun(x) {
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return x;
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}
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test('Works for functions', () => {
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expect(functionName(fun)).toBe('fun');
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});
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const fn = x => x;
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test('Works for arrow functions', () => {
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expect(functionName(fn)).toBe('fn');
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});
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