| 1 | import externalToFn from './external-to-fn';
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| 2 |
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| 3 | describe('#externalToFn', () => {
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| 4 | describe('when passed a function', () => {
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| 5 | it('returns the same function', () => {
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| 6 | const fn = () => true;
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| 7 | expect(externalToFn(fn)).toBe(fn);
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| 8 | });
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| 9 | });
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| 10 |
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| 11 | describe('when passed an array of module names', () => {
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| 12 | it('returns a predicate returning true if passed one of the module names', () => {
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| 13 | const modules = ['lodash', 'lodash-es'];
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| 14 | const fn = externalToFn(modules);
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| 15 |
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| 16 | expect(fn('lodash')).toBe(true);
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| 17 | expect(fn('lodash-')).toBe(false);
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| 18 | expect(fn('lodash-es')).toBe(true);
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| 19 | expect(fn('lodash/map')).toBe(false);
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| 20 | });
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| 21 | });
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| 22 |
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| 23 | describe('when passed anything but a function or array', () => {
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| 24 | it('throws an error', () => {
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| 25 | expect(() => externalToFn('string')).toThrow();
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| 26 | });
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| 27 | });
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| 28 | });
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