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1
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import createEnhancer from '../enhancer-creator'; |
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2
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3
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describe('createEnhancer can create enhancer', () => { |
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4
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describe('when input function', () => { |
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5
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it('output enhanced function with original name', () => { |
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6
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const orignal = () => {}; |
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7
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const enhancement = input => () => input(); |
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8
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const enhancer = createEnhancer(enhancement); |
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9
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const enhanced = enhancer(orignal); |
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expect(enhanced.name).toBe('orignal'); |
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11
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}); |
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12
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13
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it('output enhanced function invoking enhancement function and orignal function', () => { |
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14
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const enhancementSideEffect = jest.fn(); |
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15
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const orignal = jest.fn(); |
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const enhancer = createEnhancer(input => () => { |
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enhancementSideEffect(); |
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return input(); |
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}); |
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const enhanced = enhancer(orignal); |
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21
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enhanced(); |
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expect(orignal.mock.calls).toHaveLength(1); |
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expect(enhancementSideEffect.mock.calls).toHaveLength(1); |
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}); |
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}); |
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27
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describe('when input function bundle', () => { |
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28
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it('output function bundle of functions name as method names', () => { |
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29
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const functionBundle = { |
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30
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methodA: () => {}, |
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31
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methodB: () => {}, |
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32
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}; |
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33
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const enhancer = createEnhancer(input => () => input()); |
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34
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const enhanced = enhancer(functionBundle); |
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35
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expect(enhanced.methodA.name).toBe('methodA'); |
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expect(enhanced.methodB.name).toBe('methodB'); |
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37
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}); |
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38
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39
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it('output function bundle of functions invoking enhancement function and origial functions', () => { |
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40
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const enhancementSideEffect = jest.fn(); |
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41
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const methodA = jest.fn(); |
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42
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const methodB = jest.fn(); |
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const functionBundle = { |
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44
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methodA, |
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45
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methodB, |
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46
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}; |
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47
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const enhancer = createEnhancer(input => () => { |
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48
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enhancementSideEffect(); |
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49
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return input(); |
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50
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}); |
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51
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const enhanced = enhancer(functionBundle); |
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enhanced.methodA(); |
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53
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expect(methodA.mock.calls).toHaveLength(1); |
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54
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expect(enhancementSideEffect.mock.calls).toHaveLength(1); |
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enhanced.methodB(); |
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56
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expect(methodB.mock.calls).toHaveLength(1); |
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57
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expect(enhancementSideEffect.mock.calls).toHaveLength(2); |
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58
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}); |
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}); |
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60
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61
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it('when input is invalid throws error', () => { |
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62
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const enhancer = createEnhancer(input => () => input()); |
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63
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const doEnhanceStringInput = () => enhancer('test'); |
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64
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expect(doEnhanceStringInput).toThrowErrorMatchingSnapshot(); |
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65
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66
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const doEnhanceInvalidObject = () => |
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enhancer({ |
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foo: 'bar', |
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}); |
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70
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expect(doEnhanceInvalidObject).toThrowErrorMatchingSnapshot(); |
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}); |
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}); |
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Financial-Times /
n-express-enhancer
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This checks looks for references to variables that have not been declared. This is most likey a typographical error or a variable has been renamed.
To learn more about declaring variables in Javascript, see the MDN.