75 lines
2.6 KiB
JavaScript
75 lines
2.6 KiB
JavaScript
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const shuffle = require('../../../../src/common/utils/shuffle');
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describe('shuffle', () => {
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test('Should return a shuffle array (same size, different order)', async () => {
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// arrange
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const tArray = [1,2,3,4,5,6,7,8,9];
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// act
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const result = shuffle(tArray);
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// assert
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expect(result).toHaveLength(tArray.length);
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expect(result).not.toEqual(tArray);
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});
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test('Should return a shuffle array for array of size 1', async () => {
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// arrange
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const tArray = [1];
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// act
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const result = shuffle(tArray);
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// assert
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expect(result).toHaveLength(tArray.length);
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expect(result).toEqual(tArray);
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});
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test('Should return a shuffle array for array of size 0', async () => {
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// arrange
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const tArray = [];
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// act
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const result = shuffle(tArray);
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// assert
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expect(result).toHaveLength(tArray.length);
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expect(result).toEqual(tArray);
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});
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test('Should return a shuffle only from a starting point', async () => {
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// arrange
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const tArray = [1,2,3,4,5,6,7,8,9];
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// act
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const result = shuffle(tArray, 2);
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// assert
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expect(result).toHaveLength(tArray.length);
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expect(result).not.toEqual(tArray);
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const fixedOrigin = [...tArray].splice(0, 2);
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const shuffledOrigin = [...tArray].splice(2);
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const fixedResult= [...result].splice(0, 2);
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const shuffledResult = [...result].splice(2);
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expect(fixedResult).toHaveLength(fixedOrigin.length);
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expect(fixedResult).toEqual(fixedOrigin);
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expect(shuffledResult).toHaveLength(shuffledOrigin.length);
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expect(shuffledResult).not.toEqual(shuffledOrigin);
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});
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test('Should return a shuffle only from a starting point to and end point', async () => {
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// arrange
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const tArray = [1,2,3,4,5,6,7,8,9];
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// act
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const result = shuffle(tArray, 2, 4);
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// assert
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expect(result).toHaveLength(tArray.length);
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expect(result).not.toEqual(tArray);
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const fixedStartOrigin = [...tArray].splice(0, 2);
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const fixedEndOrigin = [...tArray].splice(4);
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const shuffledOrigin = [...tArray].splice(2, 4);
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const fixedStartResult= [...result].splice(0, 2);
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const fixedEndResult = [...tArray].splice(4);
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const shuffledResult = [...result].splice(2, 4);
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expect(fixedStartResult).toHaveLength(fixedStartOrigin.length);
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expect(fixedStartResult).toEqual(fixedStartOrigin);
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expect(fixedEndResult).toHaveLength(fixedEndOrigin.length);
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expect(fixedEndResult).toEqual(fixedEndOrigin);
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expect(shuffledResult).toHaveLength(shuffledOrigin.length);
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expect(shuffledResult).not.toEqual(shuffledOrigin);
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});
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});
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