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odin-default-js-exercises
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Merge 2b1b1cb508 into 0747078d97

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Shen 2022-03-30 10:54:10 +11:00 committed by GitHub
parent 0747078d97 2b1b1cb508
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42
08_calculator/calculator.spec.js
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@ -39,22 +39,62 @@ describe('sum', () => {
}); });
describe('multiply', () => { describe('multiply', () => {
test.skip('computes the product of an empty array', () => {
expect(calculator.multiply([])).toBe(0);
});
test.skip('multiplies two numbers', () => { test.skip('multiplies two numbers', () => {
expect(calculator.multiply([2,4])).toBe(8); expect(calculator.multiply([2,4])).toBe(8);
}); });
test.skip('multiplies several numbers', () => { test.skip('multiplies several numbers', () => {
expect(calculator.multiply([2,4,6,8,10,12,14])).toBe(645120); expect(calculator.multiply([2,4,6,8,10,12,14])).toBe(645120);
}); });
}); });
/*
* Base facts:
* => x to the power of 0 is always 1.
* => with base of 0, the exponent must NOT be negative, otherwise the result will be Infinity.
*/
describe('power', () => { describe('power', () => {
test.skip('raises one number to the power of another number', () => { test.skip('raises one number to the power of another number', () => {
expect(calculator.power(4,3)).toBe(64); // 4 to third power is 64 expect(calculator.power(4,3)).toBe(64); // 4 to third power is 64
}); });
test.skip('to the negative exponent', () => {
expect(calculator.power(2,-2)).toBe(0.25);
});
test.skip('with negative base', () => {
expect(calculator.power(-2,2)).toBe(4);
});
test.skip('with negative base', () => {
expect(calculator.power(-2,3)).toBe(-8);
});
test.skip('negative base to the negative exponent', () => {
expect(calculator.power(-2,-2)).toBe(0.25);
});
test.skip('negative base to the negative exponent', () => {
expect(calculator.power(-2,-3)).toBe(-0.125);
});
test.skip('to the power of 0', () => {
expect(calculator.power(2,0)).toBe(1);
});
test.skip('to the power of 0', () => {
expect(calculator.power(-2,0)).toBe(1);
});
test.skip('to the power of 0', () => {
expect(calculator.power(0,0)).toBe(1);
});
test.skip('with base of 0', () => {
expect(calculator.power(0,2)).toBe(0);
});
test.skip('with base of 0', () => {
expect(calculator.power(0,-2)).toBe(Infinity);
});
}); });
describe('factorial', () => { describe('factorial', () => {
test.skip('factorial of negative number should be undefined', () => {
expect(calculator.factorial(-1)).toBeUndefined();
});
test.skip('computes the factorial of 0', () => { test.skip('computes the factorial of 0', () => {
expect(calculator.factorial(0)).toBe(1); // 0! = 1 expect(calculator.factorial(0)).toBe(1); // 0! = 1
}); });