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export class Calculator { | |
public add(firstAddend: number, secondAddend: number): number { | |
return firstAddend + secondAddend; | |
} | |
public subtract(minuend: number, subtrahend: number): number { | |
return minuend - subtrahend; | |
} | |
public multiply(firstFactor: number, secondFactor: number): number { | |
return firstFactor * secondFactor; | |
} | |
public divide(dividend: number, divisor: number): number { | |
if (divisor === 0) { | |
throw Error("cannot divide by zero") | |
} | |
return dividend/divisor; | |
} | |
} | |
describe('Calculator', () => { | |
it('sums up two numbers properly', () => { | |
calculator = new Calculator(); | |
expect(calculator.add(2,2)).to.equal(4); | |
}); | |
it('subtracts two numbers properly', () => { | |
calculator = new Calculator(); | |
expect(calculator.subtract(4,2)).to.equal(2); | |
expect(calculator.subtract(10,3)).to.equal(7); | |
expect(calculator.subtract(-4,2)).to.equal(-6); | |
expect(calculator.subtract(-4,-2)).to.equal(-2); | |
}); | |
it('multiplies two numbers properly', () => { | |
calculator = new Calculator(); | |
expect(calculator.subtract(2,2)).to.equal(4); | |
}); | |
// ✅ test pass, feature is developed properly | |
it('divides two numbers properly', () => { | |
calculator = new Calculator(); | |
expect(calculator.divide(2,2)).to.equal(1); | |
expect(calculator.divide(10,2)).to.equal(5); | |
expect(calculator.divide(7,2)).to.equal(3.5); | |
try{ | |
calculator.divide(7,0); | |
} catch (e) { | |
expect(e.toString()).to.equal("cannot divide by zero"); | |
} | |
}); | |
}); |
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