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✅ Add a test for the -Infinity edge case in exercise 1

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Hugo Saracino 2020-12-08 16:52:02 +01:00 committed by Hugo Saracino
parent b98e2a673e
commit 6a45b22df5
1 changed files with 11 additions and 3 deletions
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14
src/exo1/exo1.test.ts
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@ -16,8 +16,9 @@ describe('exo1', () => {
expect(divide(25, 5)).toEqual(5); expect(divide(25, 5)).toEqual(5);
}); });
it('should return Infinity if the denominator is zero', () => { it('should return Infinity or -Infinity if the denominator is zero', () => {
expect(divide(25, 0)).toBe(Infinity); expect(divide(25, 0)).toBe(Infinity);
expect(divide(-25, 0)).toBe(-Infinity);
}); });
}); });
@ -28,6 +29,7 @@ describe('exo1', () => {
it('should return Option.none if the denominator is zero', () => { it('should return Option.none if the denominator is zero', () => {
expect(safeDivide(25, 0)).toStrictEqual(Option.none); expect(safeDivide(25, 0)).toStrictEqual(Option.none);
expect(safeDivide(-25, 0)).toStrictEqual(Option.none);
}); });
}); });
@ -40,6 +42,9 @@ describe('exo1', () => {
expect(safeDivideWithError(25, 0)).toStrictEqual( expect(safeDivideWithError(25, 0)).toStrictEqual(
Either.left(DivisionByZero), Either.left(DivisionByZero),
); );
expect(safeDivideWithError(-25, 0)).toStrictEqual(
Either.left(DivisionByZero),
);
}); });
}); });
@ -52,6 +57,7 @@ describe('exo1', () => {
it('should eventually return Infinity if the denominator is zero', async () => { it('should eventually return Infinity if the denominator is zero', async () => {
await expect(asyncDivide(25, 0)).rejects.toThrow(); await expect(asyncDivide(25, 0)).rejects.toThrow();
await expect(asyncDivide(-25, 0)).rejects.toThrow();
}); });
}); });
@ -63,9 +69,11 @@ describe('exo1', () => {
}); });
it('should eventually return Either.left(DivisionByZero) if the denominator is zero', async () => { it('should eventually return Either.left(DivisionByZero) if the denominator is zero', async () => {
const result = await asyncSafeDivideWithError(25, 0)(); const resultA = await asyncSafeDivideWithError(25, 0)();
const resultB = await asyncSafeDivideWithError(-25, 0)();
expect(result).toStrictEqual(Either.left(DivisionByZero)); expect(resultA).toStrictEqual(Either.left(DivisionByZero));
expect(resultB).toStrictEqual(Either.left(DivisionByZero));
}); });
}); });
}); });