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Add Decimal.minus() unit tests

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This commit is contained in:
Abel Fernández 2020-09-15 10:07:10 +02:00
parent 46680298c8
commit 0975afcb4a
1 changed files with 48 additions and 0 deletions
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48
packages/math/src/decimal.spec.ts
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@ -211,6 +211,54 @@ describe("Decimal", () => {
});
});
describe("minus", () => {
it("returns correct values", () => {
const zero = Decimal.fromUserInput("0", 5);
expect(Decimal.fromUserInput("0", 5).minus(zero).toString()).toEqual("0");
expect(Decimal.fromUserInput("1", 5).minus(zero).toString()).toEqual("1");
expect(Decimal.fromUserInput("2", 5).minus(zero).toString()).toEqual("2");
expect(Decimal.fromUserInput("2.8", 5).minus(zero).toString()).toEqual("2.8");
expect(Decimal.fromUserInput("0.12345", 5).minus(zero).toString()).toEqual("0.12345");
const one = Decimal.fromUserInput("1", 5);
expect(Decimal.fromUserInput("1", 5).minus(one).toString()).toEqual("0");
expect(Decimal.fromUserInput("2", 5).minus(one).toString()).toEqual("1");
expect(Decimal.fromUserInput("3", 5).minus(one).toString()).toEqual("2");
expect(Decimal.fromUserInput("3.8", 5).minus(one).toString()).toEqual("2.8");
expect(Decimal.fromUserInput("1.12345", 5).minus(one).toString()).toEqual("0.12345");
const oneDotFive = Decimal.fromUserInput("1.5", 5);
expect(Decimal.fromUserInput("1.5", 5).minus(oneDotFive).toString()).toEqual("0");
expect(Decimal.fromUserInput("2.5", 5).minus(oneDotFive).toString()).toEqual("1");
expect(Decimal.fromUserInput("3.5", 5).minus(oneDotFive).toString()).toEqual("2");
expect(Decimal.fromUserInput("4.3", 5).minus(oneDotFive).toString()).toEqual("2.8");
expect(Decimal.fromUserInput("1.62345", 5).minus(oneDotFive).toString()).toEqual("0.12345");
// original value remain unchanged
expect(zero.toString()).toEqual("0");
expect(one.toString()).toEqual("1");
expect(oneDotFive.toString()).toEqual("1.5");
});
it("throws for different fractional digits", () => {
const zero = Decimal.fromUserInput("0", 5);
expect(() => Decimal.fromUserInput("1", 1).minus(zero)).toThrowError(/do not match/i);
expect(() => Decimal.fromUserInput("1", 2).minus(zero)).toThrowError(/do not match/i);
expect(() => Decimal.fromUserInput("1", 3).minus(zero)).toThrowError(/do not match/i);
expect(() => Decimal.fromUserInput("1", 4).minus(zero)).toThrowError(/do not match/i);
expect(() => Decimal.fromUserInput("1", 6).minus(zero)).toThrowError(/do not match/i);
expect(() => Decimal.fromUserInput("1", 7).minus(zero)).toThrowError(/do not match/i);
});
it("throws for negative results", () => {
const one = Decimal.fromUserInput("1", 5);
expect(() => Decimal.fromUserInput("0", 5).minus(one)).toThrowError(/must not be negative/i);
expect(() => Decimal.fromUserInput("0.5", 5).minus(one)).toThrowError(/must not be negative/i);
expect(() => Decimal.fromUserInput("0.98765", 5).minus(one)).toThrowError(/must not be negative/i);
});
});
describe("equals", () => {
it("returns correct values", () => {
const zero = Decimal.fromUserInput("0", 5);