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LibJS: Test function toBeCloseTo takes an optional precision argument

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Modeled after the equivalent Jest function.
https://jestjs.io/docs/expect#tobeclosetonumber-numdigits
This commit is contained in:
Sam Kravitz 2023-08-02 18:22:54 -05:00 • committed by Andreas Kling
parent 73c8650ea0
commit c97eec030c
2 changed files with 17 additions and 3 deletions
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10
Userland/Libraries/LibJS/Tests/test-common-tests.js
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@ -36,6 +36,16 @@ test("toBeCloseTo", () => {
expect(1).not.toBeCloseTo(1.00001); expect(1).not.toBeCloseTo(1.00001);
expect(1).toBeCloseTo(1.000001); expect(1).toBeCloseTo(1.000001);
expect(1).not.toBeCloseTo(1.001, 3);
expect(1).toBeCloseTo(1.001, 2);
expect(1).not.toBeCloseTo(0, 0);
expect(6).toBeCloseTo(10, -1);
expect(125).toBeCloseTo(100, -2);
expect(3.14159).toBeCloseTo(3.14158, 4);
expect(() => {
expect(1).toBeCloseTo(1, "foo").toThrow(ExpectationError);
}).toThrow(ExpectationError);
[ [
["foo", 1], ["foo", 1],
[1, "foo"], [1, "foo"],

10
Userland/Libraries/LibJS/Tests/test-common.js
View file

@ -86,8 +86,7 @@ class ExpectationError extends Error {
}); });
} }
// FIXME: Take a precision argument like jest's toBeCloseTo matcher toBeCloseTo(value, precision = 5) {
toBeCloseTo(value) {
this.__expect( this.__expect(
typeof this.target === "number", typeof this.target === "number",
() => `toBeCloseTo: expected target of type number, got ${typeof this.target}` () => `toBeCloseTo: expected target of type number, got ${typeof this.target}`
@ -96,9 +95,14 @@ class ExpectationError extends Error {
typeof value === "number", typeof value === "number",
() => `toBeCloseTo: expected argument of type number, got ${typeof value}` () => `toBeCloseTo: expected argument of type number, got ${typeof value}`
); );
this.__expect(
typeof precision === "number",
() => `toBeCloseTo: expected precision of type number, got ${typeof precision}`
);
const epsilon = 10 ** -precision / 2;
this.__doMatcher(() => { this.__doMatcher(() => {
this.__expect(Math.abs(this.target - value) < 0.000001); this.__expect(Math.abs(this.target - value) < epsilon);
}); });
} }