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LifeofMichal merged 1 commit into from
Mar 19, 2026
Merged

quicksort tests for floating point #8

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150 changes: 101 additions & 49 deletions src/__tests__/quicksort/index.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -5,69 +5,121 @@ import { ascendingInvalidFirst } from "../../comparators/ascendingInvalidFirst";
import { descendingInvalidLast } from "../../comparators/descendingInvalidLast";

describe("quicksort", () => {
describe("short sort array of numbers in order of", () => {
it("ascending", () => {
const array = [5, 7.3, 7, 3.1, -20, 0, 40];
quicksort(array, 0, array.length - 1);
expect(array).toEqual([-20, 0, 3.1, 5, 7, 7.3, 40]);
});
describe("should sort array of numbers in order of", () => {
describe("ascending", () => {
it("by default", () => {
const array = [5, 7.3, 7, 3.1, -20, 0, 40];
quicksort(array, 0, array.length - 1);
expect(array).toEqual([-20, 0, 3.1, 5, 7, 7.3, 40]);
});

it("ascending with non-numeric values at the end", () => {
const array = [5, "MOO", 7.3, null, 7, 3.1, -20, 0, undefined, 40];
quicksort(array, 0, array.length - 1);
it("with floating point value", () => {
const array = [
0.1,
0.1 + 0.11,
0.3 - 0.1,
0.2,
0.3 + 0.1,
0.4 - 0.1,
0.3,
0.1 + 0.2,
];
quicksort(array, 0, array.length - 1);
expect(array).toEqual([
0.1, // 0.1
0.19999999999999998, // 0.3 - 0.1
0.2, // 0.2
0.21000000000000002, // 0.1 + 0.11
0.3, // 0.3
0.30000000000000004, // 0.1 + 0.2
0.30000000000000004, // 0.4 - 0.1
0.4, // 0.3 + 0.1
]);
});

const sortedValidNumericValues = array.slice(0, 7);
const lastInvalidValued = array.slice(7);
it("with non-numeric values at the end", () => {
const array = [5, "MOO", 7.3, null, 7, 3.1, -20, 0, undefined, 40];
quicksort(array, 0, array.length - 1);

expect(sortedValidNumericValues).toEqual([-20, 0, 3.1, 5, 7, 7.3, 40]);
expect(lastInvalidValued).toContain("MOO");
expect(lastInvalidValued).toContain(null);
expect(lastInvalidValued).toContain(undefined);
});
const sortedValidNumericValues = array.slice(0, 7);
const lastInvalidValued = array.slice(7);

it("ascending with non-numeric values at the start", () => {
const array = [5, "MOO", 7.3, null, 7, 3.1, -20, 0, undefined, 40];
quicksort(array, 0, array.length - 1, ascendingInvalidFirst);
expect(sortedValidNumericValues).toEqual([-20, 0, 3.1, 5, 7, 7.3, 40]);
expect(lastInvalidValued).toContain("MOO");
expect(lastInvalidValued).toContain(null);
expect(lastInvalidValued).toContain(undefined);
});

const firstInvalidValued = array.slice(0, 3);
const sortedValidNumericValues = array.slice(3);
it("with non-numeric values at the start", () => {
const array = [5, "MOO", 7.3, null, 7, 3.1, -20, 0, undefined, 40];
quicksort(array, 0, array.length - 1, ascendingInvalidFirst);

expect(firstInvalidValued).toContain("MOO");
expect(firstInvalidValued).toContain(null);
expect(firstInvalidValued).toContain(undefined);
expect(sortedValidNumericValues).toEqual([-20, 0, 3.1, 5, 7, 7.3, 40]);
});
const firstInvalidValued = array.slice(0, 3);
const sortedValidNumericValues = array.slice(3);

it("descending", () => {
const array = [5, 7.3, 7, 3.1, -20, 0, 40];
quicksort(array, 0, array.length - 1, descending);
expect(array).toEqual([40, 7.3, 7, 5, 3.1, 0, -20]);
expect(firstInvalidValued).toContain("MOO");
expect(firstInvalidValued).toContain(null);
expect(firstInvalidValued).toContain(undefined);
expect(sortedValidNumericValues).toEqual([-20, 0, 3.1, 5, 7, 7.3, 40]);
});
});

it("descending with non-numeric values at the start", () => {
const array = [5, "MOO", 7.3, null, 7, 3.1, -20, 0, undefined, 40];
quicksort(array, 0, array.length - 1, descending);
describe("descending", () => {
it("by default", () => {
const array = [5, 7.3, 7, 3.1, -20, 0, 40];
quicksort(array, 0, array.length - 1, descending);
expect(array).toEqual([40, 7.3, 7, 5, 3.1, 0, -20]);
});

const firstInvalidValued = array.slice(0, 3);
const sortedValidNumericValues = array.slice(3);
it("with floating point value", () => {
const array = [
0.1,
0.1 + 0.11,
0.3 - 0.1,
0.2,
0.3 + 0.1,
0.4 - 0.1,
0.3,
0.1 + 0.2,
];
quicksort(array, 0, array.length - 1, descending);
expect(array).toEqual([
0.4, // 0.3 + 0.1
0.30000000000000004, // 0.4 - 0.1
0.30000000000000004, // 0.1 + 0.2
0.3, // 0.3
0.21000000000000002, // 0.1 + 0.11
0.2, // 0.2
0.19999999999999998, // 0.3 - 0.1
0.1, // 0.1
]);
});

expect(firstInvalidValued).toContain("MOO");
expect(firstInvalidValued).toContain(null);
expect(firstInvalidValued).toContain(undefined);
expect(sortedValidNumericValues).toEqual([40, 7.3, 7, 5, 3.1, 0, -20]);
});
it("with non-numeric values at the start", () => {
const array = [5, "MOO", 7.3, null, 7, 3.1, -20, 0, undefined, 40];
quicksort(array, 0, array.length - 1, descending);

const firstInvalidValued = array.slice(0, 3);
const sortedValidNumericValues = array.slice(3);

expect(firstInvalidValued).toContain("MOO");
expect(firstInvalidValued).toContain(null);
expect(firstInvalidValued).toContain(undefined);
expect(sortedValidNumericValues).toEqual([40, 7.3, 7, 5, 3.1, 0, -20]);
});

it("descending with non-numeric values at the end", () => {
const array = [5, "MOO", 7.3, null, 7, 3.1, -20, 0, undefined, 40];
quicksort(array, 0, array.length - 1, descendingInvalidLast);
it("with non-numeric values at the end", () => {
const array = [5, "MOO", 7.3, null, 7, 3.1, -20, 0, undefined, 40];
quicksort(array, 0, array.length - 1, descendingInvalidLast);

const sortedValidNumericValues = array.slice(0, 7);
const lastInvalidValued = array.slice(7);
const sortedValidNumericValues = array.slice(0, 7);
const lastInvalidValued = array.slice(7);

expect(sortedValidNumericValues).toEqual([40, 7.3, 7, 5, 3.1, 0, -20]);
expect(lastInvalidValued).toContain("MOO");
expect(lastInvalidValued).toContain(null);
expect(lastInvalidValued).toContain(undefined);
expect(sortedValidNumericValues).toEqual([40, 7.3, 7, 5, 3.1, 0, -20]);
expect(lastInvalidValued).toContain("MOO");
expect(lastInvalidValued).toContain(null);
expect(lastInvalidValued).toContain(undefined);
});
});
});
});
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