utils.test.ts

import * as utils from "./utils";

describe("Utils", () => {
    describe("exclusiveRange", () => {
        it("Should return an empty range if start & end are the same number", () => {
            expect(utils.exclusiveRange(1, 1)).toEqual([]);
            expect(utils.exclusiveRange(-1, -1)).toEqual([]);
        });
        it("Should return an empty range if Math.abs(start - end) <= 1 (because it\"s inclusive)", () => {
            expect(utils.exclusiveRange(-1, 0)).toEqual([]);
            expect(utils.exclusiveRange(-1000, -1001)).toEqual([]);
            expect(utils.exclusiveRange(-1000, -999)).toEqual([]);
            expect(utils.exclusiveRange(1, 2)).toEqual([]);
            expect(utils.exclusiveRange(0, 1)).toEqual([]);
            expect(utils.exclusiveRange(1000, 1001)).toEqual([]);
            expect(utils.exclusiveRange(1000, 999)).toEqual([]);
        });

        it("Should create decremental ranges", () => {
            expect(utils.exclusiveRange(10, 1)).toEqual([9, 8, 7, 6, 5, 4, 3, 2]);
            expect(utils.exclusiveRange(-1, -10)).toEqual([-2, -3, -4, -5, -6, -7, -8, -9]);
            expect(utils.exclusiveRange(3, -4)).toEqual([2, 1, 0, -1, -2, -3]);
        }); 
        it("Should create incremental ranges", () => {
            expect(utils.exclusiveRange(1, 10)).toEqual([2, 3, 4, 5, 6, 7, 8, 9]);
            expect(utils.exclusiveRange(-3, 5)).toEqual([-2, -1, 0, 1, 2, 3, 4]);
        });
    });

    describe("getPointsInTheMiddle", () => {
        it("Horizontal: Should get points in the middle if start & end are in the same row", () => {
            expect(utils.getPointsInTheMiddle(1, 9, 10)).toEqual([2, 3, 4, 5, 6, 7, 8]);
            expect(utils.getPointsInTheMiddle(5, 3, 3)).toEqual([4]);
            expect(utils.getPointsInTheMiddle(3, 4, 3)).toEqual([]);
            expect(utils.getPointsInTheMiddle(15, 16, 10)).toEqual([]);
            expect(utils.getPointsInTheMiddle(9, 6, 5)).toEqual([8, 7]);
        });

        it("Horizontal: Should return an empty array if start & end are NOT in the same row", () => {
            expect(utils.getPointsInTheMiddle(2, 3, 3)).toEqual([]);
            expect(utils.getPointsInTheMiddle(2, 5, 3)).toEqual([]);
            expect(utils.getPointsInTheMiddle(25, 33, 10)).toEqual([]);
        });

        it("Vertical: Should get points in the middle if start & end are in the same column", () => {
            expect(utils.getPointsInTheMiddle(5, 35, 10)).toEqual([15, 25]);
            expect(utils.getPointsInTheMiddle(7, 1, 3)).toEqual([4]);
            expect(utils.getPointsInTheMiddle(2, 5, 3)).toEqual([]);
            expect(utils.getPointsInTheMiddle(15, 16, 10)).toEqual([]);
            expect(utils.getPointsInTheMiddle(24, 4, 5)).toEqual([19, 14, 9]);
        });

        it("Vertical: Should return an empty array if start & end are NOT in the same column", () => {
            expect(utils.getPointsInTheMiddle(1, 8, 3)).toEqual([]);
            expect(utils.getPointsInTheMiddle(7, 0, 3)).toEqual([]);
            expect(utils.getPointsInTheMiddle(25, 33, 10)).toEqual([]);
        });

        it("Diagonal: Should get points in the middle for diagonally connected points", () => {
            expect(utils.getPointsInTheMiddle(0, 44, 10)).toEqual([11, 22, 33]);
            expect(utils.getPointsInTheMiddle(8, 0, 3)).toEqual([4]);
            expect(utils.getPointsInTheMiddle(0, 4, 3)).toEqual([]);
            expect(utils.getPointsInTheMiddle(44, 55, 10)).toEqual([]);
            expect(utils.getPointsInTheMiddle(24, 0, 5)).toEqual([18, 12, 6]);
            expect(utils.getPointsInTheMiddle(44, 58, 8)).toEqual([51]);
            expect(utils.getPointsInTheMiddle(56, 35, 8)).toEqual([49, 42]);
            expect(utils.getPointsInTheMiddle(32, 59, 8)).toEqual([41, 50]);
        });
    });
});