index.test.js

import arraySemanticJoin from './index.js';

const WRONG_ARG_OBJECT = {name: "John"};
const WRONG_ARG_STRING = "John";
const WRONG_ARG_NULL = null;
const WRONG_ARG_UNDEFINED = undefined;
const EMPTY_ARRAY = [];
const ONE_ITEM_ARRAY = ["John"];
const TWO_ITEMS_ARRAY = ["John", "Jane"];
const MORE_ITEMS_ARRAY = ["John", "Jane", "Paul", "Patrick"];

describe("Test function: arraySemanticJoin", () => {
    test("Wrong type of argument: Object", () => {
        expect(arraySemanticJoin(WRONG_ARG_OBJECT)).toBe('');
    });

    test("Wrong type of argument: String", () => {
        expect(arraySemanticJoin(WRONG_ARG_STRING)).toBe('');
    });

    test("Wrong type of argument: null", () => {
        expect(arraySemanticJoin(WRONG_ARG_NULL)).toBe('');
    });

    test("Wrong type of argument: undefined", () => {
        expect(arraySemanticJoin(WRONG_ARG_UNDEFINED)).toBe('');
    });

    test("Empty input array", () => {
        expect(arraySemanticJoin(EMPTY_ARRAY)).toBe('');
    });

    test("One item in input array", () => {
        expect(arraySemanticJoin(ONE_ITEM_ARRAY)).toBe('John');
    });

    test("Two items in input array", () => {
        expect(arraySemanticJoin(TWO_ITEMS_ARRAY)).toBe('John and\u00A0Jane');
    });

    test("More items in input array", () => {
        expect(arraySemanticJoin(MORE_ITEMS_ARRAY)).toBe('John, Jane, Paul and\u00A0Patrick');
    });
});

describe("Test function: arraySemanticJoin with own cunjuction string", () => {
    test("Empty array", () => {
        expect(arraySemanticJoin(EMPTY_ARRAY, {word: 'a'})).toBe('');
    });

    test("Empty array", () => {
        expect(arraySemanticJoin(EMPTY_ARRAY, {word: 'und'})).toBe('');
    });

    test("One item array", () => {
        expect(arraySemanticJoin(ONE_ITEM_ARRAY, {word: 'a'})).toBe('John');
    });

    test("One item array", () => {
        expect(arraySemanticJoin(ONE_ITEM_ARRAY, {word: 'und'})).toBe('John');
    });

    test("Two items array", () => {
        expect(arraySemanticJoin(TWO_ITEMS_ARRAY, {word: 'a'})).toBe('John a Jane');
    });

    test("Two items array", () => {
        expect(arraySemanticJoin(TWO_ITEMS_ARRAY, {word: 'und'})).toBe('John und Jane');
    });

    test("More items array", () => {
        expect(arraySemanticJoin(MORE_ITEMS_ARRAY, {word: 'a'})).toBe('John, Jane, Paul a Patrick');
    });

    test("More items array", () => {
        expect(arraySemanticJoin(MORE_ITEMS_ARRAY, {word: 'und'})).toBe('John, Jane, Paul und Patrick');
    });


    test("Wrong options parameter", () => {
        expect(arraySemanticJoin(MORE_ITEMS_ARRAY, {word: ['a']})).toBe('');
    });

    test("Wrong options parameter", () => {
        expect(arraySemanticJoin(MORE_ITEMS_ARRAY, {word: 1})).toBe('');
    });

    test("Wrong options parameter", () => {
        expect(arraySemanticJoin(MORE_ITEMS_ARRAY, {conjunction: 'und'})).toBe('');
    });
});