// local modules - jest

const runTest = require("../.jest/runTest");

// local files

const getRandomIndexInArray = require("../getRandomIndexInArray");

const testCases = [

{

describe: "should return an index",

it: "from exampleArray",

handler: () => {

const exampleArray = ["a", "b", "c", "d", "e"];

for (let i = 0; i < 100; i++) {

const index = getRandomIndexInArray(exampleArray);

expect(index).toBeGreaterThanOrEqual(0);

expect(index).toBeLessThan(exampleArray.length);

}

}

},

{

describe: "should return -1",

it: "if array is empty",

handler: () => {

const index = getRandomIndexInArray([]);

expect(index).toBe(-1);

}

},

{

describe: "should throw an exception",

it: "argument is not an array",

handler: () => {

expect(() => {

getRandomIndexInArray(0);

}).toThrow();

}

}

];

runTest({ testCases });

module.exports = {

testCases

};