js unit tests charlookup

describe('lookupChar',function(){

    it('with a non-string first parameter should return undefined',function(){
        expect(lookupChar(13,0)).to.equal(undefined,
            'The function did not return the correct result!');
    });

    it('with a non-number second parameter should return undefined',function(){
        expect(lookupChar('pesho','gosho')).to.equal(undefined,
            'The function did not return the correct result!');
    });


    it('with a floating point second parameter should return undefined',function(){
        expect(lookupChar('pesho',3.12)).to.equal(undefined,
            'The function did not return the correct result!');
    });


    it('with an incorrect index value should return incorrect index',function(){
        expect(lookupChar('gosho',13)).to.equal('Incorrect index',
            'The function did not return the correct result!');
    });

    it('with a negative index value should return incorrect index',function(){
        expect(lookupChar('stamat',-1)).to.equal('Incorrect index',
            'The function did not return the correct result!');
    });

    it('with an index value equal to string length should return Incorrect index',function(){
        expect(lookupChar('pesho',5)).to.equal('Incorrect index',
            'The function did not return the correct result!');
    });

    it('with correct parameters should return correct value',function(){
        expect(lookupChar('pesho',0)).to.equal('p',
            'The function did not return the correct result!');
    });

    it('with correct parameters should return correct value',function(){
        expect(lookupChar('stamat',3)).to.equal('m',
            'The function did not return the correct result!');
    });
});