Edit in JSFiddle

describe('toContain', function() {
    it('passes if the expected item is an element in the actual array', function() {
        expect([1, 2, 3]).toContain(2);        
    });
    
    it('fails if an element in not in the array', function() {
        expect([1, 2, 3]).not.toContain(4);
    });
});

execJasmine();