it('toss out non-numerics (NaN):', function() {
var input = [1, 2, NaN],
res = Lib.variance(input);
expect(res).toEqual(0.25);
});
it('return 2/3 on input [-1, 0, 1]:', function() {
var input = [-1, 0, 1],
res = Lib.variance(input);
expect(res).toEqual(2 / 3);
});
it('toss out non-numerics (strings):', function() {
var input = [1, 2, 'apple', 'orange'],
res = Lib.variance(input);
expect(res).toEqual(0.25);
});
it('return 0 on input [2, 2, 2, 2, 2]:', function() {
var input = [2, 2, 2, 2],
res = Lib.variance(input);
expect(res).toEqual(0);
});