it('toss out non-numerics (NaN):', function() {
var input = [1, 2, NaN],
res = Lib.stdev(input);
expect(res).toEqual(0.5);
});
it('return sqrt(2/3) on input [-1, 0, 1]:', function() {
var input = [-1, 0, 1],
res = Lib.stdev(input);
expect(res).toEqual(Math.sqrt(2 / 3));
});
it('toss out non-numerics (strings):', function() {
var input = [1, 2, 'apple', 'orange'],
res = Lib.stdev(input);
expect(res).toEqual(0.5);
});
it('return 0 on input [2, 2, 2, 2, 2]:', function() {
var input = [2, 2, 2, 2],
res = Lib.stdev(input);
expect(res).toEqual(0);
});