gistfile1.js

    describe('Any live cell with fewer than two live neighbours dies, as if caused by under-population.', function () {
        it('should kill cell with no live neighbours', function () {
            game.setCell(3,3);
            game.nextFrame();
            expect(game.grid()[3][3]).toBe(0);
        });

        it('should kill cell with one live neighbour', function () {
            game.setCell(3,2);

            game.setCell(3,3);
            game.nextFrame();
            expect(game.grid()[3][3]).toBe(0);
        });

        it('should kill cell with one live neighbour in the previous row', function () {
            game.setCell(2,2);

            game.setCell(3,3);
            game.nextFrame();
            expect(game.grid()[3][3]).toBe(0);
        });

        it('should kill cell with one live neighbour in the next row', function () {
            game.setCell(4,4);

            game.setCell(3,3);
            game.nextFrame();
            expect(game.grid()[3][3]).toBe(0);
        });
    });