Function testDragNode

test/jasmine/tests/sankey_test.js:1335–1360

(move)

                });

                function testDragNode(move) {
                    return function() {
                        var position;
                        var nodes;
                        var node;

                        return Promise.resolve()
                        .then(function() {
                            nodes = document.getElementsByClassName('sankey-node');
                            node = nodes.item(nodeId);
                            position = getNodeCoords(node);
                            var timeDelay = (arrangement === 'snap') ? 2000 : 0; // Wait for force simulation to finish
                            return drag({node: node, dpos: move, nsteps: 10, timeDelay: timeDelay});
                        })
                        .then(function() {
                            nodes = document.getElementsByClassName('sankey-node');
                            node = nodes.item(nodes.length - 1); // Dragged node is now the last one
                            var newPosition = getNodeCoords(node);
                            if(arrangement === 'freeform') {
                                expect(newPosition.x).toBeCloseTo(position.x + move[0], 0, 'final x position is off');
                            }
                            expect(newPosition.y).toBeCloseTo(position.y + move[1], 2, 'final y position is off');
                            return Promise.resolve(true);
                        });
                    };
                }

                it('should change the position of a node on drag', function(done) {
                    mockCopy.data[0].arrangement = arrangement;