sidePanel4.assertExpressionEquals("offsetWidth", 50);
sidePanel30Splitter.dragAndDrop(43, 0);
sidePanel1.assertExpressionEquals("offsetWidth", 50);
sidePanel2.assertExpressionEquals("offsetWidth", 30);
sidePanel3.assertExpressionEquals("offsetWidth", 7);
sidePanel4.assertExpressionEquals("offsetWidth", 50);
sidePanel30Splitter.dragAndDrop(43, 0);
sidePanel1.assertExpressionEquals("offsetWidth", 50);
sidePanel2.assertExpressionEquals("offsetWidth", 30);
sidePanel3.assertExpressionEquals("offsetWidth", 7);
sidePanel4.assertExpressionEquals("offsetWidth", 7);