get ExtJS grid selected data, and use JUnit assertion to verify the result

getGridSelectedData.java

String gridQuery = "viewport #grid1";
String js = "return Ext.ComponentQuery.query('" + gridQuery
  			+ "')[0].getSelectionModel().getSelection()[0].data";
@SuppressWarnings(value="unchecked")
Map<String, Object> row = (Map<String, Object>)((JavascriptExecutor) _driver).executeScript(js);
assertThat("Project name", row.get("ProjectName").toString(), equalTo("Expected Project Name"));