Examine ExtJS Store Data (Selenium Web Driver + JUnit + ExtJS)

Part of the goal of unit test is to check result against expected values using various assertions. An essential data structure in ExtJS web application is store. So, no test case is complete without some assertion against the stores. For example, we might want to verify number of records, or value of certain column, ... Here are some code samples to access store data, get number of rows, or retrieve value of a column:

	//this example assuming storeID is known
	ArrayList<Object> storeData = (ArrayList<Object>) ((JavascriptExecutor) driver)
	.executeScript("return _.pluck(Ext.StoreManager.get(storeID).getRange(), 'data');", storeID);
	//get number of rows in the store's data
	int numberOfRows = storeData.size();
	//get the first row, you are going to see a JSON string on Java console
	System.out.println(storeData.get(0));
	//get the first row's value for the column "name"
	String name = ((Map<String, Object>) storeData.get(0)).get("name").toString();

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