GWT Testing

by Online Tutorials Library July 14, 2022

GWT Testing

JUnit provides time-tested framework for testing GWT application. It consists of many tools which can directly create the test cases according to user needs.

Now, on the basis of web-project STOCK EXCHANGE(created in previous chapter) we perform JUnit testing.

Like all GWT JUnit test cases, the StockExchangeTest class extends the GWT Test Case class in the com.google.gwt.junit.client package. You can create additional test cases by extending this class.
The StockExchangeTest class has an abstract method (getModuleName) that must return the name of the GWT module. For StockExchange, that is com.google.gwt.sample.stockexchange.StockExchange.
The StockExchangeTest class is generated with one sample test case tautological test, testSimple. This testSimple method uses one of the many assert functions that it inherits from the JUnit Assert class.
The assertTrue(boolean) function asserts that the boolean argument passed in evaluates to true. If not, the testSimple test will fail when run in JUnit.

StockExchangeTest.java

 package com.google.gwt.sample.stockexchange.client;     import com.google.gwt.junit.client.GWTTestCase;     /**      * GWT JUnit tests must extend GWTTestCase.  */ public class StockExchangeTest extends GWTTestCase {                              /**        * Must refer to a valid module that sources this class.    */   public String getModuleName() {       return “com.google.gwt.sample.stockexchange.StockExchange”;   }       /**        * Add as many tests as you like.    */   public void testSimple() {                                               assertTrue(true);   }     } 

Running unit tests

You can run JUnit tests four ways:

from the command line, using the scripts generated by junitCreator
in Eclipse, using the Google Plugin for Eclipse
in Eclipse, using the Eclipse launch configuration files generated by webAppCreator
in manual test mode

We are using Eclipse and Google plug-in:

The Google Plugin for Eclipse makes it easy to run tests in Eclipse.

Run the JUnit test in development mode.
From Package Explorer, right click on the test case you want to run, select Run As > GWT Junit Test
The simpleTest executes without error.

GWT Testing 1

Run the JUnit test in production mode.
From Package Explorer, right click on the test case you want to run, select Run As > GWT Junit Test (production mode)
The simpleTest executes without error.

Writing unit test

Write a JUnit test to verify that the constructor of the StockPrice class is correctly setting the new object’s instance fields.
To the StockExchangeTest class, add the testStockPriceCtor method as shown below.

 /**      * Verify that the instance fields in the StockPrice class are set correctly.  */ public void testStockPriceCtor() {   String symbol = “XYZ”;   double price = 70.0;   double change = 2.0;   double changePercent = 100.0 * change / price;   StockPrice sp = new StockPrice(symbol, price, change);   assertNotNull(sp);   assertEquals(symbol, sp.getSymbol());   assertEquals(price, sp.getPrice(), 0.001);   assertEquals(change, sp.getChange(), 0.001);   assertEquals(changePercent, sp.getChangePercent(), 0.001); } 

Rerun StockExchangeTest in development mode.

Both tests should pass:

 [junit] Running com.google.gwt.sample.stockexchange.client.StockExchangeTest [junit] Tests run: 2, Failures: 0, Errors: 0, Time elapsed: 12.451 sec 

Next TopicGWT JSON

GWT Testing

GWT Testing

Running unit tests

Writing unit test

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