How To Test Negative Paths in the Spring Framework?

Hi, I am going to test all the exceptions that can be thrown - provide some error input, if the exception thrown is what I expect, the JUnit test passes. And the project uses the Spring framework. I am not familiar with testing in the Spring framework; henceforth, I am writing to seek help.

Is it true that all I have to do is to write for the "numberFormatAsserter" class? How do I code it? Thank you.

import THE_JAVA_CLASS_I_WANT_TO_TEST;
import javax.annotation.Resource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.annotation.IfProfileValue;
import org.springframework.test.annotation.ProfileValueSourceConfiguration;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.TestExecutionListeners;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.support.DependencyInjectionTestExecutionListener;
import org.springframework.test.context.support.DirtiesContextTestExecutionListener;

@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration(locations = {
		"classpath:CLASSPATH_TO_THE_SPRING_CONFIGURATION_FILE",
                                 .......
})

@IfProfileValue(name = "test-groups", values =
	{ "group1", "group2", "all" })
@TestExecutionListeners(value = {
		DependencyInjectionTestExecutionListener.class,
		DirtiesContextTestExecutionListener.class })
public class Test_JAVA_CLASS {

private static final Log LOG = LogFactory.getLog(Test_JAVA_CLASS .class);

@Test
                @ExpectedException(NumberFormatException.class)
                public void testWrongNumberFormat() throws Exception {
                    this.TEST_METHOD_IN_THE_SPRING_CONFIGURATION_FILE.execute();
                }

THE_SPRING_CONFIGURATION_FILE.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:p="http://www.springframework.org/schema/p"
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd">

Spring has got an entire chapter dedicated to Testing in its documentation and its pretty easy to follow if you already know JUnit.

Also I don't follow you questions. Looks like you already have your test class ready - so exactly what are you looking for?

where do I find the chapter that is dedicated to Testing?

I am supposed to write unit tests for all kinds of data errors that developers can think of. If the error is what expected, it should pass the unit test. I simply would like to start with an example; say, the NumberFormatException. My question is how do I code it?

Thank you.

The testing chapter in the docs. Your test looks fine. Are you encountering a problem?

I think that I was not specific enough. In the Spring framework shown in the earlier posts, how do I let the "null" output to pass the JUnit test? For example, I did something below. But, the JUnit test gives me the java.lang.AssertionError: Expected exception: java.lang.NullPointerException. But the NullPointerException is what I expected. I want to let it pass. In the Java class that is being tested, I have:

In the Spring configuration file: