Injecting mock @Service for Spring unit tests

19
votes

I am testing a class that uses use @Autowired to inject a service:

public class RuleIdValidator implements ConstraintValidator<ValidRuleId, String> {

    @Autowired
    private RuleStore ruleStore;

    // Some other methods
}

But how can I mock ruleStore during testing? I can't figure out how to inject my mock RuleStore into Spring and into the Auto-wiring system.

Thanks

3
javaunit-testingspringspring-mvcmockito

3 Answers

18
votes

It is quite easy with Mockito:

@RunWith(MockitoJUnitRunner.class)
public class RuleIdValidatorTest {
    @Mock
    private RuleStore ruleStoreMock;

    @InjectMocks
    private RuleIdValidator ruleIdValidator;

    @Test
    public void someTest() {
        when(ruleStoreMock.doSomething("arg")).thenReturn("result");

        String actual = ruleIdValidator.doSomeThatDelegatesToRuleStore();

        assertEquals("result", actual);
    }
}

Read more about @InjectMocks in the Mockito javadoc or in a blog post that I wrote about the topic some time ago.

Available as of Mockito 1.8.3, enhanced in 1.9.0.

10
votes

You can use something like Mockito to mock the rulestore returned during testing. This Stackoverflow post has a good example of doing this:

spring 3 autowiring and junit testing

2
votes

You can do following:

package com.mycompany;    

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.DependsOn;
import org.springframework.stereotype.Component;

@Component
@DependsOn("ruleStore")
public class RuleIdValidator implements ConstraintValidator<ValidRuleId, String> {

    @Autowired
    private RuleStore ruleStore;

    // Some other methods
}

And your Spring Context should looks like:

<context:component-scan base-package="com.mycompany" />

<bean id="ruleStore" class="org.easymock.EasyMock" factory-method="createMock">
    <constructor-arg index="0" value="com.mycompany.RuleStore"/>
</bean>