Avoid unnecessary @Component construction during spring unit test

Question

Assume two @Component's are defined, like this:

@Component
public class UnderTesting {
}

@Component
public class Irrelevant {
}

The unit test is like this:

@SpringBootTest
public Test_UnderTesting {
    @Autowired
    private UnderTesting foo;

    @Test
    public void testSomething() {
    }
}

When running this test case with mvn test, spring will construct component Irrelevant even though it's completely irrelevant.

In my case the component Irrelevant cannot be constructed due to unavailability of complex dependencies in the unit test environment.

My question is: how to avoid constructing Irrelevant (and other unnecessary components) during unit test ?

I'm kind new to spring boot, so I may have been heading a wrong direction, any suggestions are welcome.

dunni · Accepted Answer · 2021-01-13 11:24:19Z

3

One thing to understand is, as soon as you use @SpringBootTest, it's not a unit test anymore. The point of using that annotation is, that your application context starts as similar as possible to the production use.

You could define a separate configuration class for this test case specifically, where you only create a bean of the class UnderTesting, like this:

@SpringBootTest(classes = {TestConfiguration.class})

where in TestConfiguration.class you could create a bean factory method like this:

public UnderTesting underTesting() {
    return new UnderTesting();
}

but i would rather look if you can write this test as a real unit test (if that's what you want), without using any Spring Boot functionality, and mock any dependencies.

answered Jan 13, 2021 at 11:24

dunni

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Comments

burm87 · Accepted Answer · 2021-01-13 11:24:35Z

0

How about creating a test profile to use when you run your tests and annotate your Irrelevant class with @Profile("!test")?

answered Jan 13, 2021 at 11:24

burm87

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2 Comments

user416983 Over a year ago

This not gonna work, since Irrelevant has its own test cases.

burm87 Over a year ago

Then the only option is I think passing a custom configuration to your test as @dunni wrote

Guilherme Silva Sousa · Accepted Answer · 2022-12-24 07:17:52Z

0

The simplest way using mockito:

@SpringBootTest
public Test_UnderTesting {

    @MockBean
    private Irrelevant irrelevant; //Autowiring the unnecessary component as a mock

    @Autowired
    private UnderTesting foo;

    @Test
    public void testSomething() {
    }
}

Dependencies required:

answered Dec 24, 2022 at 7:17

Guilherme Silva Sousa

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Comments

Vamsi · Accepted Answer · 2021-01-13 11:23:54Z

-1

We can load the component lazily, i.e. by using @Lazy annotation on top of @Component

Please refer this link for more information: https://www.baeldung.com/spring-lazy-annotation

answered Jan 13, 2021 at 11:23

Vamsi

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Avoid unnecessary @Component construction during spring unit test

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The simplest way using mockito:

Dependencies required:

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The simplest way using mockito:

Dependencies required:

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