Instantiate Dependency Injection Class using Kotlin in Unit Tests

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I’m trying to find a solution for how I can instantiate a class that uses dependency injection into unit testing using Kotlin and Junit.

I have a class that uses addiction injection:

class MinhaClasse @Inject constructor(val meuService: IMeuService, val outroService: IOutroService, val minhaFactory: IMinhaFactory): IMinhaClasse {
    ...
}

Where in my primary constructor I am injecting the interfaces where I will need.

I have my test file for this class:

class MeuServiceTest {
    private val meuService = mock(meuService::class.java)

    @Test
    fun meuMetodoTest() {
        val expectedResult = ...
        ...
        val result = runBlocking { meuService.meuMetodo(parametroDoMetodo) }
        assertEquals(expectedResult, result)
    }
}

I’m using runBlocking for this method is asynchronous.

As you can see I’m trying to mock my class but its return is null, I am using the Mockito library together with Junit for Kotlin described below:

    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-api</artifactId>
        <version>5.6.0-M1</version>
    </dependency>
    <dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-core</artifactId>
        <version>3.2.0</version>
        <scope>test</scope>
    </dependency>

The version of my Kotlin is 1.3.41 .

kotlin unit-testing junit mockito

1 answer

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After talking to more experienced devs I ended up adopting another library called Mockk that is able to mock interfaces and classes more easily!

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