Koin: NoBeanDefFoundException, 检查你的模块定义

Question

金币测试结果如下：

org.koin.core.error.NoBeanDefFoundException: No definition found for '<class_name>' has been found. Check your module definitions.

classEmailValidatorUtilImpl执行得很好，

import org.junit.After
import org.junit.Assert
import org.junit.Before
import org.junit.Test
import org.koin.core.context.startKoin
import org.koin.core.context.stopKoin
import org.koin.dsl.module
import org.koin.test.KoinTest
import org.koin.test.inject

class EmailValidatorUtilImpl : EmailValidatorUtil {

    private val pattern = Pattern.compile(EMAIL_PATTERN)
    private var matcher: Matcher? = null

    override fun validateEmail(email: String): Boolean {
        matcher = pattern.matcher(email)
        return matcher!!.matches()
    }

    companion object {
        private val EMAIL_PATTERN = "^[a-zA-Z0-9#_~!$&'()*+,;=:.\"(),:;<>@\[\]\\]+@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*$"
    }
}

同时，注入KoinTest如下：


class EmailValidatorUtilImplTest : KoinTest, KoinComponent {

    private val validatorUtilImpl: EmailValidatorUtilImpl by inject()

    @Before
    fun setUp() {
        startKoin { module { single { EmailValidatorUtilImpl } } }
    }

    @Test
    fun `is valid email returns true`() {
        val isEmailValid = validatorUtilImpl.validateEmail("someone@somewhere.com")
        Assert.assertTrue(isEmailValid)
    }

    @Test
    fun `is invalid email returns false`() {
        val isEmailValid = validatorUtilImpl.validateEmail("invalid_email")
        Assert.assertFalse(isEmailValid)
    }

    @After
    fun tearDown() {
        stopKoin()
    }
}

此外，实现 class 已被注入


var loginUtilsModule = module {
    single { EmailValidatorUtilImpl() }
}

在申请中class：

startKoin {
            androidLogger(Level.DEBUG)
            androidContext(this@SampleApplication)
            modules(listOf(
                    loginUtilsModule
            ))
        }

依赖项（app/build.gradle）：


    // di
    implementation 'org.koin:koin-androidx-viewmodel:2.0.1'
    implementation 'org.koin:koin-androidx-scope:2.0.1'
    implementation 'org.koin:koin-android:2.0.1'

    // test
    testImplementation 'org.mockito:mockito-core:2.28.2'
    testImplementation 'org.koin:koin-test:2.0.1'
    testImplementation 'junit:junit:4.12'

    // android test
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'org.koin:koin-test:2.0.1'

Answer 1

我发现了问题，错误是模块而不是 模块 (or.koin.core.KoinApplication)

    @Before
    fun setUp() {
        startKoin { module { single { EmailValidatorUtilImpl } } }
    }

所以，解决方案和正确的版本是：

    startKoin { modules(loginUtilsModule) }

Answer 2

我遇到了同样的问题，但就我而言，Koin 无法解析接口的实现。我有：

interface MessagesRepository {...}

class MessagesRepositoryImpl : MessagesRepository {...}

class GetMessagesUseCase(private val messagesRepository: MessagesRepository) {...}

我在 Koin 模块中写道：

single { MessagesRepositoryImpl() }
single { GetMessagesUseCase(get()) }

所以 Koin 找不到 MessagesRepository 的实例来将其注入 GetMessagesUseCase。指定单例类型明确解决了问题（但也许有更好的解决方案）：

single<MessagesRepository> { MessagesRepositoryImpl() }
single { GetMessagesUseCase(get()) }

Answer 3

 single { MessagesRepositoryImpl() as MessagesRepository }

Yamashiro Rion你可以做到

Koin: NoBeanDefFoundException, 检查你的模块定义

Koin: NoBeanDefFoundException, Check your module definitions

android

unit-testing

kotlin

dependency-injection

koin