javatests/dagger/functional/kotlinsrc/factory/SubcomponentFactoryTest.kt

/*
 * Copyright (C) 2022 The Dagger Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package dagger.functional.kotlinsrc.factory

import com.google.common.truth.Truth.assertThat
import dagger.BindsInstance
import dagger.Component
import dagger.Module
import dagger.Provides
import dagger.Subcomponent
import javax.inject.Inject
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.JUnit4

/**
 * Tests for [subcomponent factories][Subcomponent.Factory].
 *
 * Most things are tested in `FactoryTest`; this is just intended to test some things like injecting
 * subcomponent factories and returning them from component methods.
 */
@RunWith(JUnit4::class)
class SubcomponentFactoryTest {
  @Component
  internal interface ParentWithSubcomponentFactory {
    fun subcomponentFactory(): Sub.Factory

    @Component.Factory
    interface Factory {
      fun create(@BindsInstance i: Int): ParentWithSubcomponentFactory
    }
  }

  @Subcomponent
  internal interface Sub {
    fun i(): Int
    fun s(): String

    @Subcomponent.Factory
    interface Factory {
      fun create(@BindsInstance s: String): Sub
    }
  }

  @Test
  fun parentComponentWithSubcomponentFactoryEntryPoint() {
    val parent = DaggerSubcomponentFactoryTest_ParentWithSubcomponentFactory.factory().create(3)
    val subcomponent = parent.subcomponentFactory().create("foo")
    assertThat(subcomponent.i()).isEqualTo(3)
    assertThat(subcomponent.s()).isEqualTo("foo")
  }

  @Module(subcomponents = [Sub::class])
  internal object ModuleWithSubcomponent {
    @Provides fun provideInt(): Int = 42
  }

  internal class UsesSubcomponentFactory @Inject constructor(private val subFactory: Sub.Factory) {
    fun getSubcomponent(s: String): Sub {
      return subFactory.create(s)
    }
  }

  @Component(modules = [ModuleWithSubcomponent::class])
  internal interface ParentWithModuleWithSubcomponent {
    fun usesSubcomponentFactory(): UsesSubcomponentFactory
  }

  @Test
  fun parentComponentWithModuleWithSubcomponent() {
    val parent = DaggerSubcomponentFactoryTest_ParentWithModuleWithSubcomponent.create()
    val usesSubcomponentFactory = parent.usesSubcomponentFactory()
    val subcomponent1 = usesSubcomponentFactory.getSubcomponent("foo")
    assertThat(subcomponent1.i()).isEqualTo(42)
    assertThat(subcomponent1.s()).isEqualTo("foo")
    val subcomponent2 = usesSubcomponentFactory.getSubcomponent("bar")
    assertThat(subcomponent2.i()).isEqualTo(42)
    assertThat(subcomponent2.s()).isEqualTo("bar")
  }
}