tests: move scope to constructor for testability

Author: superus8r

app/src/androidTest/java/org/kabiri/android/usbterminal/domain/GetCustomBaudRateUseCaseAndroidTest.kt

@@ -1,7 +1,6 @@
 package org.kabiri.android.usbterminal.domain
 
 import com.google.common.truth.Truth.assertThat
-import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.test.runTest
 import org.junit.Test

app/src/androidTest/java/org/kabiri/android/usbterminal/domain/SetCustomBaudRateUseCaseAndroidTest.kt

@@ -1,10 +1,13 @@
 package org.kabiri.android.usbterminal.domain
 
 import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.advanceUntilIdle
 import kotlinx.coroutines.test.runTest
 import org.junit.Test
 import org.kabiri.android.usbterminal.common.getFakeUserSettingRepository
 
+@OptIn(ExperimentalCoroutinesApi::class)
 internal class SetCustomBaudRateUseCaseAndroidTest {
 
     @Test
@@ -16,11 +19,13 @@ internal class SetCustomBaudRateUseCaseAndroidTest {
             isCalledSetBaudRate = true
         })
         val sut = SetCustomBaudRateUseCase(
-            userSettingRepository = fakeUserSettingRepository
+            userSettingRepository = fakeUserSettingRepository,
+            scope = this,
         )
 
         // act
-        sut(123)
+        sut.invoke(123)
+        advanceUntilIdle()
 
         // assert
         assertThat(isCalledSetBaudRate).isTrue()

app/src/main/java/org/kabiri/android/usbterminal/domain/SetCustomBaudRateUseCase.kt

@@ -13,9 +13,9 @@ internal fun interface ISetCustomBaudRateUseCase {
 internal class SetCustomBaudRateUseCase
 @Inject constructor(
     private val userSettingRepository: IUserSettingRepository,
+    private val scope: CoroutineScope = CoroutineScope(Dispatchers.IO)
 ): ISetCustomBaudRateUseCase {
 
-    private val scope = CoroutineScope(Dispatchers.IO)
     override fun invoke(baudRate: Int) {
         scope.launch {
             userSettingRepository.setBaudRate(baudRate)