Improve unit tests

Author: LukasLechnerDev

app/src/test/java/com/lukaslechner/coroutineusecasesonandroid/usecases/coroutines/usecase1/PerformSingleNetworkRequestViewModelTest.kt

@@ -20,8 +20,7 @@ class PerformSingleNetworkRequestViewModelTest {
     @get: Rule
     val coroutineTestRule: CoroutineTestRule = CoroutineTestRule()
 
-    private val receivedUiStates: MutableList<UiState> =
-        arrayListOf()
+    private val receivedUiStates = mutableListOf<UiState>()
 
     @Test
     fun `should return Success when network request is successful`() =

app/src/test/java/com/lukaslechner/coroutineusecasesonandroid/usecases/coroutines/usecase10/CalculationInBackgroundViewModelTest.kt

@@ -16,8 +16,7 @@ class CalculationInBackgroundViewModelTest {
     @get: Rule
     val coroutineTestRule: CoroutineTestRule = CoroutineTestRule()
 
-    private val receivedUiStates: MutableList<UiState> =
-        arrayListOf()
+    private val receivedUiStates = mutableListOf<UiState>()
 
     @Test
     fun `performCalculation() should perform correct calculations`() =

app/src/test/java/com/lukaslechner/coroutineusecasesonandroid/usecases/coroutines/usecase2/Perform2SequentialNetworkRequestsViewModelTest.kt

@@ -19,8 +19,7 @@ class Perform2SequentialNetworkRequestsViewModelTest {
     @get: Rule
     val coroutineTestRule: CoroutineTestRule = CoroutineTestRule()
 
-    private val receivedUiStates: MutableList<UiState> =
-        arrayListOf()
+    private val receivedUiStates = mutableListOf<UiState>()
 
     @Test
     fun `should return Success when both network requests are successful`() =

app/src/test/java/com/lukaslechner/coroutineusecasesonandroid/usecases/coroutines/usecase3/PerformNetworkRequestsConcurrentlyViewModelTest.kt

@@ -21,8 +21,7 @@ class PerformNetworkRequestsConcurrentlyViewModelTest {
     @get: Rule
     val coroutineTestRule: CoroutineTestRule = CoroutineTestRule()
 
-    private val receivedUiStates: MutableList<UiState> =
-        arrayListOf()
+    private val receivedUiStates = mutableListOf<UiState>()
 
     @Test
     fun `performNetworkRequestsSequentially should return data after 3 times the response delay`() =

app/src/test/java/com/lukaslechner/coroutineusecasesonandroid/usecases/coroutines/usecase4/VariableAmountOfNetworkRequestsViewModelTest.kt

@@ -21,8 +21,7 @@ class VariableAmountOfNetworkRequestsViewModelTest {
     @get: Rule
     val coroutineTestRule: CoroutineTestRule = CoroutineTestRule()
 
-    private val receivedUiStates: MutableList<UiState> =
-        arrayListOf()
+    private val receivedUiStates = mutableListOf<UiState>()
 
     @Test
     fun `performNetworkRequestsSequentially() should return Success UiState on successful network requests after 4000ms`() =

app/src/test/java/com/lukaslechner/coroutineusecasesonandroid/usecases/coroutines/usecase5/NetworkRequestWithTimeoutViewModelTest.kt

@@ -19,8 +19,7 @@ class NetworkRequestWithTimeoutViewModelTest {
     @get: Rule
     val coroutineTestRule: CoroutineTestRule = CoroutineTestRule()
 
-    private val receivedUiStates: MutableList<UiState> =
-        arrayListOf()
+    private val receivedUiStates = mutableListOf<UiState>()
 
     @Test
     fun `performNetworkRequest() should return Success UiState on successful network request within timeout`() =

app/src/test/java/com/lukaslechner/coroutineusecasesonandroid/usecases/coroutines/usecase6/RetryNetworkRequestViewModelTest.kt

@@ -19,8 +19,7 @@ class RetryNetworkRequestViewModelTest {
     @get: Rule
     val coroutineTestRule: CoroutineTestRule = CoroutineTestRule()
 
-    private val receivedUiStates: MutableList<UiState> =
-        arrayListOf()
+    private val receivedUiStates = mutableListOf<UiState>()
 
     @Test
     fun `performSingleNetworkRequest() should return Success UiState on successful network response`() =