Prepare code to record first lesson

Author: LukasLechnerREWE

.idea/codeStyles/Project.xml

@@ -1,13 +1,25 @@
 package com.lukaslechner.coroutineusecasesonandroid.usecases.coroutines.usecase1
 
+import androidx.lifecycle.viewModelScope
 import com.lukaslechner.coroutineusecasesonandroid.base.BaseViewModel
 import com.lukaslechner.coroutineusecasesonandroid.mock.MockApi
+import kotlinx.coroutines.launch
+import timber.log.Timber
 
 class PerformSingleNetworkRequestViewModel(
     private val mockApi: MockApi = mockApi()
 ) : BaseViewModel<UiState>() {
 
     fun performSingleNetworkRequest() {
-
+        uiState.value = UiState.Loading
+        viewModelScope.launch {
+            try {
+                val recentAndroidVersions = mockApi.getRecentAndroidVersions()
+                uiState.value = UiState.Success(recentAndroidVersions)
+            } catch (exception: Exception) {
+                Timber.e(exception)
+                uiState.value = UiState.Error("Network Request failed!")
+            }
+        }
     }
 }

app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/usecases/coroutines/usecase1/PerformSingleNetworkRequestViewModel.kt

@@ -0,0 +1,18 @@
+package com.lukaslechner.coroutineusecasesonandroid.usecases.coroutines.usecase1
+
+import com.lukaslechner.coroutineusecasesonandroid.mock.AndroidVersion
+import com.lukaslechner.coroutineusecasesonandroid.mock.MockApi
+import com.lukaslechner.coroutineusecasesonandroid.mock.VersionFeatures
+import com.lukaslechner.coroutineusecasesonandroid.mock.mockAndroidVersions
+import com.lukaslechner.coroutineusecasesonandroid.utils.EndpointShouldNotBeCalledException
+
+class FakeSuccessApi() : MockApi {
+
+    override suspend fun getRecentAndroidVersions(): List<AndroidVersion> {
+        return mockAndroidVersions
+    }
+
+    override suspend fun getAndroidVersionFeatures(apiLevel: Int): VersionFeatures {
+        throw EndpointShouldNotBeCalledException()
+    }
+}

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

@@ -0,0 +1,49 @@
+package com.lukaslechner.coroutineusecasesonandroid.usecases.coroutines.usecase1
+
+import androidx.arch.core.executor.testing.InstantTaskExecutorRule
+import com.lukaslechner.coroutineusecasesonandroid.mock.mockAndroidVersions
+import org.junit.After
+import org.junit.Assert
+import org.junit.Assert.*
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.TestRule
+
+class PerformSingleNetworkRequestViewModelTest {
+
+    @get: Rule
+    val testInstantTaskExecutorRule: TestRule = InstantTaskExecutorRule()
+
+    private val receivedUiStates = mutableListOf<UiState>()
+
+    @Test
+    fun `should return Success when network request is successful`() {
+
+        // Arrange
+        val fakeApi = FakeSuccessApi()
+        val viewModel = PerformSingleNetworkRequestViewModel(fakeApi)
+
+        observeViewModel(viewModel)
+
+        // Act
+        viewModel.performSingleNetworkRequest()
+
+        // Assert
+        Assert.assertEquals(
+            listOf(
+                UiState.Loading,
+                UiState.Success(mockAndroidVersions)
+            ), receivedUiStates
+        )
+    }
+
+    private fun observeViewModel(viewModel: PerformSingleNetworkRequestViewModel) {
+        viewModel.uiState().observeForever { uiState ->
+            if (uiState != null) {
+                receivedUiStates.add(uiState)
+            }
+        }
+    }
+
+}

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

@@ -0,0 +1,3 @@
+package com.lukaslechner.coroutineusecasesonandroid.utils
+
+class EndpointShouldNotBeCalledException : Throwable()