Major code refactoring

Main goals are:
1. Ability to use mocks in unit tests instead of
having to setup mock web server as if it was an
integration test.
2. Cache Retrofit services in memory
3. Make it easier to read
4. Use OptIn where possible instead of propagating
Experimental* annotations everywhere

app/src/test/java/gq/kirmanak/mealient/ui/disclaimer/DisclaimerViewModelTest.kt

@@ -3,7 +3,8 @@ package gq.kirmanak.mealient.ui.disclaimer
 import com.google.common.truth.Truth.assertThat
 import dagger.hilt.android.testing.HiltAndroidTest
 import gq.kirmanak.mealient.data.disclaimer.DisclaimerStorage
-import gq.kirmanak.mealient.test.HiltRobolectricTest
+import io.mockk.MockKAnnotations
+import io.mockk.impl.annotations.MockK
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.take
 import kotlinx.coroutines.test.currentTime
@@ -11,18 +12,18 @@ import kotlinx.coroutines.test.runTest
 import org.junit.Before
 import org.junit.Test
 import java.util.concurrent.TimeUnit
-import javax.inject.Inject
 
-@ExperimentalCoroutinesApi
+@OptIn(ExperimentalCoroutinesApi::class)
 @HiltAndroidTest
-class DisclaimerViewModelTest : HiltRobolectricTest() {
-    @Inject
+class DisclaimerViewModelTest {
+    @MockK(relaxUnitFun = true)
     lateinit var storage: DisclaimerStorage
 
     lateinit var subject: DisclaimerViewModel
 
     @Before
     fun setUp() {
+        MockKAnnotations.init(this)
         subject = DisclaimerViewModel(storage)
     }