Add test to verifying initial state when view binds

app/src/main/java/com/edwnmrtnz/trendingrepo/ui/MainPresenter.kt

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+package com.edwnmrtnz.trendingrepo.ui
+
+import com.edwnmrtnz.trendingrepo.StatefulPresenter
+
+class MainPresenter : StatefulPresenter<MainUiState, MainScreenView>() {
+
+    override fun initialState() = MainUiState(isLoading = true)
+}

app/src/main/java/com/edwnmrtnz/trendingrepo/ui/MainScreenView.kt

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+package com.edwnmrtnz.trendingrepo.ui
+
+import com.edwnmrtnz.trendingrepo.ScreenView
+
+interface MainScreenView : ScreenView<MainUiState>

app/src/main/java/com/edwnmrtnz/trendingrepo/ui/MainUiState.kt

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+package com.edwnmrtnz.trendingrepo.ui
+
+data class MainUiState(
+    val isLoading: Boolean = false
+)

app/src/test/java/com/edwnmrtnz/trendingrepo/ui/MainPresenterTest.kt

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+package com.edwnmrtnz.trendingrepo.ui
+
+import com.edwnmrtnz.trendingrepo.StatefulPresenter
+import com.edwnmrtnz.trendingrepo.TestView
+import com.github.amaterasu.localtest.CoroutineTestRule
+import com.google.common.truth.Truth
+import kotlinx.coroutines.runBlocking
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+
+class MainPresenterTest {
+
+    internal class FakeView : MainScreenView, TestView<MainUiState>()
+    private lateinit var presenter: MainPresenter
+    private lateinit var view: FakeView
+
+    @get:Rule
+    val coroutineTestRule = CoroutineTestRule()
+
+    @Before
+    fun setup() {
+        StatefulPresenter.setScope(coroutineTestRule.scope)
+        presenter = MainPresenter()
+        view = FakeView()
+    }
+
+    @Test
+    fun `initial state must be loading`() = runBlocking {
+        presenter.bind(view)
+
+        Truth.assertThat(view.first().isLoading).isTrue()
+    }
+}