Dev: add simple automated UI test setup (#1027)

## Description
This PR is mostly a proof-of-concept for setting up automated UI
testing. The tests use Roboelectric so they can run without an emulator.
There is also a sample instrumented test for running on emulators or
devices for future tests.

It adds two basic automated UI tests for adding a server. These are sort
integration tests because they use the actual implementations for the
view model and services like `ServerRepository` and `JellyfinServerDao`.

Also, moves the bulk of `MainActivity`'s compose code into a function
for future tests.

### Related issues
N/A

### Testing
Local testing

## Screenshots
N/A

## AI or LLM usage
None

app/src/androidTest/java/com/github/damontecres/wholphin/test/InstrumentedBasicUiTests.kt

@@ -0,0 +1,75 @@
+package com.github.damontecres.wholphin.test
+
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.test.ExperimentalTestApi
+import androidx.compose.ui.test.SemanticsNodeInteraction
+import androidx.compose.ui.test.junit4.createAndroidComposeRule
+import androidx.compose.ui.test.onNodeWithTag
+import androidx.compose.ui.test.onNodeWithText
+import androidx.compose.ui.test.performKeyInput
+import androidx.compose.ui.test.pressKey
+import com.github.damontecres.wholphin.MainContent
+import com.github.damontecres.wholphin.services.ScreensaverService
+import com.github.damontecres.wholphin.services.ScreensaverState
+import com.github.damontecres.wholphin.services.SetupDestination
+import com.github.damontecres.wholphin.ui.nav.Destination
+import com.github.damontecres.wholphin.ui.theme.WholphinTheme
+import dagger.hilt.android.testing.HiltAndroidRule
+import dagger.hilt.android.testing.HiltAndroidTest
+import io.mockk.every
+import io.mockk.mockk
+import kotlinx.coroutines.flow.MutableStateFlow
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+
+@HiltAndroidTest
+class InstrumentedBasicUiTests {
+    @get:Rule(order = 0)
+    var hiltRule = HiltAndroidRule(this)
+
+    @get:Rule(order = 1)
+    val composeTestRule = createAndroidComposeRule<TestActivity>()
+
+    lateinit var screensaverService: ScreensaverService
+
+    @Before
+    fun setup() {
+        screensaverService = mockk(relaxed = true)
+        every { screensaverService.state } returns MutableStateFlow(ScreensaverState(false, false, false, false))
+    }
+
+    @OptIn(ExperimentalTestApi::class)
+    @Test
+    fun myTest() {
+        // Start the app
+        composeTestRule.setContent {
+            WholphinTheme {
+                MainContent(
+                    backStack = mutableListOf(SetupDestination.ServerList),
+                    navigationManager = mockk(relaxed = true),
+                    appPreferences = mockk(relaxed = true),
+                    backdropService = mockk(relaxed = true),
+                    screensaverService = screensaverService,
+                    requestedDestination = Destination.Home(),
+                    modifier = Modifier,
+                )
+            }
+        }
+
+        composeTestRule.onNodeWithText("Add Server").assertExists()
+        composeTestRule.onNodeWithTag("add_server").performKeyInput {
+            pressKey(Key.DirectionDown) // TODO
+        }
+        composeTestRule.onNodeWithTag("add_server").performClickEnter()
+
+        composeTestRule.onNodeWithText("Discovered Servers").assertExists()
+    }
+}
+
+@OptIn(ExperimentalTestApi::class)
+fun SemanticsNodeInteraction.performClickEnter() =
+    performKeyInput {
+        pressKey(Key.DirectionCenter)
+    }

app/src/androidTest/java/com/github/damontecres/wholphin/test/TestActivity.kt

@@ -0,0 +1,7 @@
+package com.github.damontecres.wholphin.test
+
+import androidx.activity.ComponentActivity
+import dagger.hilt.android.AndroidEntryPoint
+
+@AndroidEntryPoint
+class TestActivity : ComponentActivity()

app/src/androidTest/java/com/github/damontecres/wholphin/test/WholphinTestRunner.kt

@@ -0,0 +1,14 @@
+package com.github.damontecres.wholphin.test
+
+import android.app.Application
+import android.content.Context
+import androidx.test.runner.AndroidJUnitRunner
+import dagger.hilt.android.testing.HiltTestApplication
+
+class WholphinTestRunner : AndroidJUnitRunner() {
+    override fun newApplication(
+        cl: ClassLoader?,
+        name: String?,
+        context: Context?,
+    ): Application = super.newApplication(cl, HiltTestApplication::class.java.name, context)
+}