Adds backend module, tests for /version and /conversations (not real tests yet)

backend/src/androidTest/java/net/buzzert/kordophone/backend/ExampleInstrumentedTest.kt

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+package net.buzzert.kordophone.backend
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("net.buzzert.kordophone.backend.test", appContext.packageName)
+    }
+}

backend/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+<uses-permission android:name="android.permission.INTERNET" />
+</manifest>

backend/src/main/java/net/buzzert/kordophone/backend/APIClient.kt

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+package net.buzzert.kordophone.backend
+
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
+import java.net.URL
+
+class APIClient(baseURL: URL) {
+    private val retrofit: Retrofit = Retrofit.Builder()
+        .baseUrl(baseURL)
+        .addConverterFactory(GsonConverterFactory.create())
+        .build()
+
+    fun getClient(): Retrofit {
+        return retrofit
+    }
+}

backend/src/main/java/net/buzzert/kordophone/backend/APIInterface.kt

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+package net.buzzert.kordophone.backend
+
+import net.buzzert.kordophone.backend.model.Conversation
+import okhttp3.ResponseBody
+import retrofit2.Call
+import retrofit2.Response
+import retrofit2.http.GET
+
+interface APIInterface {
+    @GET("/version")
+    suspend fun getVersion(): ResponseBody
+
+    @GET("/conversations")
+    suspend fun getConversations(): Response<List<Conversation>>
+}

backend/src/main/java/net/buzzert/kordophone/backend/ChatRepository.kt

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+package net.buzzert.kordophone.backend
+
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.launch
+import net.buzzert.kordophone.backend.model.Conversation
+import java.net.URL
+
+class ChatRepository(baseURL: URL) {
+    private val client: APIClient = APIClient(baseURL)
+    private val apiInterface: APIInterface = client.getClient().create(APIInterface::class.java)
+
+    suspend fun getVersion(): String {
+        return apiInterface.getVersion().string()
+    }
+
+    suspend fun fetchConversations(): List<Conversation> {
+        return apiInterface.getConversations().body()!!
+    }
+}

backend/src/main/java/net/buzzert/kordophone/backend/model/Conversation.kt

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+package net.buzzert.kordophone.backend.model
+
+import com.google.gson.annotations.SerializedName
+import java.util.Date
+
+data class Conversation(
+    @SerializedName("date")
+    val date: Date,
+
+    @SerializedName("participantDisplayNames")
+    val participants: List<String>?,
+
+    @SerializedName("displayName")
+    val displayName: String?,
+
+    @SerializedName("unreadCount")
+    val unreadCount: Int,
+
+    @SerializedName("lastMessagePreview")
+    val lastMessagePreview: String,
+
+    @SerializedName("guid")
+    val guid: String,
+)

backend/src/test/java/net/buzzert/kordophone/backend/ExampleUnitTest.kt

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+package net.buzzert.kordophone.backend
+
+import kotlinx.coroutines.runBlocking
+import org.junit.Test
+
+import org.junit.Assert.*
+import java.net.URL
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    val repository = ChatRepository(URL("http://localhost:5738"))
+
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+
+    @Test
+    fun testGetVersion() = runBlocking {
+        val version = repository.getVersion()
+        println("Version: $version")
+    }
+
+    @Test
+    fun testFetchConversations() = runBlocking {
+        val conversations = repository.fetchConversations()
+        println("Conversations: $conversations")
+    }
+}