android: unify api error mapping across data repositories

android/app/src/test/java/ru/daemonlord/messenger/data/common/ApiErrorMapperTest.kt

@@ -0,0 +1,43 @@
+package ru.daemonlord.messenger.data.common
+
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.ResponseBody.Companion.toResponseBody
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import retrofit2.HttpException
+import retrofit2.Response
+import ru.daemonlord.messenger.domain.common.AppError
+import java.io.IOException
+
+class ApiErrorMapperTest {
+
+    @Test
+    fun ioException_mapsToNetwork() {
+        val error = IOException("offline").toAppError()
+        assertTrue(error is AppError.Network)
+    }
+
+    @Test
+    fun loginMode_maps401ToInvalidCredentials() {
+        val error = httpException(401).toAppError(mode = ApiErrorMode.LOGIN)
+        assertTrue(error is AppError.InvalidCredentials)
+    }
+
+    @Test
+    fun defaultMode_maps401ToUnauthorized() {
+        val error = httpException(401).toAppError(mode = ApiErrorMode.DEFAULT)
+        assertTrue(error is AppError.Unauthorized)
+    }
+
+    @Test
+    fun defaultMode_maps500ToServer() {
+        val error = httpException(500).toAppError(mode = ApiErrorMode.DEFAULT)
+        assertTrue(error is AppError.Server)
+    }
+
+    private fun httpException(code: Int): HttpException {
+        val body = "{}".toResponseBody("application/json".toMediaType())
+        return HttpException(Response.error<Any>(code, body))
+    }
+}
+