BIT-5, BIT-101: Setup networking layer add get config call (#9)

Co-authored-by: joshua-livefront <joshua@livefront.com>

app/src/test/java/com/x8bit/bitwarden/example/ResultCallAdapterTests.kt

@@ -0,0 +1,51 @@
+package com.x8bit.bitwarden.example
+
+import com.x8bit.bitwarden.data.datasource.network.ResultCallAdapterFactory
+import kotlinx.coroutines.runBlocking
+import okhttp3.mockwebserver.MockResponse
+import okhttp3.mockwebserver.MockWebServer
+import org.junit.After
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+import retrofit2.Retrofit
+import retrofit2.create
+import retrofit2.http.GET
+
+class ResultCallAdapterTests {
+
+    private val server: MockWebServer = MockWebServer().apply { start() }
+    private val testService: FakeService =
+        Retrofit.Builder()
+            .baseUrl(server.url("/").toString())
+            // add the adapter being tested
+            .addCallAdapterFactory(ResultCallAdapterFactory())
+            .build()
+            .create()
+
+    @After
+    fun after() {
+        server.shutdown()
+    }
+
+    @Test
+    fun `when server returns error response code result should be failure`() = runBlocking {
+        server.enqueue(MockResponse().setResponseCode(500))
+        val result = testService.requestWithUnitData()
+        assertTrue(result.isFailure)
+    }
+
+    @Test
+    fun `when server returns successful response result should be success`() = runBlocking {
+        server.enqueue(MockResponse())
+        val result = testService.requestWithUnitData()
+        assertTrue(result.isSuccess)
+    }
+}
+
+/**
+ * Fake retrofit service used for testing call adapters.
+ */
+private interface FakeService {
+    @GET("/fake")
+    suspend fun requestWithUnitData(): Result<Unit>
+}