improve test

Author: VysotskiVadim

services-directions-models/src/test/java/com/mapbox/api/directions/v5/models/DirectionsResponseTest.java

@@ -1,5 +1,6 @@
 package com.mapbox.api.directions.v5.models;
 
+import androidx.annotation.NonNull;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonElement;
@@ -11,6 +12,7 @@
 
 import java.io.IOException;
 import java.nio.ByteBuffer;
+import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 import java.util.Collections;
@@ -87,13 +89,21 @@ public void fromJson_correctlyBuildsFromJson() throws Exception {
 
   @Test
   public void deserialization_from_byte_buffer() throws Exception {
-    byte[] json = loadJsonFixture(DIRECTIONS_V5_PRECISION6_FIXTURE).getBytes(StandardCharsets.UTF_8);
+    String textJson = loadJsonFixture(DIRECTIONS_V5_PRECISION6_FIXTURE);
+    ByteBuffer buffer = putTextToDirectByteBuffer(textJson, StandardCharsets.UTF_8);
+
+    DirectionsResponse responseFromBuffer = DirectionsResponse.fromJson(buffer, StandardCharsets.UTF_8);
+    DirectionsResponse responseFromText = DirectionsResponse.fromJson(textJson);
+
+    assertEquals(responseFromText, responseFromBuffer);
+  }
+
+  @NonNull private ByteBuffer putTextToDirectByteBuffer(String textJson, Charset charset) {
+    byte[] json = textJson.getBytes(charset);
     ByteBuffer buffer = ByteBuffer.allocateDirect(json.length);
     buffer.put(json);
     buffer.position(0);
-    DirectionsResponse response = DirectionsResponse.fromJson(buffer, StandardCharsets.UTF_8);
-    assertNotNull(response);
-    assertEquals(1, response.routes().size());
+    return buffer;
   }
 
   @Test