Fix AssetDeserializer

src/main/java/org/stellar/sdk/responses/AssetDeserializer.java

@@ -15,7 +15,7 @@ class AssetDeserializer implements JsonDeserializer<Asset> {
   @Override
   public Asset deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
     String type = json.getAsJsonObject().get("asset_type").getAsString();
-    if (type == "native") {
+    if (type.equals("native")) {
       return new AssetTypeNative();
     } else {
       String code = json.getAsJsonObject().get("asset_code").getAsString();

src/test/java/org/stellar/sdk/responses/AssetDeserializerTest.java

@@ -0,0 +1,29 @@
+package org.stellar.sdk.responses;
+
+import junit.framework.TestCase;
+import org.junit.Test;
+import org.stellar.sdk.Asset;
+import org.stellar.sdk.AssetTypeCreditAlphaNum;
+
+public class AssetDeserializerTest extends TestCase {
+    @Test
+    public void testDeserializeNative() {
+        String json = "{\"asset_type\": \"native\"}";
+        Asset asset = GsonSingleton.getInstance().fromJson(json, Asset.class);
+        assertEquals(asset.getType(), "native");
+    }
+
+    @Test
+    public void testDeserializeCredit() {
+        String json = "{\n" +
+                "  \"asset_type\": \"credit_alphanum4\",\n" +
+                "  \"asset_code\": \"CNY\",\n" +
+                "  \"asset_issuer\": \"GAREELUB43IRHWEASCFBLKHURCGMHE5IF6XSE7EXDLACYHGRHM43RFOX\"\n" +
+                "}";
+        Asset asset = GsonSingleton.getInstance().fromJson(json, Asset.class);
+        assertEquals(asset.getType(), "credit_alphanum4");
+        AssetTypeCreditAlphaNum creditAsset = (AssetTypeCreditAlphaNum) asset;
+        assertEquals(creditAsset.getCode(), "CNY");
+        assertEquals(creditAsset.getIssuer().getAccountId(), "GAREELUB43IRHWEASCFBLKHURCGMHE5IF6XSE7EXDLACYHGRHM43RFOX");
+    }
+}