EnumWithObfuscatedTest.java

package com.google.gson.functional;

import com.google.gson.Gson;
import com.google.gson.annotations.SerializedName;

import junit.framework.TestCase;

public class EnumWithObfuscatedTest extends TestCase {
  private Gson gson;

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    gson = new Gson();
  }

  public enum Gender {
    @SerializedName("MAIL")
    MALE,

    @SerializedName("FEMAIL")
    FEMALE
  }

  public void testEnumClassWithObfuscated() {
    assertEquals(Gender.MALE, gson.fromJson("\"MAIL\"", Gender.class));
    assertEquals("\"MAIL\"", gson.toJson(Gender.MALE, Gender.class));
  }
}

pom.xml

+       <plugin>
+         <groupId>com.github.wvengen</groupId>
+         <artifactId>proguard-maven-plugin</artifactId>
+         <executions>
+            <execution>
+                <phase>process-test-classes</phase>
+                <goals><goal>proguard</goal></goals>
+            </execution>
+         </executions>
+         <configuration>
+             <injar>test-classes</injar> 
+             <outjar>test-classes</outjar> 
+             <inFilter>com/google/gson/functional/EnumWithObfuscatedTest$Gender</inFilter>
+             <!-- options from Android Gradle Plugins -->
+             <options>
+                 <option>-optimizations !code/simplification/arithmetic,!code/simplification/cast,!field/*,!class/merging/*</option  >
+                 <option>-optimizationpasses 1</option> 
+                 <option>-allowaccessmodification</option>
+                 <option>-keepattributes *Annotation*,Signature,InnerClasses,EnclosingMethod</option>
+                 <option>-keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String); }</opt  ion>
+             </options>
+             <libs>
+                 <lib>${java.home}/lib/rt.jar</lib>
+             </libs>   
+         </configuration>
+       </plugin>