Adding an equals method for KeyValuePair for easier testing.

talk/app/webrtc/java/src/org/webrtc/MediaConstraints.java

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 38 matching lines @@
       return key;
     }
 
     public String getValue() {
       return value;
     }
 
     public String toString() {
       return key + ": " + value;
     }
+
+    @Override
+    public boolean equals(Object other) {
+      if (this == other) {
+        return true;
+      }
+      if (other == null || getClass() != other.getClass()) {
+        return false;
+      }
+      KeyValuePair that = (KeyValuePair)other;
+      return key.equals(that.key) && value.equals(that.value);
+    }
+
+    @Override
+    public int hashCode() {
+      return key.hashCode() + value.hashCode();
+    }
   }
 
-
   public final List<KeyValuePair> mandatory;
   public final List<KeyValuePair> optional;
 
   public MediaConstraints() {
     mandatory = new LinkedList<KeyValuePair>();
     optional = new LinkedList<KeyValuePair>();
   }
 
   private static String stringifyKeyValuePairList(List<KeyValuePair> list) {
     StringBuilder builder = new StringBuilder("[");
     for (KeyValuePair pair : list) {
       if (builder.length() > 1) {
         builder.append(", ");
       }
       builder.append(pair.toString());
     }
     return builder.append("]").toString();
   }
 
   public String toString() {
     return "mandatory: " + stringifyKeyValuePairList(mandatory) +
         ", optional: " + stringifyKeyValuePairList(optional);
   }
 }