Use RiakUserMetadata.containsKey() charset parameter

src/main/java/com/basho/riak/client/core/query/UserMetadata/RiakUserMetadata.java

@@ -78,7 +78,7 @@ public boolean containsKey(String key)
      */
     public boolean containsKey(String key, Charset charset)
     {
-        return meta.containsKey(BinaryValue.unsafeCreate(key.getBytes()));
+        return meta.containsKey(BinaryValue.unsafeCreate(key.getBytes(charset)));
     }
 
     /**

src/test/java/com/basho/riak/client/core/query/UserMetadata/RiakUserMetadataTest.java

@@ -0,0 +1,53 @@
+package com.basho.riak.client.core.query.UserMetadata;
+
+import com.basho.riak.client.core.util.BinaryValue;
+import org.junit.Test;
+
+import java.nio.charset.Charset;
+
+import static junit.framework.TestCase.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+public class RiakUserMetadataTest
+{
+    final Charset utf16 = Charset.forName("UTF-16");
+    final String oddKey = "\uD834\uDD1E\uD835\uDD65";
+    final String oddValue = "\uD835\uDFF6\uD840\uDC8A";
+    final BinaryValue oddKeyBV = BinaryValue.create(oddKey, utf16);
+    final BinaryValue oddValueBV = BinaryValue.create(oddValue, utf16);
+
+    @Test
+    public void getSetMetadata_string_altCharset()
+    {
+        RiakUserMetadata md = new RiakUserMetadata();
+        md.put(oddKey, oddValue, utf16);
+        final String gotValue = md.get(oddKey, utf16);
+
+        assertEquals(oddValue, gotValue);
+        assertNotEquals(gotValue, md.get(oddKey));
+    }
+
+    @Test
+    public void getSetMetadata_binaryValue_altCharset()
+    {
+        RiakUserMetadata md = new RiakUserMetadata();
+        md.put(oddKeyBV, oddValueBV);
+        final BinaryValue gotValue = md.get(oddKeyBV);
+
+        assertEquals(oddValueBV, gotValue);
+        assertNotEquals(gotValue, md.get(oddKey));
+    }
+
+    @Test
+    public void getSetMetadata_mixedInterfaces_altCharset()
+    {
+        RiakUserMetadata md = new RiakUserMetadata();
+        md.put(oddKeyBV, oddValueBV);
+
+        final String gotValue = md.get(oddKey, utf16);
+
+        assertEquals(oddValue, gotValue);
+    }
+}