add CachingClusteredClient tests

server/src/test/java/io/druid/client/RangeIterable.java

@@ -0,0 +1,89 @@
+/*
+ * Druid - a distributed column store.
+ * Copyright (C) 2012, 2013, 2014  Metamarkets Group Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package io.druid.client;
+
+import java.util.Iterator;
+
+/**
+ */
+public class RangeIterable implements Iterable<Integer>
+{
+  private final int end;
+  private final int start;
+  private final int increment;
+
+  public RangeIterable(
+      int end
+  )
+  {
+    this(0, end);
+  }
+
+  public RangeIterable(
+      int start,
+      int end
+  )
+  {
+    this(start, end, 1);
+  }
+
+  public RangeIterable(
+      int start,
+      int end,
+      final int i
+  )
+  {
+    this.start = start;
+    this.end = end;
+    this.increment = i;
+  }
+
+  @Override
+  public Iterator<Integer> iterator()
+  {
+    return new Iterator<Integer>()
+    {
+      private int curr = start;
+
+      @Override
+      public boolean hasNext()
+      {
+        return curr < end;
+      }
+
+      @Override
+      public Integer next()
+      {
+        try {
+          return curr;
+        }
+        finally {
+          curr += increment;
+        }
+      }
+
+      @Override
+      public void remove()
+      {
+        throw new UnsupportedOperationException();
+      }
+    };
+  }
+}