add unit test flie

mllib/src/test/scala/org/apache/spark/ml/clustering/PowerIterationClusteringSuite.scala

@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.ml.clustering
+
+import scala.collection.mutable
+import scala.util.Random
+import org.apache.spark.{SparkContext, SparkFunSuite}
+import org.apache.spark.graphx.{Edge, Graph}
+import org.apache.spark.ml.util.DefaultReadWriteTest
+import org.apache.spark.mllib.util.MLlibTestSparkContext
+import org.apache.spark.mllib.util.TestingUtils._
+import org.apache.spark.util.Utils
+
+class PowerIterationClusteringSuite extends SparkFunSuite
+  with MLlibTestSparkContext with DefaultReadWriteTest {
+
+  import org.apache.spark.ml.clustering.PowerIterationClustering._
+
+
+}