Merge branch 'master' of https://github.com/apache/spark into stage-page-timeline

Author: sarutak

mllib/src/test/java/org/apache/spark/ml/util/IdentifiableSuite.scala

@@ -0,0 +1,40 @@
+/*
+ * 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.util
+
+import org.scalatest.FunSuite
+
+class IdentifiableSuite extends FunSuite {
+
+  import IdentifiableSuite.Test
+
+  test("Identifiable") {
+    val test0 = new Test("test_0")
+    assert(test0.uid === "test_0")
+
+    val test1 = new Test
+    assert(test1.uid.startsWith("test_"))
+  }
+}
+
+object IdentifiableSuite {
+
+  class Test(override val uid: String) extends Identifiable {
+    def this() = this(Identifiable.randomUID("test"))
+  }
+}