Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/7415#discussion_r34752606
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/util/StopwatchSuite.scala ---
@@ -0,0 +1,109 @@
+/*
+ * 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.apache.spark.SparkFunSuite
+import org.apache.spark.mllib.util.MLlibTestSparkContext
+
+class StopwatchSuite extends SparkFunSuite with MLlibTestSparkContext {
+
+ private def testStopwatchOnDriver(sw: Stopwatch): Unit = {
+ assert(sw.name === "sw")
+ assert(sw.elapsed() === 0L)
+ assert(!sw.isRunning)
+ intercept[AssertionError] {
+ sw.stop()
+ }
+ sw.start()
+ Thread.sleep(50)
+ val duration = sw.stop()
+ assert(duration >= 50 && duration < 100) // using a loose upper bound
+ val elapsed = sw.elapsed()
+ assert(elapsed === duration)
+ sw.start()
+ Thread.sleep(50)
+ val duration2 = sw.stop()
+ assert(duration2 >= 50 && duration2 < 100)
+ val elapsed2 = sw.elapsed()
+ assert(elapsed2 == duration + duration2)
--- End diff --
Actually @ericl pointed out `==` and `===` are equal in this case (Long).
Both provide the same error message. I will update it to be consistent.
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