Github user WeichenXu123 commented on a diff in the pull request:
https://github.com/apache/spark/pull/19843#discussion_r158692700
--- Diff: mllib/src/test/scala/org/apache/spark/ml/util/MLTest.scala ---
@@ -0,0 +1,91 @@
+/*
+ * 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 java.io.File
+
+import org.scalatest.Suite
+
+import org.apache.spark.SparkContext
+import org.apache.spark.ml.{PipelineModel, Transformer}
+import org.apache.spark.sql.{DataFrame, Encoder, Row}
+import org.apache.spark.sql.execution.streaming.MemoryStream
+import org.apache.spark.sql.streaming.StreamTest
+import org.apache.spark.sql.test.TestSparkSession
+import org.apache.spark.util.Utils
+
+trait MLTest extends StreamTest with TempDirectory { self: Suite =>
--- End diff --
But my intention here, is let every ml test suite inherit `MLTest`.
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