Test are good

core/src/test/resources/classes1/META-INF/MANIFEST.MF

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+Manifest-Version: 1.0
+Implementation-Vendor: fake-spark-class
+Implementation-Title: fake spark class
+Implementation-Version: 0.0.1
+Implementation-Vendor-Id: fake-spark-class
+Specification-Vendor: fake-spark-class
+Specification-Title: fake spark class
+Specification-Version: 0.0.1
+

repl/src/test/scala/org/apache/spark/repl/ExecutorClassLoaderSuite.scala

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+/*
+ * 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.repl
+
+import java.io.File
+import java.net.URLClassLoader
+
+import org.scalatest.FunSuite
+
+class ExecutorClassLoaderSuite extends FunSuite {
+
+  val spark_home = sys.env.get("SPARK_HOME").orElse(sys.props.get("spark.home")).get
+  val url1 = "file://" + spark_home + "/core/src/test/resources/classes1/"
+  val urls2 = List(new File(spark_home + "/core/src/test/resources/classes2/").toURI.toURL).toArray
+  test("child first") {
+    println("url1 "+url1)
+    val parentLoader = new URLClassLoader(urls2, null)
+    val classLoader = new ExecutorClassLoader(url1, parentLoader, true)
+    val fakeClass = classLoader.loadClass("org.apache.spark.test.FakeClass2").newInstance()
+    val fakeClassVersion = fakeClass.toString
+    assert(fakeClassVersion === "1")
+  }
+
+  test("parent first") {
+    val parentLoader = new URLClassLoader(urls2, null)
+    val classLoader = new ExecutorClassLoader(url1, parentLoader, false)
+    val fakeClass = classLoader.loadClass("org.apache.spark.test.FakeClass1").newInstance()
+    val fakeClassVersion = fakeClass.toString
+    assert(fakeClassVersion === "2")
+  }
+}