get rid of TestUtils.createResource() via inlining

Author: HeartSaVioR

core/src/main/scala/org/apache/spark/TestUtils.scala

@@ -159,16 +159,6 @@ private[spark] object TestUtils {
     createCompiledClass(className, destDir, sourceFile, classpathUrls)
   }
 
-  def createResource(
-      resourceName: String,
-      destDir: File,
-      fileContent: String = "test"): File = {
-    val out: File = new File(destDir, resourceName)
-    Files.write(fileContent.getBytes(StandardCharsets.UTF_8), out)
-    assert(out.exists(), "Resource file is not written: " + out.getAbsolutePath())
-    out
-  }
-
   /**
    * Run some code involving jobs submitted to the given context and assert that the jobs spilled.
    */

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

@@ -19,8 +19,11 @@ package org.apache.spark.repl
 
 import java.io.File
 import java.net.{URL, URLClassLoader}
+import java.nio.charset.StandardCharsets
 import java.util
 
+import com.google.common.io.Files
+
 import scala.concurrent.duration._
 import scala.io.Source
 import scala.language.implicitConversions
@@ -57,7 +60,8 @@ class ExecutorClassLoaderSuite
     url1 = "file://" + tempDir1
     urls2 = List(tempDir2.toURI.toURL).toArray
     childClassNames.foreach(TestUtils.createCompiledClass(_, tempDir1, "1"))
-    parentResourceNames.foreach(TestUtils.createResource(_, tempDir2, "resource"))
+    parentResourceNames.foreach(x =>
+      Files.write("resource".getBytes(StandardCharsets.UTF_8), new File(tempDir2, x)))
     parentClassNames.foreach(TestUtils.createCompiledClass(_, tempDir2, "2"))
   }