cleanup (var -> val)

plugins/devkit/testSources/build/PluginModuleCompilationTest.kt

@@ -1,18 +1,4 @@
-/*
- * Copyright 2000-2016 JetBrains s.r.o.
- *
- * Licensed 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.
- */
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.idea.devkit.build
 
 import com.intellij.compiler.BaseCompilerTestCase
@@ -41,12 +27,11 @@ import java.util.*
  * @author nik
  */
 class PluginModuleCompilationTest : BaseCompilerTestCase() {
-
   override fun setUpJdk() {
     super.setUpJdk()
     runWriteAction {
       val table = ProjectJdkTable.getInstance()
-      var pluginSdk: Sdk = table.createSdk("IDEA plugin SDK", SdkType.findInstance(IdeaJdk::class.java))
+      val pluginSdk: Sdk = table.createSdk("IDEA plugin SDK", SdkType.findInstance(IdeaJdk::class.java))
       val modificator = pluginSdk.sdkModificator
       modificator.sdkAdditionalData = Sandbox(getSandboxPath(), testProjectJdk, pluginSdk)
       val rootPath = FileUtil.toSystemIndependentName(PathManager.getJarPathForClass(FileUtilRt::class.java)!!)