Issue 4181 - Fix FilterEngineTest tests

libadblockplus-android-tests/src/org/adblockplus/libadblockplus/tests/BaseJsTest.java

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package org.adblockplus.libadblockplus.tests;
 
 import org.adblockplus.libadblockplus.AppInfo;
+import org.adblockplus.libadblockplus.FileSystemHelper;
 import org.adblockplus.libadblockplus.JsEngine;
-import org.adblockplus.libadblockplus.LazyLogSystem;
 import org.adblockplus.libadblockplus.ThrowingWebRequest;
 
 import android.test.AndroidTestCase;
 
+import java.io.File;
+import java.io.IOException;
+
 public abstract class BaseJsTest extends AndroidTestCase
 {
     protected JsEngine jsEngine;
+    protected File tmpFileSystemPath;
+    protected FileSystemHelper fileSystemHelper = new FileSystemHelper();
+
+    protected File buildTmpFileSystemPath() throws IOException
+    {
+        File tmpFileSystemPath = fileSystemHelper
+            .generateUniqueFileName(null, ".fs", getContext().getCacheDir());
+        tmpFileSystemPath.mkdirs();
+        return tmpFileSystemPath;
+    }
 
     @Override
     protected void setUp() throws Exception
     {
         super.setUp();
 
         jsEngine = new JsEngine(AppInfo.builder().build());
         jsEngine.setDefaultLogSystem();
-        jsEngine.setDefaultFileSystem(getContext().getFilesDir().getAbsolutePath());
+
+        // we need to generate new file system path in order
+        // not to have JsEngine state from the previous test
+        tmpFileSystemPath = buildTmpFileSystemPath();
+        jsEngine.setDefaultFileSystem(tmpFileSystemPath.getAbsolutePath());
         jsEngine.setWebRequest(new ThrowingWebRequest());
     }
+
+    protected void cleanupFileSystem()
+    {
+        if (tmpFileSystemPath != null && tmpFileSystemPath.exists())
+        {
+            fileSystemHelper.delete(tmpFileSystemPath, true);
+            tmpFileSystemPath = null;
+        }
+    }
+
+    @Override
+    protected void tearDown() throws Exception
+    {
+        cleanupFileSystem();
+        super.tearDown();
+    }
 }