Issue 4231 - Fix unstable FilterEngineTest.testSetRemoveFilterChangeCallback

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

Index: libadblockplus-android-tests/src/org/adblockplus/libadblockplus/tests/AndroidFileSystemTest.java
diff --git a/libadblockplus-android-tests/src/org/adblockplus/libadblockplus/tests/AndroidFileSystemTest.java b/libadblockplus-android-tests/src/org/adblockplus/libadblockplus/tests/AndroidFileSystemTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..43a25b4dd165dc3db246334220204971a9ea6848
--- /dev/null
+++ b/libadblockplus-android-tests/src/org/adblockplus/libadblockplus/tests/AndroidFileSystemTest.java
@@ -0,0 +1,295 @@
+/*
+ * 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 android.test.AndroidTestCase;
+
+import org.adblockplus.android.AndroidFileSystem;
+import org.adblockplus.libadblockplus.AdblockPlusException;
+import org.adblockplus.libadblockplus.FileSystem;
+import org.adblockplus.libadblockplus.FileSystemUtils;
+import org.junit.Test;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+public class AndroidFileSystemTest extends AndroidTestCase
+{
+  protected final FileSystemUtils fileSystemUtils = new FileSystemUtils();
+  protected final static String DATA = "12345qwerty";
+  protected AndroidFileSystem fileSystem;
+
+  @Override
+  protected void setUp() throws Exception
+  {
+    fileSystem = new AndroidFileSystem(getContext().getCacheDir());
+  }
+
+  protected String generateUniqueFilename()
+  {
+    return fileSystemUtils.generateUniqueFileName("file", ".tmp");
+  }
+
+  protected File getFullPath(String path)
+  {
+    return new File(fileSystem.getBasePath(), path);
+  }
+
+  @Test
+  public void testWriteNullFile() throws FileNotFoundException
+  {
+    String path = generateUniqueFilename();
+    File file = getFullPath(path);
+    assertFalse(file.exists());
+
+    fileSystem.write(path, null);
+
+    assertTrue(file.exists());
+    assertEquals("", fileSystemUtils.readFile(file));
+  }
+
+  @Test
+  public void testWriteEmptyFile() throws FileNotFoundException
+  {
+    String path = generateUniqueFilename();
+    File file = getFullPath(path);
+    assertFalse(file.exists());
+
+    fileSystem.write(path, "");
+
+    assertTrue(file.exists());
+    assertEquals("", fileSystemUtils.readFile(file));
+  }
+
+  @Test
+  public void testWriteInvalidPath()
+  {
+    String path = "notExistingDirectory/" + generateUniqueFilename();
+    File file = getFullPath(path);
+    assertFalse(file.exists());
+    File notExistingDirectoryFile = file.getParentFile();
+    assertFalse(notExistingDirectoryFile.exists());
+
+    try
+    {
+      fileSystem.write(path, DATA);
+      fail("Exception should be thrown");
+    }
+    catch (AdblockPlusException e)
+    {
+      // ignored
+    }
+  }
+
+  @Test
+  public void testWriteSingleLineData() throws FileNotFoundException
+  {
+    String path = generateUniqueFilename();
+    File file = getFullPath(path);
+    assertFalse(file.exists());
+
+    final String SINGLE_LINE_DATA = DATA.replace("\n", "");
+    fileSystem.write(path, SINGLE_LINE_DATA);
+
+    assertTrue(file.exists());
+    assertEquals(SINGLE_LINE_DATA, fileSystemUtils.readFile(file));
+  }
+
+  @Test
+  public void testWriteMultiLineData() throws FileNotFoundException
+  {
+    String path = generateUniqueFilename();
+    File file = getFullPath(path);
+    assertFalse(file.exists());
+
+    final String MULTI_LINE_DATA = DATA + "\n" + DATA;
+    fileSystem.write(path, MULTI_LINE_DATA);
+
+    assertTrue(file.exists());
+    assertEquals(MULTI_LINE_DATA, fileSystemUtils.readFile(file));
+  }
+
+  @Test
+  public void testReadEmptyFile() throws IOException
+  {
+    String path = generateUniqueFilename();
+    File file = getFullPath(path);
+    assertFalse(file.exists());
+
+    fileSystemUtils.writeFile(file, "");
+    assertTrue(file.exists());
+
+    assertEquals("", fileSystem.read(path));
+  }
+
+  @Test
+  public void testReadSingleLineData() throws IOException
+  {
+    String path = generateUniqueFilename();
+    File file = getFullPath(path);
+    assertFalse(file.exists());
+
+    final String SINGLE_LINE_DATA = DATA.replace("\n", "");
+    fileSystemUtils.writeFile(file, SINGLE_LINE_DATA);
+    assertTrue(file.exists());
+
+    assertEquals(SINGLE_LINE_DATA, fileSystem.read(path));
+  }
+
+  @Test
+  public void testReadMultiLineData() throws IOException
+  {
+    String path = generateUniqueFilename();
+    File file = getFullPath(path);
+    assertFalse(file.exists());
+
+    final String MULTI_LINE_DATA = DATA + "\n" + DATA;
+    fileSystemUtils.writeFile(file, MULTI_LINE_DATA);
+    assertTrue(file.exists());
+
+    assertEquals(MULTI_LINE_DATA, fileSystem.read(path));
+  }
+
+  @Test
+  public void testMoveExistingFile() throws IOException
+  {
+    String fromPath = generateUniqueFilename();
+    File fromFile = getFullPath(fromPath);
+    String toPath = generateUniqueFilename();
+    File toFile = getFullPath(toPath);
+    fileSystemUtils.writeFile(fromFile, DATA);
+
+    assertTrue(fromFile.exists());
+    assertFalse(toFile.exists());
+
+    fileSystem.move(fromPath, toPath);
+
+    assertFalse(fromFile.exists());
+    assertTrue(toFile.exists());
+    assertEquals(DATA, fileSystemUtils.readFile(toFile));
+  }
+
+  @Test
+  public void testMoveNotExistingFile()
+  {
+    String fromPath = generateUniqueFilename();
+    File fromFile = getFullPath(fromPath);
+    String toPath = generateUniqueFilename();
+    assertFalse(fromFile.exists());
+
+    try
+    {
+      fileSystem.move(fromPath, toPath);
+      fail("Exception should be thrown");
+    }
+    catch (AdblockPlusException e)
+    {
+      // ignored
+    }
+  }
+
+  @Test
+  public void testRemoveExistingFile() throws IOException
+  {
+    String path = generateUniqueFilename();
+    File file = getFullPath(path);
+    fileSystemUtils.writeFile(file, DATA);
+
+    assertTrue(file.exists());
+    fileSystem.remove(path);
+    assertFalse(file.exists());
+  }
+
+  @Test
+  public void testRemoveNotExistingFile()
+  {
+    String path = generateUniqueFilename();
+    File file = getFullPath(path);
+    assertFalse(file.exists());
+
+    fileSystem.remove(path);
+    assertFalse(file.exists());
+  }
+
+  @Test
+  public void testStatExistingFile() throws IOException
+  {
+    String path = generateUniqueFilename();
+    File file = getFullPath(path);
+    fileSystemUtils.writeFile(file, DATA);
+    assertTrue(file.exists());
+
+    FileSystem.StatResult stat = fileSystem.stat(path);
+    assertNotNull(stat);
+    assertTrue(stat.exists());
+    assertFalse(stat.isDirectory());
+    assertTrue(stat.isFile());
+    assertTrue(stat.getLastModified() > 0);
+  }
+
+  @Test
+  public void testStatExistingDirectory()
+  {
+    String path = generateUniqueFilename();
+    File file = getFullPath(path);
+    file.mkdir();
+
+    FileSystem.StatResult stat = fileSystem.stat(path);
+    assertNotNull(stat);
+    assertTrue(stat.exists());
+    assertFalse(stat.isFile());
+    assertTrue(stat.isDirectory());
+    assertTrue(stat.getLastModified() > 0);
+  }
+
+  @Test
+  public void testStatNotExistingFile()
+  {
+    String path = generateUniqueFilename();
+    File file = getFullPath(path);
+    assertFalse(file.exists());
+
+    fileSystem.remove(path);
+    assertFalse(file.exists());
+    FileSystem.StatResult notExistingStat = fileSystem.stat(path);
+    assertFalse(notExistingStat.exists());
+    assertEquals(0l, notExistingStat.getLastModified());
+  }
+
+  @Test
+  public void testResolveAbsolute()
+  {
+    String path = generateUniqueFilename();
+    String absolutePath = fileSystem.resolve(path);
+    String fullPath = getFullPath(path).getAbsolutePath();
+    String fullPathFromBasePath = fullPath
+      .substring(fileSystem.getBasePath()
+      .getAbsolutePath().length());
+    assertEquals(fullPathFromBasePath, absolutePath);
+  }
+
+  @Test
+  public void testResolveRelative()
+  {
+    String relativePath = "./file";
+    String absolutePath = fileSystem.resolve(relativePath);
+    assertNotNull(absolutePath);
+    assertTrue(absolutePath.startsWith("/"));
+  }
+}