diff --git a/platform/util/src/com/intellij/openapi/util/io/FileSystemUtil.java b/platform/util/src/com/intellij/openapi/util/io/FileSystemUtil.java
index b22a09e22d07..e38a99e630a1 100644
--- a/platform/util/src/com/intellij/openapi/util/io/FileSystemUtil.java
+++ b/platform/util/src/com/intellij/openapi/util/io/FileSystemUtil.java
@@ -44,6 +44,19 @@ public class FileSystemUtil {
 
   private static final Logger LOG = Logger.getInstance("#com.intellij.openapi.util.io.FileSystemUtil");
 
+  private interface Mediator {
+    @Nullable
+    FileAttributes getAttributes(@NotNull String path) throws Exception;
+
+    @Nullable
+    String resolveSymLink(@NotNull String path) throws Exception;
+
+    void setPermissions(@NotNull String path, int permissions) throws Exception;
+
+    @NotNull
+    String getName();
+  }
+
   @NotNull
   private static Mediator ourMediator = getMediator();
 
@@ -51,16 +64,16 @@ public class FileSystemUtil {
     final boolean forceUseNio2 = SystemProperties.getBooleanProperty(FORCE_USE_NIO2_KEY, false);
     final String quickTestPath = SystemInfo.isWindows ? "C:\\" :  "/";
 
-    // todo: move IdeaWin32 interface to this package, add mediator
-
-    if (!forceUseNio2 && (SystemInfo.isLinux || SystemInfo.isMac || SystemInfo.isSolaris || SystemInfo.isFreeBSD)) {
-      try {
-        final Mediator mediator = new JnaUnixMediatorImpl();
-        mediator.getAttributes(quickTestPath);
-        return mediator;
-      }
-      catch (Throwable t) {
-        LOG.warn(t);
+    if (!forceUseNio2) {
+      if (SystemInfo.isLinux || SystemInfo.isMac || SystemInfo.isSolaris || SystemInfo.isFreeBSD) {
+        try {
+          final Mediator mediator = new JnaUnixMediatorImpl();
+          mediator.getAttributes(quickTestPath);
+          return mediator;
+        }
+        catch (Throwable t) {
+          LOG.warn(t);
+        }
       }
     }
 
@@ -84,6 +97,11 @@ public class FileSystemUtil {
     ourMediator = getMediator();
   }
 
+  @TestOnly
+  static String getMediatorName() {
+    return ourMediator.getName();
+  }
+
   private FileSystemUtil() { }
 
   @Nullable
@@ -161,15 +179,6 @@ public class FileSystemUtil {
     setPermissions(file.getAbsolutePath(), permissions);
   }
 
-  private interface Mediator {
-    @Nullable
-    FileAttributes getAttributes(@NotNull String path) throws Exception;
-
-    @Nullable
-    String resolveSymLink(@NotNull String path) throws Exception;
-
-    void setPermissions(@NotNull String path, int permissions) throws Exception;
-  }
 
   // todo[r.sh] remove reflection after migration to JDK 7
   @SuppressWarnings("OctalInteger")
@@ -267,6 +276,12 @@ public class FileSystemUtil {
       }
     }
 
+    @NotNull
+    @Override
+    public String getName() {
+      return "NIO2";
+    }
+
     private static final Map<String, Integer> ATTRIBUTES_MAP;
     static {
       ATTRIBUTES_MAP = new HashMap<String, Integer>();
@@ -314,6 +329,7 @@ public class FileSystemUtil {
     }
   }
 
+
   // thanks to SVNKit for the idea
   private static class JnaUnixMediatorImpl implements Mediator {
     @SuppressWarnings("OctalInteger")
@@ -390,8 +406,15 @@ public class FileSystemUtil {
     public void setPermissions(@NotNull final String path, final int permissions) throws Exception {
       myLibC.chmod(path, permissions & LibC.PERM_MASK);
     }
+
+    @NotNull
+    @Override
+    public String getName() {
+      return "JnaUnix";
+    }
   }
 
+
   private static class StandardMediatorImpl implements Mediator {
     // from java.io.FileSystem
     private static final int BA_REGULAR   = 0x02;
@@ -452,5 +475,11 @@ public class FileSystemUtil {
     @Override
     public void setPermissions(@NotNull final String path, final int permissions) throws Exception {
     }
+
+    @NotNull
+    @Override
+    public String getName() {
+      return "fallback";
+    }
   }
 }
diff --git a/platform/util/testSrc/com/intellij/openapi/util/io/FileAttributesNio2ReadingTest.java b/platform/util/testSrc/com/intellij/openapi/util/io/FileAttributesNio2ReadingTest.java
index ffb2674334b0..68f2e88ae01e 100644
--- a/platform/util/testSrc/com/intellij/openapi/util/io/FileAttributesNio2ReadingTest.java
+++ b/platform/util/testSrc/com/intellij/openapi/util/io/FileAttributesNio2ReadingTest.java
@@ -20,6 +20,7 @@ import org.junit.AfterClass;
 import org.junit.Before;
 import org.junit.BeforeClass;
 
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assume.assumeTrue;
 
 public class FileAttributesNio2ReadingTest extends FileAttributesReadingTest {
@@ -27,6 +28,7 @@ public class FileAttributesNio2ReadingTest extends FileAttributesReadingTest {
   public static void setUpClass() throws Exception {
     System.setProperty(FileSystemUtil.FORCE_USE_NIO2_KEY, "true");
     FileSystemUtil.resetMediator();
+    assertEquals("NIO2", FileSystemUtil.getMediatorName());
   }
 
   @AfterClass
diff --git a/platform/util/testSrc/com/intellij/openapi/util/io/FileAttributesReadingTest.java b/platform/util/testSrc/com/intellij/openapi/util/io/FileAttributesReadingTest.java
index 56bdc6fc4147..b713b2d38fab 100644
--- a/platform/util/testSrc/com/intellij/openapi/util/io/FileAttributesReadingTest.java
+++ b/platform/util/testSrc/com/intellij/openapi/util/io/FileAttributesReadingTest.java
@@ -19,6 +19,7 @@ import com.intellij.openapi.util.SystemInfo;
 import org.jetbrains.annotations.NotNull;
 import org.junit.After;
 import org.junit.Before;
+import org.junit.BeforeClass;
 import org.junit.Test;
 
 import java.io.File;
@@ -30,6 +31,12 @@ public class FileAttributesReadingTest {
   private final byte[] myTestData = new byte[]{'t', 'e', 's', 't'};
   private File myTempDirectory;
 
+  @BeforeClass
+  public static void checkMediator() throws Exception {
+    final String expectedName = SystemInfo.isWindows ? "IdeaWin32" : "JnaUnix";
+    assertEquals(expectedName, FileSystemUtil.getMediatorName());
+  }
+
   @Before
   public void setUp() throws Exception {
     myTempDirectory = FileUtil.createTempDirectory(getClass().getName(), ".tmp");
@@ -116,7 +123,7 @@ public class FileAttributesReadingTest {
   @Test
   public void linkToDirectory() throws Exception {
     final File file = FileUtil.createTempDirectory(myTempDirectory, "test.", ".tmp");
-    assertTrue(file.setWritable(false, false));
+    if (SystemInfo.isUnix) assertTrue(file.setWritable(false, false));
     assertTrue(file.setLastModified(file.lastModified() - 5000));
     final File link = IoTestUtil.createTempLink(file.getPath(), new File(myTempDirectory, "link").getPath());
 
@@ -124,7 +131,7 @@ public class FileAttributesReadingTest {
     assertEquals(FileAttributes.DIRECTORY | FileAttributes.SYM_LINK, attributes.type);
     assertEquals(file.length(), attributes.length);
     assertTimestampEquals(file.lastModified(), attributes.lastModified);
-    assertFalse(attributes.isWritable());
+    if (SystemInfo.isUnix) assertFalse(attributes.isWritable());
 
     final String target = FileSystemUtil.resolveSymLink(link);
     assertEquals(file.getPath(), target);