trying to load custom plugin in tests

platform/platform-impl/src/com/intellij/ide/plugins/PluginManager.java

@@ -1049,7 +1049,7 @@ public class PluginManager {
     PluginId pluginId = pluginDescriptor.getPluginId();
     File pluginRoot = pluginDescriptor.getPath();
 
-    if (isUnitTestMode()) return null;
+    if (classPath.length == 0) return null;
     try {
       final List<URL> urls = new ArrayList<URL>(classPath.length);
       for (File aClassPath : classPath) {

platform/platform-impl/src/com/intellij/openapi/vfs/newvfs/persistent/FSRecords.java

@@ -416,6 +416,7 @@ public class FSRecords implements Forceable {
         myRecords.close();
         myRecords = null;
       }
+      ourInitialized = false;
     }
 
     private static void markClean() {

platform/util/src/com/intellij/openapi/application/PathManager.java

@@ -25,6 +25,7 @@ import com.intellij.util.io.URLUtil;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.TestOnly;
 
 import java.io.*;
 import java.net.URL;
@@ -429,4 +430,9 @@ public class PathManager {
     }
     return new File(getHomePath() + File.separator + "community" + File.separator + "lib" + File.separator + relativePath);
   }
+
+  @TestOnly
+  public static void cleanup() {
+    ourPluginsPath = null;
+  }
 }