From 65e4edeb023283190040dcf9b1566e8991dbe0da Mon Sep 17 00:00:00 2001
From: "Gregory.Shrago" <gregory.shrago@jetbrains.com>
Date: Tue, 15 Nov 2016 01:57:02 +0300
Subject: [PATCH] improve error report

---
 .../openapi/vfs/ex/dummy/DummyCachingFileSystem.java      | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/platform/platform-impl/src/com/intellij/openapi/vfs/ex/dummy/DummyCachingFileSystem.java b/platform/platform-impl/src/com/intellij/openapi/vfs/ex/dummy/DummyCachingFileSystem.java
index 40bde0ea332f..9d3d38412fd7 100644
--- a/platform/platform-impl/src/com/intellij/openapi/vfs/ex/dummy/DummyCachingFileSystem.java
+++ b/platform/platform-impl/src/com/intellij/openapi/vfs/ex/dummy/DummyCachingFileSystem.java
@@ -121,6 +121,14 @@ public abstract class DummyCachingFileSystem<T extends VirtualFile> extends Dumm
     return list == null || list.size() > 1 ? null : list.get(0);
   }
 
+  @NotNull
+  public Project getProjectOrFail(String projectId) {
+    List<Project> list = myProject2Id.getKeysByValue(projectId);
+    if (list == null || list.isEmpty()) throw new AssertionError(projectId + " project not found: " + myProject2Id.values());
+    if (list.size() != 1) throw new AssertionError(projectId + " is mapped to several projects: " + list);
+    return list.get(0);
+  }
+
   @NotNull
   public Collection<T> getCachedFiles() {
     return myCachedFiles.notNullValues();