From b9ea3471a404339fa09a0cd4170889fc321d66bd Mon Sep 17 00:00:00 2001
From: Benjamin Lichtman <belichtm@microsoft.com>
Date: Thu, 28 Dec 2017 11:22:41 -0800
Subject: [PATCH] Simplify test and add explanatory assertion

---
 src/harness/unittests/tsserverProjectSystem.ts | 6 +-----
 src/server/editorServices.ts                   | 1 +
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/src/harness/unittests/tsserverProjectSystem.ts b/src/harness/unittests/tsserverProjectSystem.ts
index 438575917c8..34c8f9e9656 100644
--- a/src/harness/unittests/tsserverProjectSystem.ts
+++ b/src/harness/unittests/tsserverProjectSystem.ts
@@ -1185,13 +1185,9 @@ namespace ts.projectSystem {
         });
 
         it("external project for dynamic file", () => {
-            const file1 = {
-                path: "/a/b/f1.ts",
-                content: "let x =1;"
-            };
             const externalProjectName = "^ScriptDocument1 file1.ts";
             const externalFiles = toExternalFiles(["^ScriptDocument1 file1.ts"]);
-            const host = createServerHost([file1]);
+            const host = createServerHost([]);
             const projectService = createProjectService(host);
             projectService.openExternalProject({
                 rootFiles: externalFiles,
diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index 0110e88f773..664938a4cdc 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -1779,6 +1779,7 @@ namespace ts.server {
                 const isDynamic = isDynamicFileName(fileName);
                 Debug.assert(isRootedDiskPath(fileName) || isDynamic || openedByClient, "Script info with non-dynamic relative file name can only be open script info");
                 Debug.assert(!isRootedDiskPath(fileName) || this.currentDirectory === currentDirectory || !this.openFilesWithNonRootedDiskPath.has(this.toCanonicalFileName(fileName)), "Open script files with non rooted disk path opened with current directory context cannot have same canonical names");
+                Debug.assert(!isDynamic || this.currentDirectory === currentDirectory, "Dynamic files must always have current directory context since containing external project name will always match the script info name.");
                 // If the file is not opened by client and the file doesnot exist on the disk, return
                 if (!openedByClient && !isDynamic && !(hostToQueryFileExistsOn || this.host).fileExists(fileName)) {
                     return;