From 8721495a6d9db6ea9b0b44a3367aa740ef8addce Mon Sep 17 00:00:00 2001
From: Benjamin Lichtman <belichtm@microsoft.com>
Date: Wed, 27 Dec 2017 13:44:51 -0800
Subject: [PATCH] Add dynamic file open test

---
 .../unittests/tsserverProjectSystem.ts        | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/harness/unittests/tsserverProjectSystem.ts b/src/harness/unittests/tsserverProjectSystem.ts
index 1b2aa481b26..c82a231da53 100644
--- a/src/harness/unittests/tsserverProjectSystem.ts
+++ b/src/harness/unittests/tsserverProjectSystem.ts
@@ -1192,6 +1192,28 @@ namespace ts.projectSystem {
             checkNumberOfInferredProjects(projectService, 0);
         });
 
+        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 projectService = createProjectService(host);
+            projectService.openExternalProject({
+                rootFiles: externalFiles,
+                options: {},
+                projectFileName: externalProjectName
+            });
+
+            checkNumberOfExternalProjects(projectService, 1);
+            checkNumberOfInferredProjects(projectService, 0);
+
+            externalFiles[0].content = "let x =1;";
+            projectService.applyChangesInOpenFiles(externalFiles, [], []);
+        });
+
         it("external project that included config files", () => {
             const file1 = {
                 path: "/a/b/f1.ts",