Add tests for projectinfo command

src/harness/fourslash.ts

@@ -1818,6 +1818,21 @@ module FourSlash {
             }
         }
 
+        private verifyProjectInfo(expected: string[]) {
+            if (this.testType == FourSlashTestType.Server) {
+                let actual = (<ts.server.SessionClient>this.languageService).getProjectInfo(
+                    this.activeFile.fileName,
+                    /* needFileNameList */ true
+                    );
+                assert.equal(
+                    expected.join(","),
+                    actual.fileNameList.map( file => {
+                        return file.replace(this.basePath + "/", "")
+                        }).join(",")
+                    );
+            }
+        }
+
         public verifySemanticClassifications(expected: { classificationType: string; text: string }[]) {
             var actual = this.languageService.getSemanticClassifications(this.activeFile.fileName,
                 ts.createTextSpan(0, this.activeFile.content.length));

src/server/client.ts

@@ -171,6 +171,21 @@ module ts.server {
                 documentation: [{ kind: "text", text: response.body.documentation }]
             };
         }
+
+        getProjectInfo(fileName: string, needFileNameList: boolean): protocol.ProjectInfo {
+            var args: protocol.ProjectInfoRequestArgs = {
+                file: fileName,
+                needFileNameList: !!needFileNameList
+            };
+
+            var request = this.processRequest<protocol.ProjectInfoRequest>(CommandNames.ProjectInfo, args);
+            var response = this.processResponse<protocol.ProjectInfoResponse>(request);
+
+            return {
+                configFileName: response.body.configFileName,
+                fileNameList: response.body.fileNameList
+            };
+        }
         
         getCompletionsAtPosition(fileName: string, position: number): CompletionInfo {
             var lineOffset = this.positionToOneBasedLineOffset(fileName, position);

src/server/protocol.d.ts

@@ -90,25 +90,29 @@ declare module ts.server.protocol {
     /** 
       * Arguments for ProjectInfoResponse messages.
       */
-    export interface ProjectInfoRequestArgs {
-        /**
-          * The file for the request (absolute pathname required).
-          */
-        file: string;
+    export interface ProjectInfoRequestArgs extends FileRequestArgs {
         /**
           * Indicate if the file name list of the project is needed
           */
         needFileNameList: boolean;
     }
 
+    export interface ProjectInfoRequest extends Request {
+        arguments: ProjectInfoRequestArgs
+    }
+
     /** 
       * Response message for "projectInfo" request
       */
-    export interface ProjectInfoResponse {
+    export interface ProjectInfo {
         configFileName: string;
         fileNameList?: string[];
     }
 
+    export interface ProjectInfoResponse extends Response {
+        body?: ProjectInfo;
+    }
+
     /**
       * Request whose sole parameter is a file name.
       */

src/server/session.ts

@@ -339,18 +339,19 @@ module ts.server {
             });
         }
 
-        getProjectInfo(fileName: string, needFileNameList: boolean): protocol.ProjectInfoResponse {
+        getProjectInfo(fileName: string, needFileNameList: boolean): protocol.ProjectInfo {
             fileName = ts.normalizePath(fileName)
             let project = this.projectService.getProjectForFile(fileName)
 
-            let projectInfoResponse: protocol.ProjectInfoResponse = {
+            let projectInfo: protocol.ProjectInfo = {
                 configFileName: project.projectFilename
             }
 
             if (needFileNameList) {
-                projectInfoResponse.fileNameList = project.getFileNameList();
+                projectInfo.fileNameList = project.getFileNameList();
             }
-            return projectInfoResponse;
+
+            return projectInfo;
         }
 
         getRenameLocations(line: number, offset: number, fileName: string,findInComments: boolean, findInStrings: boolean): protocol.RenameResponseBody {

tests/cases/fourslash/fourslash.ts

@@ -455,6 +455,10 @@ module FourSlashInterface {
         public getSemanticDiagnostics(expected: string) {
             FourSlash.currentTestState.getSemanticDiagnostics(expected);
         }
+
+        public ProjectInfo(expected: string []) {
+            FourSlash.currentTestState.verifyProjectInfo(expected);
+        }
     }
 
     export class edit {

tests/cases/fourslash/server/projectInfo.ts

@@ -0,0 +1,10 @@
+/// <reference path="../fourslash.ts"/>
+
+// @Filename: a.ts
+//// import test from "b"
+
+// @Filename: b.ts
+//// export var test = "test String"
+
+goTo.file("a.ts")
+verify.ProjectInfo(["lib.d.ts", "b.ts", "a.ts"])