Enable Integration Tests to expose Logger output

Author: Piotr Puszkiewicz

src/logger.ts

@@ -2,6 +2,11 @@
  *  Copyright (c) Microsoft Corporation. All rights reserved.
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
+let Subscriber: (message: string) => void;
+
+export function SubscribeToAllLoggers(subscriber: (message:string) => void) {
+    Subscriber = subscriber;
+}
 
 export class Logger {
     private _writer: (message: string) => void;
@@ -20,17 +25,17 @@ export class Logger {
         if (this._atLineStart) {
             if (this._indentLevel > 0) {
                 const indent = " ".repeat(this._indentLevel * this._indentSize);
-                this._writer(indent);
+                this.write(indent);
             }
 
             if (this._prefix) {
-                this._writer(`[${this._prefix}] `);
+                this.write(`[${this._prefix}] `);
             }
 
             this._atLineStart = false;
         }
 
-        this._writer(message); 
+        this.write(message); 
     }
 
     public increaseIndent(): void {
@@ -53,4 +58,12 @@ export class Logger {
         this._appendCore(message + '\n');
         this._atLineStart = true;
     }
+
+    private write(message: string) {
+        this._writer(message);
+
+        if (Subscriber) {
+            Subscriber(message);
+        }
+    }
 }

test/integrationTests/index.ts

@@ -3,6 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
+import { SubscribeToAllLoggers } from "../../src/logger";
 //
 // PLEASE DO NOT MODIFY / DELETE UNLESS YOU KNOW WHAT YOU ARE DOING
 //
@@ -26,4 +27,6 @@ testRunner.configure({
     useColors: true // colored output from test results
 });
 
+SubscribeToAllLoggers(message => console.log(message));
+
 module.exports = testRunner;

test/unitTests/index.ts

@@ -3,6 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
+import { SubscribeToAllLoggers } from "../../src/logger";
 //
 // PLEASE DO NOT MODIFY / DELETE UNLESS YOU KNOW WHAT YOU ARE DOING
 //
@@ -26,4 +27,6 @@ testRunner.configure({
     useColors: true // colored output from test results
 });
 
+SubscribeToAllLoggers(message => console.log(message));
+
 module.exports = testRunner;