Add debugging utilities

Author: mhegazy

src/harness/fourslash.ts

@@ -1,4 +1,4 @@
-//
+//
 // Copyright (c) Microsoft Corporation.  All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -2550,6 +2550,11 @@ namespace FourSlash {
             }
         }
 
+        public printAvailableCodeFixes() {
+            const codeFixes = this.getCodeFixActions(this.activeFile.fileName);
+            Harness.IO.log(stringify(codeFixes));
+        }
+
         // Get the text of the entire line the caret is currently at
         private getCurrentLineContent() {
             const text = this.getFileContent(this.activeFile.fileName);
@@ -3738,6 +3743,10 @@ namespace FourSlashInterface {
             this.state.printCompletionListMembers();
         }
 
+        public printAvailableCodeFixes() {
+            this.state.printAvailableCodeFixes();
+        }
+
         public printBreakpointLocation(pos: number) {
             this.state.printBreakpointLocation(pos);
         }

tests/cases/fourslash/fourslash.ts

@@ -296,6 +296,7 @@ declare namespace FourSlashInterface {
         printCurrentQuickInfo(): void;
         printCurrentSignatureHelp(): void;
         printCompletionListMembers(): void;
+        printAvailableCodeFixes(): void;
         printBreakpointLocation(pos: number): void;
         printBreakpointAtCurrentLocation(): void;
         printNameOrDottedNameSpans(pos: number): void;