Updated signature.

js-fixtures/fixtures.d.ts

@@ -1,12 +1,14 @@
 declare interface Fixtures {
     path: string;
     containerId: string;
+    body(): string;
+    window(): Window;
     set(html: string): void;
     appendSet(html: string): void;
-    preload(...htmls: string[]): void;
-    load(...htmls: string[]): void;
-    appendLoad(...htmls: string[]): void;
-    read(...htmls: string[]): string;
+    preload(...urls: string[]): void;
+    load(...urls: string[]): void;
+    appendLoad(...urls: string[]): void;
+    read(...urls: string[]): string;
     clearCache(): void;
     cleanUp(): void;
 }