diff --git a/test/unit/coffee/ResourceWriterTests.coffee b/test/unit/coffee/ResourceWriterTests.coffee
index efaf36a..d4dd9c1 100644
--- a/test/unit/coffee/ResourceWriterTests.coffee
+++ b/test/unit/coffee/ResourceWriterTests.coffee
@@ -7,7 +7,9 @@ path = require "path"
 describe "ResourceWriter", ->
 	beforeEach ->
 		@ResourceWriter = SandboxedModule.require modulePath, requires:
-			"fs": @fs = { mkdir: sinon.stub().callsArg(1) }
+			"fs": @fs =
+				mkdir: sinon.stub().callsArg(1)
+				unlink: sinon.stub().callsArg(1)
 			"wrench": @wrench = {}
 			"./UrlCache" : @UrlCache = {}
 			"mkdirp" : @mkdirp = sinon.stub().callsArg(1)