Add tests for filesystem

Ref #120, #121

Author: SpaceK33z

test/FileSystem.test.js

@@ -0,0 +1,29 @@
+var should = require("should");
+var middleware = require("../middleware");
+
+var fakeWebpack = function() {
+	return {
+		watch: function() {
+			return {};
+		},
+		plugin: function() {}
+	};
+};
+
+describe("FileSystem", function() {
+	it("should set outputFileSystem on compiler", function() {
+		var compiler = fakeWebpack();
+		middleware(compiler);
+		should(compiler.outputFileSystem).be.ok();
+	});
+
+	it("should reuse outputFileSystem from compiler", function() {
+		var compiler = fakeWebpack();
+		middleware(compiler);
+		var firstFs = compiler.outputFileSystem;
+		middleware(compiler);
+		var secondFs = compiler.outputFileSystem;
+
+		should.strictEqual(firstFs, secondFs);
+	});
+});