         let tagObserver = TestedTagObserver(willRenderBlock: { (tag, value) -> Value in
             success = false
             return value
-        }, didRenderBlock: nil)
+            }, didRenderBlock: nil)
         
         let template = Template(string: "---")!
         template.baseContext = template.baseContext.contextByAddingTagObserver(tagObserver)

        XCTAssertEqual(error!.code, 1)
        XCTAssertTrue(failedRendering)
    }
}

        var success = true
        let tagObserver = TestedTagObserver(willRenderBlock: nil, didRenderBlock: { (tag: Tag, rendering: String?, value: Value) in
            success = false
        })
        
        let template = Template(string: "---")!
        template.baseContext = template.baseContext.contextByAddingTagObserver(tagObserver)
