[Rails] Testing a helper that uses content_for

Hey guys, I'm having trouble testing a helper that uses content_for. I am using test::unit and hitting a road block. below is my code and below that is the error I am hitting. Any help would be much appreciated.

Matt

-- my helper def --
def page_title(title)
content_for(:title) { "#{title} | my title" }
end


-- my test --
test "displays page title" do
assert_equal "my test | my title", page_title("my test")
end

NoMethodError: undefined method `append' for nil:NilClass

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