否定assert_difference？
我正在做功能测试，刚刚发现了assert_difference，如：
assert_difference('Account.count') do
post :create, :account => @account.attributes
end
是否有一个对应项，可以检查Account.count是否没有更改？
I am doing functional tests and just discovered assert_difference, as in:
assert_difference('Account.count') do
post :create, :account => @account.attributes
end
Is there a counterpart, which would check if Account.count has not changed?
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来自文档：“断言计算表达式的数值结果是在调用传入块之前和之后没有改变。”
From the docs: "Assertion that the numeric result of evaluating an expression is not changed before and after invoking the passed in block."