blocks|key|1489056|text|我真的很喜欢Timecop库。您可以在块形式中进行时间扭曲(就像时间扭曲一样)：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1489057|Timecop.travel(6.days.ago)+do
++@model+=+TimeSensitiveMode.new
end
assert+@model.times_up!|code-block|syntax|javascript|1489058|(是的，您可以嵌套块形式的时间旅行。)|1489059|您还可以进行声明式时间旅行：|1489060|class+MyTest+<+Test::Unit::TestCase
++def+setup
++++Timecop.travel(...)
++end
++def+teardown
++++Timecop.return
++end
end|1489061|我为Timecop+here提供了一些cucumber助手。它们可以让你做这样的事情：|1489062|Given+it+is+currently+January+24,+2008
And+I+go+to+the+new+post+page
And+I+fill+in+"title"+with+"An+old+post"
And+I+fill+in+"body"+with+"..."
And+I+press+"Submit"
And+we+jump+in+our+Delorean+and+return+to+the+present
When+I+go+to+the+home+page
I+should+not+see+"An+old+post"|1489063|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/travisjeffery/timecop|1|http://gist.github.com/154616|2|http://wiki.github.com/aslakhellesoy/cucumber^0|6|7|0|0|0|0|0|0|A|4|1|J|8|2|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|F|7|18|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|19|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|1A|8|@]|9|@]|C|$]]|$1|M|3|N|5|F|7|1B|8|@]|9|@]|C|$G|H]]|$1|O|3|P|5|6|7|1C|8|@]|9|@$A|1D|B|1E|1|1F]|$A|1G|B|1H|1|1I]]|C|$]]|$1|Q|3|R|5|F|7|1J|8|@]|9|@]|C|$G|H]]|$1|S|3|-4|5|6|7|1K|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]|10|$5|V|W|X|C|$Y|11]]|12|$5|V|W|X|C|$Y|13]]]]

I really like the <a href="https://github.com/travisjeffery/timecop" rel="noreferrer">Timecop</a> library. You can do time warps in block form (just like time-warp):

<pre><code>Timecop.travel(6.days.ago) do
 @model = TimeSensitiveMode.new
end
assert @model.times_up!
</code></pre>

(Yes, you can nest block-form time travel.)

You can also do declarative time travel:

<pre><code>class MyTest &lt; Test::Unit::TestCase
 def setup
 Timecop.travel(...)
 end
 def teardown
 Timecop.return
 end
end
</code></pre>

I have some <a href="http://wiki.github.com/aslakhellesoy/cucumber" rel="noreferrer">cucumber</a> helpers for Timecop <a href="http://gist.github.com/154616" rel="noreferrer">here</a>. They let you do things like:

<pre><code>Given it is currently January 24, 2008
And I go to the new post page
And I fill in "title" with "An old post"
And I fill in "body" with "..."
And I press "Submit"
And we jump in our Delorean and return to the present
When I go to the home page
I should not see "An old post"
</code></pre>

blocks|key|1488970|text|就我个人而言，我更喜欢让时钟可注入，就像这样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1488971|def+hello(clock=Time)
++puts+"the+time+is+now:+#{clock.now}"
end|code-block|syntax|javascript|1488972|或者：|1488973|class+MyClass
++attr_writer+:clock

++def+initialize
++++@clock+=+Time
++end

++def+hello
++++puts+"the+time+is+now:+#{@clock.now}"
++end
end|1488974|然而，许多人更喜欢使用mocking/stubbing库。在RSpec/flexmock中，您可以使用：|1488975|Time.stub!(:now).and_return(Time.mktime(1970,1,1))|1488976|或者在Mocha中：|1488977|Time.stubs(:now).returns(Time.mktime(1970,1,1))|1488978|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

Personally I prefer to make the clock injectable, like so:

<pre><code>def hello(clock=Time)
 puts "the time is now: #{clock.now}"
end
</code></pre>

Or:

<pre><code>class MyClass
 attr_writer :clock

 def initialize
 @clock = Time
 end

 def hello
 puts "the time is now: #{@clock.now}"
 end
end
</code></pre>

However, many prefer to use a mocking/stubbing library. In RSpec/flexmock you can use:

<pre><code>Time.stub!(:now).and_return(Time.mktime(1970,1,1))
</code></pre>

Or in Mocha:

<pre><code>Time.stubs(:now).returns(Time.mktime(1970,1,1))
</code></pre>

blocks|key|1274679|text|使用Rspec+3.2，我发现伪造Time.now返回值的唯一简单方法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1274680|now+=+Time.parse("1969-07-20+20:17:40")
allow(Time).to+receive(:now)+{+now+}|code-block|syntax|javascript|1274681|现在Time.now将总是返回阿波罗11号登陆月球的日期。|1274682|来源：https://www.relishapp.com/rspec/rspec-mocks/docs|offset|length|1274683|entityMap|0|LINK|mutability|MUTABLE|url|https://www.relishapp.com/rspec/rspec-mocks/docs^0|0|0|0|3|1C|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Using Rspec 3.2, the only simple way I found to fake Time.now return value is :

<pre><code>now = Time.parse("1969-07-20 20:17:40")
allow(Time).to receive(:now) { now }
</code></pre>

Now Time.now will always return the date of Apollo 11 landing on the moon.

Source: <a href="https://www.relishapp.com/rspec/rspec-mocks/docs" rel="nofollow noreferrer">https://www.relishapp.com/rspec/rspec-mocks/docs</a>

blocks|key|1488921|text|执行time-warp|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1488922|time-warp是一个可以做你想做的事情的库。它提供了一个需要时间和块的方法，块中发生的任何事情都使用伪造的时间。|1488923|pretend_now_is(2000,"jan",1,0)+do
++Time.now
end|code-block|syntax|javascript|1488924|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/harvesthq/time-warp^0|2|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Do the <a href="https://github.com/harvesthq/time-warp" rel="nofollow noreferrer">time-warp</a>

time-warp is a library that does what you want. It gives you a method that takes a time and a block and anything that happens in the block uses the faked time.

<pre><code>pretend_now_is(2000,"jan",1,0) do
 Time.now
end
</code></pre>

blocks|key|1274613|text|不要忘记，Time只是一个引用类对象的常量。如果您愿意发出警告，您可以随时这样做|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1274614|real_time_class+=+Time
Time+=+FakeTimeClass
#+run+test
Time+=+real_time_class|code-block|syntax|javascript|1274615|entityMap^0|5|4|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Don't forget that <code>Time</code> is merely a constant that refers to a class object. If you're willing to cause a warning, you can always do

<pre><code>real_time_class = Time
Time = FakeTimeClass
# run test
Time = real_time_class
</code></pre>

blocks|key|1489520|text|如果包含ActiveSupport，则可以使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1489521|travel_to+Time.zone.parse('2010-07-05+08:00')|code-block|syntax|javascript|1489522|http://api.rubyonrails.org/classes/ActiveSupport/Testing/TimeHelpers.html|offset|length|1489523|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|21|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|T|8|@]|9|@$I|U|J|V|1|W]]|A|$]]|$1|K|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|H]]]]

If you have ActiveSupport included, you could use:

<pre><code>travel_to Time.zone.parse('2010-07-05 08:00')
</code></pre>

<a href="http://api.rubyonrails.org/classes/ActiveSupport/Testing/TimeHelpers.html" rel="nofollow noreferrer">http://api.rubyonrails.org/classes/ActiveSupport/Testing/TimeHelpers.html</a>

blocks|key|1274482|text|另请参阅this+question，我在那里也放了这条评论。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1274483|根据您将Time.now与什么进行比较，有时您可以更改您的fixture以实现相同的目标或测试相同的功能。例如，我有一种情况，如果某个日期在未来，我需要发生一件事，如果它发生在过去，我需要另一件事发生。我能够做的是在我的fixture中包含一些嵌入式ruby+(erb)：|style|CODE|1274484|future:
++++comparing_date:+<%25=+Time.now+%2B+10.years+%25>
++++...

past:
++++comparing_date:+<%25=+Time.now+-+10.years+%25>
++++...|code-block|syntax|javascript|1274485|然后，在您的测试中，您可以根据与Time.now相关的时间来选择使用哪个选项来测试不同的功能或操作。|1274486|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/1225708/overriding-time-now-in-ruby-for-testing-purposes/1227209#1227209^0|4|D|0|0|4|8|0|0|G|8|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@$A|11|B|12|F|G]]|9|@]|C|$]]|$1|H|3|I|5|J|7|13|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|14|8|@$A|15|B|16|F|G]]|9|@]|C|$]]|$1|O|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

Also see <a href="https://stackoverflow.com/questions/1225708/overriding-time-now-in-ruby-for-testing-purposes/1227209#1227209">this question</a> where I put this comment as well.

Depending upon what you are comparing <code>Time.now</code> to, sometimes you can change your fixtures to accomplish the same goal or test the same feature. For example, I had a situation where I needed one thing to happen if some date was in the future and another to happen if it was in the past. What I was able to do was include in my fixtures some embedded ruby (erb):

<pre><code>future:
 comparing_date: &lt;%= Time.now + 10.years %&gt;
 ...

past:
 comparing_date: &lt;%= Time.now - 10.years %&gt;
 ...
</code></pre>

Then in your tests then you choose which one to use to test the different features or actions based upon the time relative to <code>Time.now</code>.

blocks|key|1489414|text|也有同样的问题，我不得不为特定日期的规范伪造时间，然后时间就这么做了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1489415|Time.stub!(:now).and_return(Time.mktime(2014,10,22,5,35,28))++++++++|code-block|syntax|javascript|1489416|这将为您提供：|1489417|2014-10-22+05:35:28+-0700|1489418|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Had the same issue, I had to fake time for a spec for a specific day and time just did that:

<pre><code>Time.stub!(:now).and_return(Time.mktime(2014,10,22,5,35,28)) 
</code></pre>

this will give you:

<pre><code>2014-10-22 05:35:28 -0700
</code></pre>

blocks|key|1489153|text|这种方式可以工作并允许嵌套：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1489154|class+Time
++class+<<+self
++++attr_accessor+:stack,+:depth
++end

++def+self.warp(time)

++++Time.stack+%7C%7C=+[]+
++++Time.depth+%7C%7C=+-1+
++++Time.depth+%2B=+1
++++Time.stack.push+time

++++if+Time.depth+==+0+
++++++class+<<+self++++
++++++++++alias_method+:real_now,+:now++
++++++++++alias_method+:real_new,+:new

++++++++++define_method+:now+do
++++++++++++stack[depth]+
++++++++++end

++++++++++define_method+:new+do+
++++++++++++now+
++++++++++end
++++++end+
++++end+

++++yield

++++Time.depth+-=+1
++++Time.stack.pop+

++++class+<<+self+
++++++if+Time.depth+<+0+
++++++++alias_method+:new,+:real_new
++++++++alias_method+:now,+:real_now
++++++++remove_method+:real_new
++++++++remove_method+:real_now+
++++++end
++++end

++end
end|code-block|syntax|javascript|1489155|通过在末尾取消定义堆栈和深度访问器，可以对其进行稍微改进|1489156|用法：|1489157|time1+=+2.days.ago
time2+=+5.months.ago
Time.warp(time1)+do+

++Time.real_now.should_not+==+Time.now

++Time.now.should+==+time1+
++Time.warp(time2)+do+
++++Time.now.should+==+time2
++end+
++Time.now.should+==+time1
end

Time.now.should_not+==+time1+
Time.now.should_not+be_nil|1489158|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This kind of works and allows for nesting: 

<pre><code>class Time
 class &lt;&lt; self
 attr_accessor :stack, :depth
 end

 def self.warp(time)

 Time.stack ||= [] 
 Time.depth ||= -1 
 Time.depth += 1
 Time.stack.push time

 if Time.depth == 0 
 class &lt;&lt; self 
 alias_method :real_now, :now 
 alias_method :real_new, :new

 define_method :now do
 stack[depth] 
 end

 define_method :new do 
 now 
 end
 end 
 end 

 yield

 Time.depth -= 1
 Time.stack.pop 

 class &lt;&lt; self 
 if Time.depth &lt; 0 
 alias_method :new, :real_new
 alias_method :now, :real_now
 remove_method :real_new
 remove_method :real_now 
 end
 end

 end
end
</code></pre>

It could be slightly improved by undefing the stack and depth accessors at the end

Usage: 

<pre><code>time1 = 2.days.ago
time2 = 5.months.ago
Time.warp(time1) do 

 Time.real_now.should_not == Time.now

 Time.now.should == time1 
 Time.warp(time2) do 
 Time.now.should == time2
 end 
 Time.now.should == time1
end

Time.now.should_not == time1 
Time.now.should_not be_nil
</code></pre>

blocks|key|1274444|text|根据您将Time.now与什么进行比较，有时您可以更改您的fixture以实现相同的目标或测试相同的功能。例如，我有一种情况，如果某个日期在未来，我需要发生一件事，如果它发生在过去，我需要另一件事发生。我能够做的是在我的fixture中包含一些嵌入式ruby+(erb)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1274445|future:
++++comparing_date:+<%25=+Time.now+%2B+10.years+%25>
++++...

past:
++++comparing_date:+<%25=+Time.now+-+10.years+%25>
++++...|code-block|syntax|javascript|1274446|然后，在您的测试中，您可以根据与Time.now相关的时间来选择使用哪个选项来测试不同的功能或操作。|1274447|entityMap^0|4|8|0|0|G|8|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

Depending upon what you are comparing <code>Time.now</code> to, sometimes you can change your fixtures to accomplish the same goal or test the same feature. For example, I had a situation where I needed one thing to happen if some date was in the future and another to happen if it was in the past. What I was able to do was include in my fixtures some embedded ruby (erb):

<pre><code>future:
 comparing_date: &lt;%= Time.now + 10.years %&gt;
 ...

past:
 comparing_date: &lt;%= Time.now - 10.years %&gt;
 ...
</code></pre>

Then in your tests then you choose which one to use to test the different features or actions based upon the time relative to <code>Time.now</code>.

blocks|key|1274536|text|我只是在我的测试文件中有这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1274537|+++def+time_right_now
++++++current_time+=+Time.parse("07/09/10+14:20")
++++++current_time+=+convert_time_to_utc(current_date)
++++++return+current_time
++++end|code-block|syntax|javascript|1274538|在我的Time_helper.rb文件中，我有一个|1274539|++def+time_right_now
++++current_time=+Time.new
++++return+current_time
++end|1274540|因此，在测试时，time_right_now会被覆盖，以使用您想要的任何时间。|1274541|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

i just have this in my test file:

<pre><code> def time_right_now
 current_time = Time.parse("07/09/10 14:20")
 current_time = convert_time_to_utc(current_date)
 return current_time
 end
</code></pre>

and in my Time_helper.rb file i have a 

<pre><code> def time_right_now
 current_time= Time.new
 return current_time
 end
</code></pre>

so when testing the time_right_now is overwritten to use what ever time you want it to be.

blocks|key|1274576|text|我总是将Time.now提取到一个单独的方法中，然后在模拟中转换为attr_accessor。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1274577|entityMap^0|4|8|X|D|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

I allways extract <code>Time.now</code> into a separate method that I turn into <code>attr_accessor</code> in the mock.

blocks|key|1274757|text|我自己的解决方案https://github.com/igorkasyanchuk/rails_time_travel+-一个带有UI的gem，所以你不需要在代码中硬编码任何datetime。只需在UI中更改即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1274758|它也可能对你的QA团队非常有用，或者在测试中测试应用程序。|1274759|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/igorkasyanchuk/rails_time_travel^0|8|1F|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

My own solution <a href="https://github.com/igorkasyanchuk/rails_time_travel" rel="nofollow noreferrer">https://github.com/igorkasyanchuk/rails_time_travel</a> - a gem with UI, so you don't need to hardcode any datetime in the code. Just change it from the UI.
It might be also very useful for you QA's team, or testing app on the staging.

What's the best way to set <code>Time.now</code> for the purpose of testing time-sensitive methods in a unit test?

How to fake Time.now?

单元测试

为了在单元测试中测试时间敏感的方法，设置Time.now的最佳方法是什么？

问如何伪造Time.now？
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回答 13

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问如何伪造Time.now？
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