[Rails] Is flash[] value kept through action to action in integration tests?

I have an integration test that sets a flash[] value in action before
redirect and reads it in the next action (the one that previous action
redirects to):

test("some integration test") do
get("/one")
assert_equal(true, flash[:foo]) ## is set to true in this action
assert_response(:redirect)

follow_redirect!

assert_equal(true, flash[:foo]) ## has to be true in next action
end

So flash[:foo] has to be "true" in the second action. Because it is set
in the first one. But my test throws an error:

1) Failure:
<true> expected but was <nil>.

My question is, are flash values kept in integration test? Does it have
to be "true" here or the above behavior is correct?

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