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Would be awesome to use proc as a message #120

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Would be awesome to use proc as a message #120

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4 changes: 4 additions & 0 deletions lib/rspec/expectations/fail_with.rb
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Expand Up @@ -19,6 +19,10 @@ def fail_with(message, expected=nil, actual=nil)
"appropriate failure_message_for_* method to return a string?"
end

if message.is_a? Proc
message = message.call
end

if actual && expected
if all_strings?(actual, expected)
if any_multiline_strings?(actual, expected)
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6 changes: 6 additions & 0 deletions spec/rspec/expectations/fail_with_spec.rb
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Expand Up @@ -66,5 +66,11 @@
RSpec::Expectations.fail_with "the message", lambda {}, lambda {}
}.should fail_with("the message")
end

it "accept message as Proc" do
lambda {
RSpec::Expectations.fail_with lambda { "the message"}
}.should fail_with("the message")
end
end