Created
November 3, 2014 14:56
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Custom warn message expectation
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| require 'rspec' | |
| require 'stringio' | |
| # Custom matcher to test message written when warn | |
| # | |
| # Example | |
| # expect { subject.do_something }.to warn('Some error message') | |
| # | |
| # Source | |
| # http://danielchangnyc.github.io/blog/2014/01/15/tdd2-RSpecMatchers/ | |
| RSpec::Matchers.define :warn do |message| | |
| match do |block| | |
| output = get_stderr(&block) | |
| output.include? message | |
| end | |
| # Get STDERR and return the string. | |
| def get_stderr | |
| original_stderr = $stderr | |
| $stderr = StringIO.new | |
| yield | |
| @buffer = $stderr.string | |
| ensure | |
| $stderr = original_stderr | |
| end | |
| description do | |
| %Q[warn #{message.inspect}] | |
| end | |
| def failure_message(to = 'to') | |
| %Q[expected #{to} #{description} but got #{@buffer.inspect}] | |
| end | |
| failure_message_for_should do | |
| failure_message 'to' | |
| end | |
| failure_message_for_should_not do | |
| failure_message 'not to' | |
| end | |
| end |
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