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myronmarston/raise_error_spec.rb

Created April 10, 2015 16:58
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Demonstration of using matcher for the first argument to `raise_error`
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raise_error_spec.rb
RSpec::Matchers.define :an_exception_caused_by do |cause|
match do |exception|
cause === exception.cause
end
end
expect {
begin
"foo".gsub # requires 2 args
rescue ArgumentError
raise "failed to gsub"
end
}.to raise_error( an_exception_caused_by(ArgumentError) )
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