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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "IO.try_convert" do
before :each do
@name = tmp("io_try_convert.txt")
@io = new_io @name
end
after :each do
@io.close unless @io.closed?
rm_r @name
end
it "returns the passed IO object" do
IO.try_convert(@io).should equal(@io)
end
it "does not call #to_io on an IO instance" do
@io.should_not_receive(:to_io)
IO.try_convert(@io)
end
it "calls #to_io to coerce an object" do
obj = mock("io")
obj.should_receive(:to_io).and_return(@io)
IO.try_convert(obj).should equal(@io)
end
it "returns nil when the passed object does not respond to #to_io" do
IO.try_convert(mock("io")).should be_nil
end
it "return nil when BasicObject is passed" do
IO.try_convert(BasicObject.new).should be_nil
end
it "raises a TypeError if the object does not return an IO from #to_io" do
obj = mock("io")
obj.should_receive(:to_io).and_return("io")
-> { IO.try_convert(obj) }.should raise_error(TypeError)
end
it "propagates an exception raised by #to_io" do
obj = mock("io")
obj.should_receive(:to_io).and_raise(TypeError.new)
->{ IO.try_convert(obj) }.should raise_error(TypeError)
end
end
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