diff options
Diffstat (limited to 'spec/ruby/core/io/try_convert_spec.rb')
-rw-r--r-- | spec/ruby/core/io/try_convert_spec.rb | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/spec/ruby/core/io/try_convert_spec.rb b/spec/ruby/core/io/try_convert_spec.rb new file mode 100644 index 0000000000..0326982ff1 --- /dev/null +++ b/spec/ruby/core/io/try_convert_spec.rb @@ -0,0 +1,49 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +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") + lambda { 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) + lambda{ IO.try_convert(obj) }.should raise_error(TypeError) + end +end |