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Diffstat (limited to 'spec/ruby/core/string/try_convert_spec.rb')
-rw-r--r-- | spec/ruby/core/string/try_convert_spec.rb | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/spec/ruby/core/string/try_convert_spec.rb b/spec/ruby/core/string/try_convert_spec.rb new file mode 100644 index 0000000000..ce12839c59 --- /dev/null +++ b/spec/ruby/core/string/try_convert_spec.rb @@ -0,0 +1,50 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "String.try_convert" do + it "returns the argument if it's a String" do + x = String.new + String.try_convert(x).should equal(x) + end + + it "returns the argument if it's a kind of String" do + x = StringSpecs::MyString.new + String.try_convert(x).should equal(x) + end + + it "returns nil when the argument does not respond to #to_str" do + String.try_convert(Object.new).should be_nil + end + + it "sends #to_str to the argument and returns the result if it's nil" do + obj = mock("to_str") + obj.should_receive(:to_str).and_return(nil) + String.try_convert(obj).should be_nil + end + + it "sends #to_str to the argument and returns the result if it's a String" do + x = String.new + obj = mock("to_str") + obj.should_receive(:to_str).and_return(x) + String.try_convert(obj).should equal(x) + end + + it "sends #to_str to the argument and returns the result if it's a kind of String" do + x = StringSpecs::MyString.new + obj = mock("to_str") + obj.should_receive(:to_str).and_return(x) + String.try_convert(obj).should equal(x) + end + + it "sends #to_str to the argument and raises TypeError if it's not a kind of String" do + obj = mock("to_str") + obj.should_receive(:to_str).and_return(Object.new) + lambda { String.try_convert obj }.should raise_error(TypeError) + end + + it "does not rescue exceptions raised by #to_str" do + obj = mock("to_str") + obj.should_receive(:to_str).and_raise(RuntimeError) + lambda { String.try_convert obj }.should raise_error(RuntimeError) + end +end |