Add in-tree mspec and ruby/spec

* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 50 insertions, 0 deletions

diff --git a/spec/rubyspec/core/string/try_convert_spec.rb b/spec/rubyspec/core/string/try_convert_spec.rb
new file mode 100644
index 0000000000..ce12839c59
--- /dev/null
+++ b/spec/rubyspec/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