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, 41 insertions, 0 deletions

diff --git a/spec/rubyspec/core/complex/to_f_spec.rb b/spec/rubyspec/core/complex/to_f_spec.rb
new file mode 100644
index 0000000000..33342e61cc
--- /dev/null
+++ b/spec/rubyspec/core/complex/to_f_spec.rb
@@ -0,0 +1,41 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Complex#to_f" do
+  describe "when the imaginary part is Fixnum 0" do
+    it "returns the result of sending #to_f to the real part" do
+      real = mock_numeric('real')
+      real.should_receive(:to_f).and_return(:f)
+      Complex(real, 0).to_f.should == :f
+    end
+  end
+
+  describe "when the imaginary part is Rational 0" do
+    it "returns the result of sending #to_f to the real part" do
+      real = mock_numeric('real')
+      real.should_receive(:to_f).and_return(:f)
+      Complex(real, Rational(0)).to_f.should == :f
+    end
+  end
+
+  describe "when the imaginary part responds to #== 0 with true" do
+    it "returns the result of sending #to_f to the real part" do
+      real = mock_numeric('real')
+      real.should_receive(:to_f).and_return(:f)
+      imag = mock_numeric('imag')
+      imag.should_receive(:==).with(0).any_number_of_times.and_return(true)
+      Complex(real, imag).to_f.should == :f
+    end
+  end
+
+  describe "when the imaginary part is non-zero" do
+    it "raises RangeError" do
+      lambda { Complex(0, 1).to_f }.should raise_error(RangeError)
+    end
+  end
+
+  describe "when the imaginary part is Float 0.0" do
+    it "raises RangeError" do
+      lambda { Complex(0, 0.0).to_f }.should raise_error(RangeError)
+    end
+  end
+end