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, 31 insertions, 0 deletions

diff --git a/spec/rubyspec/core/numeric/uminus_spec.rb b/spec/rubyspec/core/numeric/uminus_spec.rb
new file mode 100644
index 0000000000..7385f5f599
--- /dev/null
+++ b/spec/rubyspec/core/numeric/uminus_spec.rb
@@ -0,0 +1,31 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Numeric#-@" do
+  it "returns the same value with opposite sign (integers)" do
+    0.send(:-@).should == 0
+    100.send(:-@).should == -100
+    -100.send(:-@).should == 100
+  end
+
+  it "returns the same value with opposite sign (floats)" do
+    34.56.send(:-@).should == -34.56
+    -34.56.send(:-@).should == 34.56
+  end
+
+  it "returns the same value with opposite sign (two complement)" do
+    2147483648.send(:-@).should == -2147483648
+    -2147483648.send(:-@).should == 2147483648
+    9223372036854775808.send(:-@).should == -9223372036854775808
+    -9223372036854775808.send(:-@).should == 9223372036854775808
+  end
+
+  describe "with a Numeric subclass" do
+    it "calls #coerce(0) on self, then subtracts the second element of the result from the first" do
+      ten  = mock_numeric('10')
+      zero = mock_numeric('0')
+      ten.should_receive(:coerce).with(0).and_return([zero, ten])
+      zero.should_receive(:-).with(ten).and_return(-10)
+      ten.send(:-@).should == -10
+    end
+  end
+end