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, 47 insertions, 0 deletions

diff --git a/spec/rubyspec/library/bigdecimal/plus_spec.rb b/spec/rubyspec/library/bigdecimal/plus_spec.rb
new file mode 100644
index 0000000000..72ec282075
--- /dev/null
+++ b/spec/rubyspec/library/bigdecimal/plus_spec.rb
@@ -0,0 +1,47 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'bigdecimal'
+
+describe "BigDecimal#+" do
+
+  before :each do
+    @one = BigDecimal("1")
+    @zero = BigDecimal("0")
+    @two = BigDecimal("2")
+    @three = BigDecimal("3")
+    @ten = BigDecimal("10")
+    @eleven = BigDecimal("11")
+    @nan = BigDecimal("NaN")
+    @infinity = BigDecimal("Infinity")
+    @infinity_minus = BigDecimal("-Infinity")
+    @one_minus = BigDecimal("-1")
+    @frac_1 = BigDecimal("1E-99999")
+    @frac_2 = BigDecimal("0.9E-99999")
+  end
+
+  it "returns a + b" do
+    (@two + @one).should == @three
+    (@one + @two).should == @three
+    (@one + @one_minus).should == @zero
+    (@zero + @one).should == @one
+    (@ten + @one).should == @eleven
+    (@frac_1 + @frac_2).should == BigDecimal("1.9E-99999")
+    (@frac_2 + @frac_1).should == BigDecimal("1.9E-99999")
+    (@frac_1 + @frac_1).should == BigDecimal("2E-99999")
+  end
+
+  it "returns NaN if NaN is involved" do
+    (@one + @nan).nan?.should == true
+    (@nan + @one).nan?.should == true
+  end
+
+  it "returns Infinity or -Infinity if these are involved" do
+    (@zero + @infinity).should == @infinity
+    (@frac_2 + @infinity).should == @infinity
+    (@two + @infinity_minus).should == @infinity_minus
+  end
+
+  it "returns NaN if Infinity + (- Infinity)" do
+    (@infinity + @infinity_minus).nan?.should == true
+  end
+
+end