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, 87 insertions, 0 deletions

diff --git a/spec/rubyspec/library/bigdecimal/lte_spec.rb b/spec/rubyspec/library/bigdecimal/lte_spec.rb
new file mode 100644
index 0000000000..61fb676245
--- /dev/null
+++ b/spec/rubyspec/library/bigdecimal/lte_spec.rb
@@ -0,0 +1,87 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'bigdecimal'
+
+describe "BigDecimal#<=" do
+  before :each do
+    @zero = BigDecimal("0")
+    @zero_pos = BigDecimal("+0")
+    @zero_neg = BigDecimal("-0")
+    @mixed = BigDecimal("1.23456789")
+    @pos_int = BigDecimal("2E5555")
+    @neg_int = BigDecimal("-2E5555")
+    @pos_frac = BigDecimal("2E-9999")
+    @neg_frac = BigDecimal("-2E-9999")
+
+    @int_mock = mock('123')
+    class << @int_mock
+      def coerce(other)
+        return [other, BigDecimal('123')]
+      end
+      def <= (other)
+        BigDecimal('123') <= other
+      end
+    end
+
+    @values = [@mixed, @pos_int, @neg_int, @pos_frac, @neg_frac,
+      -2**32, -2**31, -2**30, -2**16, -2**8, -100, -10, -1,
+      @zero , 1, 2, 10, 10.5, 2**8, 2**16, 2**32, @int_mock, @zero_pos, @zero_neg]
+
+    @infinity = BigDecimal("Infinity")
+    @infinity_neg = BigDecimal("-Infinity")
+    @nan = BigDecimal("NaN")
+  end
+
+  it "returns true if a <= b" do
+    one = BigDecimal("1")
+    two = BigDecimal("2")
+
+    frac_1 = BigDecimal("1E-99999")
+    frac_2 = BigDecimal("0.9E-99999")
+
+    (@zero <= one).should == true
+    (two <= @zero).should == false
+
+    (frac_2 <= frac_1).should == true
+    (two <= two).should == true
+    (frac_1 <= frac_1).should == true
+
+    (@neg_int <= @pos_int).should == true
+    (@pos_int <= @neg_int).should == false
+    (@neg_int <= @pos_frac).should == true
+    (@pos_frac <= @neg_int).should == false
+    (@zero <= @zero_pos).should == true
+    (@zero <= @zero_neg).should == true
+    (@zero_neg <= @zero_pos).should == true
+    (@zero_pos <= @zero_neg).should == true
+  end
+
+  it "properly handles infinity values" do
+    @values.each { |val|
+      (val <= @infinity).should == true
+      (@infinity <= val).should == false
+      (val <= @infinity_neg).should == false
+      (@infinity_neg <= val).should == true
+    }
+    (@infinity <= @infinity).should == true
+    (@infinity_neg <= @infinity_neg).should == true
+    (@infinity <= @infinity_neg).should == false
+    (@infinity_neg <= @infinity).should == true
+  end
+
+  it "properly handles NaN values" do
+    @values += [@infinity, @infinity_neg, @nan]
+    @values.each { |val|
+      (@nan <= val).should == false
+      (val <= @nan).should == false
+    }
+  end
+
+  it "raises an ArgumentError if the argument can't be coerced into a BigDecimal" do
+    lambda {@zero         <= nil }.should raise_error(ArgumentError)
+    lambda {@infinity     <= nil }.should raise_error(ArgumentError)
+    lambda {@infinity_neg <= nil }.should raise_error(ArgumentError)
+    lambda {@mixed        <= nil }.should raise_error(ArgumentError)
+    lambda {@pos_int      <= nil }.should raise_error(ArgumentError)
+    lambda {@neg_frac     <= nil }.should raise_error(ArgumentError)
+  end
+end