1 files changed, 81 insertions, 0 deletions
diff --git a/spec/ruby/library/bigdecimal/comparison_spec.rb b/spec/ruby/library/bigdecimal/comparison_spec.rb
new file mode 100644
index 0000000000..c4de8348b2
--- /dev/null
+++ b/spec/ruby/library/bigdecimal/comparison_spec.rb
@@ -0,0 +1,81 @@
+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")
+    @mixed_big = BigDecimal("1.23456789E100")
+    @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, 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 0 if a == b" do
+    (@pos_int <=> @pos_int).should == 0
+    (@neg_int <=> @neg_int).should == 0
+    (@pos_frac <=> @pos_frac).should == 0
+    (@neg_frac <=> @neg_frac).should == 0
+    (@zero <=> @zero).should == 0
+    (@infinity <=> @infinity).should == 0
+    (@infinity_neg <=> @infinity_neg).should == 0
+  end
+
+  it "returns 1 if a > b" do
+    (@pos_int <=> @neg_int).should == 1
+    (@pos_frac <=> @neg_frac).should == 1
+    (@pos_frac <=> @zero).should == 1
+    @values.each { |val|
+      (@infinity <=> val).should == 1
+    }
+  end
+
+  it "returns -1 if a < b" do
+    (@zero <=> @pos_frac).should == -1
+    (@neg_int <=> @pos_frac).should == -1
+    (@pos_frac <=> @pos_int).should == -1
+    @values.each { |val|
+      (@infinity_neg <=> val).should == -1
+    }
+  end
+
+  it "returns nil if NaN is involved" do
+    @values += [@infinity, @infinity_neg, @nan]
+    @values << nil
+    @values << Object.new
+    @values.each { |val|
+      (@nan <=> val).should == nil
+    }
+  end
+
+  it "returns nil if the argument is nil" do
+    (@zero <=> nil).should == nil
+    (@infinity <=> nil).should == nil
+    (@infinity_neg <=> nil).should == nil
+    (@mixed <=> nil).should == nil
+    (@pos_int <=> nil).should == nil
+    (@neg_frac <=> nil).should == nil
+  end
+end