1 files changed, 30 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/uminus_spec.rb b/spec/ruby/core/integer/uminus_spec.rb
new file mode 100644
index 0000000000..7a9cfe89bf
--- /dev/null
+++ b/spec/ruby/core/integer/uminus_spec.rb
@@ -0,0 +1,30 @@
+require_relative '../../spec_helper'
+
+describe "Integer#-@" do
+  context "fixnum" do
+    it "returns self as a negative value" do
+      2.send(:-@).should == -2
+      -2.should == -2
+      -268435455.should == -268435455
+      (--5).should == 5
+      -8.send(:-@).should == 8
+    end
+
+    it "negates self at Fixnum/Bignum boundaries" do
+      (-fixnum_max).should == (0 - fixnum_max)
+      (-fixnum_max).should < 0
+      (-fixnum_min).should == (0 - fixnum_min)
+      (-fixnum_min).should > 0
+    end
+  end
+
+  context "bignum" do
+    it "returns self as a negative value" do
+      bignum_value.send(:-@).should == -18446744073709551616
+      (-bignum_value).send(:-@).should == 18446744073709551616
+
+      bignum_value(921).send(:-@).should == -18446744073709552537
+      (-bignum_value(921).send(:-@)).should == 18446744073709552537
+    end
+  end
+end