1 files changed, 28 insertions, 0 deletions
diff --git a/spec/ruby/core/float/uminus_spec.rb b/spec/ruby/core/float/uminus_spec.rb
new file mode 100644
index 0000000000..70e2ff0580
--- /dev/null
+++ b/spec/ruby/core/float/uminus_spec.rb
@@ -0,0 +1,28 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Float#-@" do
+  it "negates self" do
+    (2.221.send(:-@)).should be_close(-2.221, TOLERANCE)
+    -2.01.should be_close(-2.01,TOLERANCE)
+    -2_455_999_221.5512.should be_close(-2455999221.5512, TOLERANCE)
+    (--5.5).should be_close(5.5, TOLERANCE)
+    -8.551.send(:-@).should be_close(8.551, TOLERANCE)
+  end
+
+  it "negates self at Float boundaries" do
+    Float::MAX.send(:-@).should be_close(0.0 - Float::MAX, TOLERANCE)
+    Float::MIN.send(:-@).should be_close(0.0 - Float::MIN, TOLERANCE)
+  end
+
+  it "returns negative infinity for positive infinity" do
+    infinity_value.send(:-@).infinite?.should == -1
+  end
+
+  it "returns positive infinity for negative infinity" do
+    (-infinity_value).send(:-@).infinite?.should == 1
+  end
+
+  it "returns NaN for NaN" do
+    nan_value.send(:-@).nan?.should == true
+  end
+end