1 files changed, 19 insertions, 0 deletions
diff --git a/spec/ruby/core/float/infinite_spec.rb b/spec/ruby/core/float/infinite_spec.rb
new file mode 100644
index 0000000000..901c2738aa
--- /dev/null
+++ b/spec/ruby/core/float/infinite_spec.rb
@@ -0,0 +1,19 @@
+require_relative '../../spec_helper'
+
+describe "Float#infinite?" do
+  it "returns nil for finite values" do
+    1.0.infinite?.should == nil
+  end
+
+  it "returns 1 for positive infinity" do
+    infinity_value.infinite?.should == 1
+  end
+
+  it "returns -1 for negative infinity" do
+    (-infinity_value).infinite?.should == -1
+  end
+
+  it "returns nil for NaN" do
+    nan_value.infinite?.should == nil
+  end
+end