1 files changed, 39 insertions, 0 deletions
diff --git a/spec/ruby/core/float/numerator_spec.rb b/spec/ruby/core/float/numerator_spec.rb
new file mode 100644
index 0000000000..9644d01c23
--- /dev/null
+++ b/spec/ruby/core/float/numerator_spec.rb
@@ -0,0 +1,39 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Float#numerator" do
+  before :all do
+    @numbers = [
+      29871.2722891,
+      999.1**99.928888,
+      -72628191273.22,
+      29282.2827,
+      -2927.00091,
+      12.0,
+      Float::MAX,
+    ]
+  end
+
+  it "converts self to a Rational object then returns its numerator" do
+    @numbers.each do |number|
+      number.infinite?.should be_nil
+      number.numerator.should == Rational(number).numerator
+    end
+  end
+
+  it "returns 0 for 0.0" do
+    0.0.numerator.should == 0
+  end
+
+  it "returns NaN for NaN" do
+    nan_value.numerator.nan?.should be_true
+  end
+
+  it "returns Infinity for Infinity" do
+    infinity_value.numerator.infinite?.should == 1
+  end
+
+  it "returns -Infinity for -Infinity" do
+    (-infinity_value).numerator.infinite?.should == -1
+  end
+
+end