1 files changed, 39 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/rationalize_spec.rb b/spec/ruby/core/integer/rationalize_spec.rb
new file mode 100644
index 0000000000..1ff4cfa454
--- /dev/null
+++ b/spec/ruby/core/integer/rationalize_spec.rb
@@ -0,0 +1,39 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Integer#rationalize" do
+  before :all do
+    @numbers = [
+      0,
+      29871,
+      99999999999999**99,
+      -72628191273,
+    ]
+  end
+
+  it "returns a Rational object" do
+    @numbers.each do |number|
+      number.rationalize.should be_an_instance_of(Rational)
+    end
+  end
+
+  it "uses self as the numerator" do
+    @numbers.each do |number|
+      number.rationalize.numerator.should == number
+    end
+  end
+
+  it "uses 1 as the denominator" do
+    @numbers.each do |number|
+      number.rationalize.denominator.should == 1
+    end
+  end
+
+  it "ignores a single argument" do
+    1.rationalize(0.1).should == Rational(1,1)
+  end
+
+  it "raises ArgumentError when passed more than one argument" do
+    lambda { 1.rationalize(0.1, 0.1) }.should raise_error(ArgumentError)
+    lambda { 1.rationalize(0.1, 0.1, 2) }.should raise_error(ArgumentError)
+  end
+end