1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/core/rational/rationalize_spec.rb b/spec/ruby/core/rational/rationalize_spec.rb
new file mode 100644
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+++ b/spec/ruby/core/rational/rationalize_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Rational#rationalize" do
+  it "returns self with no argument" do
+    Rational(12,3).rationalize.should == Rational(12,3)
+    Rational(-45,7).rationalize.should == Rational(-45,7)
+  end
+
+  # FIXME: These specs need reviewing by somebody familiar with the
+  # algorithm used by #rationalize
+  it "simplifies self to the degree specified by a Rational argument" do
+    r = Rational(5404319552844595,18014398509481984)
+    r.rationalize(Rational(1,10)).should == Rational(1,3)
+    r.rationalize(Rational(-1,10)).should == Rational(1,3)
+
+    r = Rational(-5404319552844595,18014398509481984)
+    r.rationalize(Rational(1,10)).should == Rational(-1,3)
+    r.rationalize(Rational(-1,10)).should == Rational(-1,3)
+
+  end
+
+  it "simplifies self to the degree specified by a Float argument" do
+    r = Rational(5404319552844595,18014398509481984)
+    r.rationalize(0.05).should == Rational(1,3)
+    r.rationalize(0.001).should == Rational(3, 10)
+
+    r = Rational(-5404319552844595,18014398509481984)
+    r.rationalize(0.05).should == Rational(-1,3)
+    r.rationalize(0.001).should == Rational(-3,10)
+  end
+
+  it "raises ArgumentError when passed more than one argument" do
+    lambda { Rational(1,1).rationalize(0.1, 0.1) }.should raise_error(ArgumentError)
+    lambda { Rational(1,1).rationalize(0.1, 0.1, 2) }.should raise_error(ArgumentError)
+  end
+end