1 files changed, 45 insertions, 0 deletions
diff --git a/spec/rubyspec/shared/rational/truncate.rb b/spec/rubyspec/shared/rational/truncate.rb
new file mode 100644
index 0000000000..993c654c45
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+++ b/spec/rubyspec/shared/rational/truncate.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe :rational_truncate, shared: true do
+  before do
+    @rational = Rational(2200, 7)
+  end
+
+  describe "with no arguments (precision = 0)" do
+    it "returns an integer" do
+      @rational.truncate.should be_kind_of(Integer)
+    end
+
+    it "returns the truncated value toward 0" do
+      @rational.truncate.should == 314
+      Rational(1, 2).truncate.should == 0
+      Rational(-1, 2).truncate.should == 0
+    end
+  end
+
+  describe "with a precision < 0" do
+    it "returns an integer" do
+      @rational.truncate(-2).should be_kind_of(Integer)
+      @rational.truncate(-1).should be_kind_of(Integer)
+    end
+
+    it "moves the truncation point n decimal places left" do
+      @rational.truncate(-3).should == 0
+      @rational.truncate(-2).should == 300
+      @rational.truncate(-1).should == 310
+    end
+  end
+
+  describe "with a precision > 0" do
+    it "returns a Rational" do
+      @rational.truncate(1).should be_kind_of(Rational)
+      @rational.truncate(2).should be_kind_of(Rational)
+    end
+
+    it "moves the truncation point n decimal places right" do
+      @rational.truncate(1).should == Rational(1571, 5)
+      @rational.truncate(2).should == Rational(7857, 25)
+      @rational.truncate(3).should == Rational(62857, 200)
+    end
+  end
+end