1 files changed, 50 insertions, 0 deletions
diff --git a/spec/ruby/core/rational/plus_spec.rb b/spec/ruby/core/rational/plus_spec.rb
new file mode 100644
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+++ b/spec/ruby/core/rational/plus_spec.rb
@@ -0,0 +1,50 @@
+require_relative "../../spec_helper"
+require_relative 'shared/arithmetic_exception_in_coerce'
+
+describe "Rational#+" do
+  it "calls #coerce on the passed argument with self" do
+    rational = Rational(3, 4)
+    obj = mock("Object")
+    obj.should_receive(:coerce).with(rational).and_return([1, 2])
+
+    rational + obj
+  end
+
+  it "calls #+ on the coerced Rational with the coerced Object" do
+    rational = Rational(3, 4)
+
+    coerced_rational = mock("Coerced Rational")
+    coerced_rational.should_receive(:+).and_return(:result)
+
+    coerced_obj = mock("Coerced Object")
+
+    obj = mock("Object")
+    obj.should_receive(:coerce).and_return([coerced_rational, coerced_obj])
+
+    (rational + obj).should == :result
+  end
+
+  it_behaves_like :rational_arithmetic_exception_in_coerce, :+
+end
+
+describe "Rational#+ with a Rational" do
+  it "returns the result of subtracting other from self as a Rational" do
+    (Rational(3, 4) + Rational(0, 1)).should.eql?(Rational(3, 4))
+    (Rational(3, 4) + Rational(1, 4)).should.eql?(Rational(1, 1))
+
+    (Rational(3, 4) + Rational(2, 1)).should.eql?(Rational(11, 4))
+  end
+end
+describe "Rational#+ with a Float" do
+  it "returns the result of subtracting other from self as a Float" do
+    (Rational(3, 4) + 0.2).should.eql?(0.95)
+    (Rational(3, 4) + 2.5).should.eql?(3.25)
+  end
+end
+
+describe "Rational#+ with an Integer" do
+  it "returns the result of subtracting other from self as a Rational" do
+    (Rational(3, 4) + 1).should.eql?(Rational(7, 4))
+    (Rational(3, 4) + 2).should.eql?(Rational(11, 4))
+  end
+end