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-rw-r--r--spec/ruby/core/complex/to_f_spec.rb41
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diff --git a/spec/ruby/core/complex/to_f_spec.rb b/spec/ruby/core/complex/to_f_spec.rb
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+++ b/spec/ruby/core/complex/to_f_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Complex#to_f" do
+ describe "when the imaginary part is Fixnum 0" do
+ it "returns the result of sending #to_f to the real part" do
+ real = mock_numeric('real')
+ real.should_receive(:to_f).and_return(:f)
+ Complex(real, 0).to_f.should == :f
+ end
+ end
+
+ describe "when the imaginary part is Rational 0" do
+ it "returns the result of sending #to_f to the real part" do
+ real = mock_numeric('real')
+ real.should_receive(:to_f).and_return(:f)
+ Complex(real, Rational(0)).to_f.should == :f
+ end
+ end
+
+ describe "when the imaginary part responds to #== 0 with true" do
+ it "returns the result of sending #to_f to the real part" do
+ real = mock_numeric('real')
+ real.should_receive(:to_f).and_return(:f)
+ imag = mock_numeric('imag')
+ imag.should_receive(:==).with(0).any_number_of_times.and_return(true)
+ Complex(real, imag).to_f.should == :f
+ end
+ end
+
+ describe "when the imaginary part is non-zero" do
+ it "raises RangeError" do
+ lambda { Complex(0, 1).to_f }.should raise_error(RangeError)
+ end
+ end
+
+ describe "when the imaginary part is Float 0.0" do
+ it "raises RangeError" do
+ lambda { Complex(0, 0.0).to_f }.should raise_error(RangeError)
+ end
+ end
+end