require_relative '../../spec_helper' require_relative 'fixtures/classes' describe "Math.cbrt" do it "returns a float" do Math.cbrt(1).should be_an_instance_of(Float) end it "returns the cubic root of the argument" do Math.cbrt(1).should == 1.0 Math.cbrt(8.0).should == 2.0 Math.cbrt(-8.0).should == -2.0 Math.cbrt(3).should be_close(1.44224957030741, TOLERANCE) end it "raises a TypeError if the argument cannot be coerced with Float()" do lambda { Math.cbrt("foobar") }.should raise_error(TypeError) end it "raises a TypeError if the argument is nil" do lambda { Math.cbrt(nil) }.should raise_error(TypeError) end it "accepts any argument that can be coerced with Float()" do Math.cbrt(MathSpecs::Float.new).should be_close(1.0, TOLERANCE) end end