diff options
Diffstat (limited to 'spec/ruby/core/math/cbrt_spec.rb')
| -rw-r--r-- | spec/ruby/core/math/cbrt_spec.rb | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/spec/ruby/core/math/cbrt_spec.rb b/spec/ruby/core/math/cbrt_spec.rb new file mode 100644 index 0000000000..0b608151ab --- /dev/null +++ b/spec/ruby/core/math/cbrt_spec.rb @@ -0,0 +1,27 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +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 |