ruby--ruby/spec/ruby/core/integer/digits_spec.rb

require File.expand_path('../../../spec_helper', __FILE__)

ruby_version_is "2.4" do
  describe "Integer#digits" do
    it "returns an array of place values in base-10 by default" do
      12345.digits.should == [5,4,3,2,1]
    end

    it "returns digits by place value of a given radix" do
      12345.digits(7).should == [4,6,6,0,5]
    end

    it "converts the radix with #to_int" do
      12345.digits(mock_int(2)).should == [1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1]
    end

    it "returns [0] when called on 0, regardless of base" do
      0.digits.should == [0]
      0.digits(7).should == [0]
    end

    it "raises ArgumentError when calling with a radix less than 2" do
      lambda { 12345.digits(1) }.should raise_error(ArgumentError)
    end

    it "raises ArgumentError when calling with a negative radix" do
      lambda { 12345.digits(-2) }.should raise_error(ArgumentError)
    end

    it "raises Math::DomainError when calling digits on a negative number" do
      lambda { -12345.digits(7) }.should raise_error(Math::DomainError)
    end
  end
end