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

require_relative '../../spec_helper'

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
    -> { 12345.digits(1) }.should raise_error(ArgumentError)
  end

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

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

  it "returns integer values > 9 when base is above 10" do
    1234.digits(16).should == [2, 13, 4]
  end

  it "can be used with base > 37" do
    1234.digits(100).should == [34, 12]
    980099.digits(100).should == [99, 0, 98]
  end
end