require_relative '../../../spec_helper'

require 'random/formatter'

describe "Random::Formatter#alphanumeric" do
  before :each do
    @object = Object.new
    @object.extend(Random::Formatter)
    @object.define_singleton_method(:bytes) do |n|
      "\x00".b * n
    end
  end

  it "generates a random alphanumeric string" do
    @object.alphanumeric.should =~ /\A[A-Za-z0-9]+\z/
  end

  it "has a default size of 16 characters" do
    @object.alphanumeric.size.should == 16
  end

  it "accepts a 'size' argument" do
    @object.alphanumeric(10).size.should == 10
  end

  it "uses the default size if 'nil' is given as size argument" do
    @object.alphanumeric(nil).size.should == 16
  end

  it "raises an ArgumentError if the size is not numeric" do
    -> {
      @object.alphanumeric("10")
    }.should.raise(ArgumentError)
  end

  it "does not coerce the size argument with #to_int" do
    size = mock("size")
    size.should_not_receive(:to_int)
    -> {
      @object.alphanumeric(size)
    }.should.raise(ArgumentError)
  end

  it "accepts a 'chars' argument with the output alphabet" do
    @object.alphanumeric(chars: ['a', 'b']).should =~ /\A[ab]+\z/
  end

  it "converts the elements of chars using #to_s" do
    to_s = mock("to_s")
    to_s.should_receive(:to_s).and_return("[mock to_s]")
    # Using 1 value in chars results in an infinite loop
    @object.alphanumeric(1, chars: [to_s, to_s]).should == "[mock to_s]"
  end
end
