:if and :unless conditions on ActiveRecord validations

[sha1sum]

:if and :unless conditions on ActiveRecord validations now create "context" blocks and mock the boolean response as long as the if condition is a symbol.

Resolves #10

[sha1sum]

This creates something similar to the following for :unless conditions (without the comments):

  context "with conditions" do
    # given "validates :termination_date, presence: true, unless: :third_party?"
    before do
      allow(subject).to receive(:third_party?).and_return(false)
    end

    it { is_expected.to validate_presence_of :termination_date }
  end

... and the following for :if conditions:

  context "with conditions" do
    # given "validates :manager_id, presence: true, if: :third_party?"
    before do
      allow(subject).to receive(:third_party?).and_return(true)
    end

    it { is_expected.to validate_presence_of :manager_id }
  end

[erwinjunker]

Awesome! I will merge this pull request and ad it to the next version 0.5.9 for rubygems which i plan to release next week. I will play with this a little bit today.

Thanks :)