require 'spec_helper'

describe 'transactions (multi/exec/discard)' do
  before(:each) do
    @redises.discard rescue nil
  end

  context "#multi" do
    it "responds with 'OK'" do
      @redises.multi.should == 'OK'
    end

    it "forbids nesting" do
      @redises.multi
      lambda do
        @redises.multi
      end.should raise_error(RuntimeError)
    end
  end

  context "#blocks" do
    it "implicitly runs exec when finished" do
      @redises.set("counter", 5)
      @redises.multi do |r|
        r.set("test", 1)
        r.incr("counter")
      end
      @redises.get("counter").should == "6"
      @redises.get("test").should == "1"
    end

    it "forbids nesting via blocks" do
      # Have to use only the mock here. redis-rb has a bug in it where
      # nested #multi calls raise NoMethodError because it gets a nil
      # where it's not expecting one.
      @redises.mock.multi do |r|
        lambda do
          r.multi {}
        end.should raise_error(RuntimeError)
      end
    end
  end

  context "#discard" do
    it "responds with 'OK' after #multi" do
      @redises.multi
      @redises.discard.should == 'OK'
    end

    it "can't be run outside of #multi/#exec" do
      lambda do
        @redises.discard
      end.should raise_error(RuntimeError)
    end
  end

  context "#exec" do
    it "raises an error outside of #multi" do
      lambda do
        @redises.exec.should raise_error
      end
    end
  end

  context "saving up commands for later" do
    before(:each) do
      @redises.multi
      @string = 'mock-redis-test:string'
      @list = 'mock-redis-test:list'
    end

    it "makes commands respond with 'QUEUED'" do
      @redises.set(@string, 'string').should == 'QUEUED'
      @redises.lpush(@list, 'list').should == 'QUEUED'
    end

    it "gives you the commands' responses when you call #exec" do
      @redises.set(@string, 'string')
      @redises.lpush(@list, 'list')
      @redises.lpush(@list, 'list')

      @redises.exec.should == ['OK', 1, 2]
    end

    it "does not raise exceptions, but rather puts them in #exec's response" do
      @redises.set(@string, 'string')
      @redises.lpush(@string, 'oops!')
      @redises.lpush(@list, 'list')

      responses = @redises.exec
      responses[0].should == 'OK'
      responses[1].should be_a(RuntimeError)
      responses[2].should == 1
    end
  end
end