为什么我的rspec测试失败？

我的“ POST创建”操作存在问题。当属性有效时，测试成功通过，但是当属性无效时，也会保存播放器。奇怪的是，只有：invalid_player可以保存无效的属性。例如，如果我更改，则获胜为-1或“字符串”，则保存具有属性：invalid_player的玩家。但是，如果我更改：player的属性，例如wins = -1，验证程序将阻止保存玩家。

控制台输出，并显示错误消息：

Failures:

  1) PlayersController user is signed in POST create with invalid attributes does not save the new player
     Failure/Error:
       expect{
         post :create, { tournament_id: @tournament, player: FactoryGirl.attributes_for(:invalid_player) }
       }.to_not change(Player, :count)

       expected #count not to have changed, but did change from 1 to 2
     # ./spec/controllers/players_controller_spec.rb:111:in `block (5 levels) in <top (required)>'

这是我的播放器模型：

class Player < ActiveRecord::Base

  belongs_to :user
  belongs_to :tournament

  validates :wins,  numericality: { only_integer: true, greater_than_or_equal_to: 0 }
  validates :loses, numericality: { only_integer: true, greater_than_or_equal_to: 0 }
  validates :draws, numericality: { only_integer: true, greater_than_or_equal_to: 0 }

end

播放器的出厂文件：

FactoryGirl.define do
  factory :player do
    wins 0
    loses 0
    draws 0

  end

  factory :invalid_player, parent: :player do
    wins -1
    loses 0
    draws 0

  end

end

规格测试：

 context "user is signed in" do

    before do
      @tournament = create(:tournament)
      @player = create(:player)
      @user = create(:user)
      @request.env["devise.mapping"] = Devise.mappings[:user]
      sign_in(@user)
      controller.stub(:current_user).and_return(@user)
    end

    describe "GET new" do
    end

    describe "GET index" do
      it "renders the :index view" do
        get :index, tournament_id: @tournament
        expect(response).to render_template :index
      end
    end

    describe "GET show" do
      it "renders the :show view" do
        get :show, { id: @player, tournament_id: @tournament }
        expect(response).to render_template :show
      end
    end

    describe "POST create" do
      context "with valid attributes" do
        it "creates a new player" do
          expect{
            post :create, { tournament_id: @tournament, player: FactoryGirl.attributes_for(:player) }
          }.to change(Player,:count).by(1)
        end

        it "redirects to the tournament" do
          post :create, { tournament_id: @tournament, player: FactoryGirl.attributes_for(:player) }
          expect(response).to redirect_to @tournament
        end
      end

      context "with invalid attributes" do
        it "does not save the new player" do
          expect{
            post :create, { tournament_id: @tournament, player: FactoryGirl.attributes_for(:invalid_player) }
          }.to_not change(Player, :count)
        end

        it 're-renders the new method' do
          post :create, { tournament_id: @tournament, player: FactoryGirl.attributes_for(:invalid_player) }
          response.should render_template :new
        end
      end
    end

  end

控制器：

class PlayersController < ApplicationController
  before_action :set_tournament
  before_action :set_admin, only: [:edit, :update, :destroy]
  before_action :authenticate_user!, only: [:new, :create, :edit, :update, :destroy]

  def index
    @players = @tournament.players.all
  end

  def show
    @player = Player.find(params[:id])
  end

  def new
    @player = @tournament.players.new
  end

  def create
    if current_user.player.nil? == false
      flash[:error] = "You're already in tournament."
      redirect_to tournaments_url
    else
      @player = @tournament.players.new
      @player.user_id = current_user.id
      if @player.save
        redirect_to @tournament
      else
        render 'new'
      end
    end
  end

  def edit
    if current_user == @admin
      @player = @tournament.players.find(params[:id])
    else
      redirect_to tournaments_url
    end
  end

  def update
    if current_user == @admin
      @player = @tournament.players.find(params[:id])
      if @player.update_attributes(game_params)
        flash[:success] = "Player was updated successful"
        redirect_to @tournament
      end
    else
      redirect_to tournaments_url
    end
  end

  def destroy
    @player = Player.find(params[:id])
    flash[:success] = "Player deleted"
    redirect_to @tournament
  end

  private

  def set_tournament
    @tournament = Tournament.find(params[:tournament_id])
  end

  def set_admin
    @tournament = Tournament.find(params[:tournament_id])
    @admin = @tournament.user
  end
end