添加对user和project的model测试

app/models/project.rb

@@ -1,3 +1,14 @@
 class Project < ActiveRecord::Base
   has_and_belongs_to_many :users
+
+  validate :require_at_least_on_user  # 项目中最少要有一个用户
+  validates :name, presence: true, length: { minimum: 1, maximum: 50 }, uniqueness: true
+
+  private
+
+    def  require_at_least_on_user
+      if !users || users.size == 0  # 这里使用size，可以智能选择需不需要查询数据库
+        errors[:users] = 'at least one user in the project'
+      end
+    end
 end

app/models/user.rb

@@ -6,7 +6,7 @@ class User < ActiveRecord::Base
 
   has_secure_password  # 等价于验证password_confirm和password是否相等，并且验证password是否存在
 
-  validates :name, presence: true, uniqueness: true, length: { maximum: 20 }
+  validates :name, presence: true, uniqueness: true, length: { maximum: 30 }
   validates :email, presence: true, uniqueness: true, length: { maximum: 50},
            format: { with: /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i }
   validates :password, length: { minimum: 6 }

spec/factories/factory_helper.rb

@@ -0,0 +1,3 @@
+def generateRandomString(min_len, max_len)
+  Faker::Internet.password(min_len, max_len)
+end

spec/factories/projects.rb

@@ -0,0 +1,14 @@
+FactoryGirl.define do
+  factory :project do
+    name { Faker::Name.title }
+    sequence(:content){ |n| "This is project content#{n}"}
+
+    after(:build) do |project|
+      3.times { project.users << FactoryGirl.create(:user_with_sequence_number) }
+    end
+
+    factory :project_name_length_gt_20 do
+      name { generateRandomString(51, 51)}
+    end
+  end
+end

spec/factories/users.rb

@@ -10,8 +10,8 @@ FactoryGirl.define do
       sequence(:name){ |n| "username#{n}"}
     end
 
-    factory :user_name_length_gt_20 do
-      name '12345678901234567890xxxx'
+    factory :user_name_length_gt_30 do
+      name generateRandomString(31, 31)
     end
 
     factory :user_email_length_gt_50 do

spec/models/project_spec.rb

@@ -0,0 +1,32 @@
+require 'rails_helper'
+
+RSpec.describe Project, type: :model do
+
+  it 'has a valid factory' do
+    expect(build(:project)).to be_valid
+  end
+
+  describe 'users test' do
+    it 'has at least on user' do
+      project_with_no_user = build(:project)
+      project_with_no_user.users = []
+      project_with_no_user.valid?
+      expect(project_with_no_user.errors[:users].size).to eq(1)
+    end
+  end
+
+  describe  'name test' do
+    it 'does not allow absence of name' do
+      expect(build(:project, name: nil)).to_not be_valid
+    end
+
+    it 'length of name in [1,20]' do
+      expect(build(:project_name_length_gt_20)).to_not be_valid
+    end
+
+    it 'does not allow duplicate name' do
+      create(:project, name: 'project1')
+      expect(build(:project, name: 'project1')).to_not be_valid
+    end
+  end
+end

spec/models/user_spec.rb

@@ -18,8 +18,8 @@ RSpec.describe User, type: :model do
       expect(user_duplicated_name.errors[:name].size).to eq(1)
     end
 
-    it 'does not allow name length > 20' do
-      expect(build(:user_name_length_gt_20)).not_to be_valid
+    it 'does not allow name length > 30' do
+      expect(build(:user_name_length_gt_30)).not_to be_valid
     end
   end
 

spec/rails_helper.rb

@@ -5,6 +5,7 @@ require File.expand_path('../../config/environment', __FILE__)
 abort("The Rails environment is running in production mode!") if Rails.env.production?
 require 'spec_helper'
 require 'rspec/rails'
+require 'factories/factory_helper'  # 添加预固件辅助器
 # Add additional requires below this line. Rails is not loaded until this point!
 
 # Requires supporting ruby files with custom matchers and macros, etc, in