Use mock_model outside of Rails

I want to use RSpec's mock_model outside of Rails, but only found this mail thread.

Actually it is not hard to use mock_model without rails. You need to install rspec-rails, and active_record gem first. Here is an example,

require 'active_support/core_ext/hash'
require 'spec/rails/mocks'
include Spec::Rails::Mocks

class TestTable
end

class View
def initialize(table)
  @table = table
end

def print_keys
  "name is #{@table.name} #{@table.class.primary_keys.join(",")}"
end

def print_name
  "name is #{@table.name}"
end
end

describe "TestTable" do
before do
  table = mock_model(TestTable, :name=>"table_abc")
  @view = View.new(table)
end

it "should fail the expectation check" do
  TestTable.should_receive(:primary_keys).and_return(["pk1", "pk2"])
  @view.print_keys.should == "name is table_abc"
end

it "should complain that no primary_keys is called" do
  TestTable.should_receive(:primary_keys).and_return(["pk1", "pk2"])
  @view.print_name.should == "name is table_abc"
end

it "should print the table name" do
  @view.print_name.should == "name is table_abc"
end

it "should print the table name and keys" do
  TestTable.should_receive(:primary_keys).and_return(["pk1", "pk2"])
  @view.print_keys.should == "name is table_abc pk1,pk2"
end
end