FGified models/garden tests.

Also tweaked slug generation to be lowercase, and avoid spaces in slugs.
This probably needs more work to handle unusual characters, but I
punted on that for now.

app/models/garden.rb

@@ -6,7 +6,8 @@ class Garden < ActiveRecord::Base
   belongs_to :user
 
   def garden_slug
-    "#{user.username}-#{name}"
+    formatted_name = name.downcase.gsub(' ', '-')
+    "#{user.username}-#{formatted_name}"
   end
 
   def owner

spec/models/garden_spec.rb

@@ -2,14 +2,12 @@ require 'spec_helper'
 
 describe Garden do
   before :each do
-    @user = mock_model(User)
-    @user.stub!(:username).and_return("test1")
-    @garden = Garden.new(:name => "my garden")
-    @garden.user = @user
+    @user   = FactoryGirl.create(:user)
+    @garden = FactoryGirl.create(:garden, :user => @user)
   end
 
   it "should have a slug" do
-    @garden.garden_slug.should == "test1-my garden"
+    @garden.garden_slug.should == "user1-my-garden"
   end
 
   it "should have an owner" do