Refactor the gravatar email changes to use webmock stubbing

The main reason for doing this is to make the tests easier to read,
rather than having to look up both the gravatar fixture, and then
correlate that with the users fixture. Putting the expected response
code in the tests is much more explicit.

test/controllers/user_controller_test.rb

@@ -5,7 +5,6 @@ class UserControllerTest < ActionController::TestCase
 
   setup do
     stub_request(:get, "http://api.hostip.info/country.php?ip=0.0.0.0")
-    stub_request(:get, /.*gravatar.com.*d=404/).to_return(:status => 404)
   end
 
   ##
@@ -397,6 +396,7 @@ class UserControllerTest < ActionController::TestCase
 
   def test_confirm_success_no_token_no_referer
     user = users(:inactive_user)
+    stub_gravatar_request(user.email)
     confirm_string = user.tokens.create.token
 
     @request.cookies["_osm_session"] = user.display_name
@@ -407,6 +407,7 @@ class UserControllerTest < ActionController::TestCase
 
   def test_confirm_success_good_token_no_referer
     user = users(:inactive_user)
+    stub_gravatar_request(user.email)
     confirm_string = user.tokens.create.token
     token = user.tokens.create.token
 
@@ -417,6 +418,7 @@ class UserControllerTest < ActionController::TestCase
 
   def test_confirm_success_bad_token_no_referer
     user = users(:inactive_user)
+    stub_gravatar_request(user.email)
     confirm_string = user.tokens.create.token
     token = users(:normal_user).tokens.create.token
 
@@ -428,6 +430,7 @@ class UserControllerTest < ActionController::TestCase
 
   def test_confirm_success_no_token_with_referer
     user = users(:inactive_user)
+    stub_gravatar_request(user.email)
     confirm_string = user.tokens.create(:referer => diary_new_path).token
 
     @request.cookies["_osm_session"] = user.display_name
@@ -438,6 +441,7 @@ class UserControllerTest < ActionController::TestCase
 
   def test_confirm_success_good_token_with_referer
     user = users(:inactive_user)
+    stub_gravatar_request(user.email)
     confirm_string = user.tokens.create(:referer => diary_new_path).token
     token = user.tokens.create.token
 
@@ -448,6 +452,7 @@ class UserControllerTest < ActionController::TestCase
 
   def test_confirm_success_bad_token_with_referer
     user = users(:inactive_user)
+    stub_gravatar_request(user.email)
     confirm_string = user.tokens.create(:referer => diary_new_path).token
     token = users(:normal_user).tokens.create.token
 
@@ -526,6 +531,7 @@ class UserControllerTest < ActionController::TestCase
 
   def test_confirm_email_success
     user = users(:second_public_user)
+    stub_gravatar_request(user.new_email)
     confirm_string = user.tokens.create.token
 
     post :confirm_email, :confirm_string => confirm_string
@@ -556,35 +562,33 @@ class UserControllerTest < ActionController::TestCase
   # this happens when the email is actually changed
   # which is triggered by the confirmation mail
   def test_gravatar_auto_enable
-    with_http_stubs "gravatar" do
-      # switch to email that has a gravatar
-      user = users(:first_gravatar_user)
-      confirm_string = user.tokens.create.token
-      # precondition gravatar should be turned off
-      assert !user.image_use_gravatar
-      post :confirm_email, :confirm_string => confirm_string
-      assert_response :redirect
-      assert_redirected_to :action => :account, :display_name => user.display_name
-      assert_match /Confirmed your change of email address/, flash[:notice]
-      # gravatar use should now be enabled
-      assert User.find(users(:first_gravatar_user).id).image_use_gravatar
-    end
+    # switch to email that has a gravatar
+    user = users(:first_gravatar_user)
+    stub_gravatar_request(user.new_email, 200)
+    confirm_string = user.tokens.create.token
+    # precondition gravatar should be turned off
+    assert !user.image_use_gravatar
+    post :confirm_email, :confirm_string => confirm_string
+    assert_response :redirect
+    assert_redirected_to :action => :account, :display_name => user.display_name
+    assert_match /Confirmed your change of email address/, flash[:notice]
+    # gravatar use should now be enabled
+    assert User.find(users(:first_gravatar_user).id).image_use_gravatar
   end
 
   def test_gravatar_auto_disable
-    with_http_stubs "gravatar" do
-      # switch to email without a gravatar
-      user = users(:second_gravatar_user)
-      confirm_string = user.tokens.create.token
-      # precondition gravatar should be turned on
-      assert user.image_use_gravatar
-      post :confirm_email, :confirm_string => confirm_string
-      assert_response :redirect
-      assert_redirected_to :action => :account, :display_name => user.display_name
-      assert_match /Confirmed your change of email address/, flash[:notice]
-      # gravatar use should now be disabled
-      assert !User.find(users(:second_gravatar_user).id).image_use_gravatar
-    end
+    # switch to email without a gravatar
+    user = users(:second_gravatar_user)
+    stub_gravatar_request(user.new_email, 404)
+    confirm_string = user.tokens.create.token
+    # precondition gravatar should be turned on
+    assert user.image_use_gravatar
+    post :confirm_email, :confirm_string => confirm_string
+    assert_response :redirect
+    assert_redirected_to :action => :account, :display_name => user.display_name
+    assert_match /Confirmed your change of email address/, flash[:notice]
+    # gravatar use should now be disabled
+    assert !User.find(users(:second_gravatar_user).id).image_use_gravatar
   end
 
   def test_terms_new_user