make user_controller tests not env dependent

spec/controllers/users_controller_spec.rb

@@ -43,6 +43,8 @@ describe UsersController, type: :controller do
   end
 
   describe "GET #new" do
+    before { allow(Rails.configuration).to receive(:allow_user_signup).and_return(true) }
+
     it "assigns a blank user to the view" do
       get :new
       expect(assigns(:user)).to be_a_new(User)
@@ -50,7 +52,10 @@ describe UsersController, type: :controller do
   end
 
   describe "POST #create" do
-    it "redirects to user room on succesful create" do
+    context "allow greenlight accounts" do
+      before { allow(Rails.configuration).to receive(:allow_user_signup).and_return(true) }
+
+      it "redirects to user room on successful create" do
         params = random_valid_user_params
         post :create, params: params
 
@@ -61,14 +66,6 @@ describe UsersController, type: :controller do
         expect(response).to redirect_to(room_path(u.main_room))
       end
 
-    it "redirects to main room if already authenticated" do
-      user = create(:user)
-      @request.session[:user_id] = user.id
-
-      post :create, params: random_valid_user_params
-      expect(response).to redirect_to(room_path(user.main_room))
-    end
-
       it "user saves with greenlight provider" do
         params = random_valid_user_params
         post :create, params: params
@@ -85,6 +82,28 @@ describe UsersController, type: :controller do
       end
     end
 
+    context "disallow greenlight accounts" do
+      before { allow(Rails.configuration).to receive(:allow_user_signup).and_return(false) }
+
+      it "redirect to root on attempted create" do
+        params = random_valid_user_params
+        post :create, params: params
+
+        u = User.find_by(name: params[:user][:name], email: params[:user][:email])
+
+        expect(u).to be_nil
+      end
+    end
+
+    it "redirects to main room if already authenticated" do
+      user = create(:user)
+      @request.session[:user_id] = user.id
+
+      post :create, params: random_valid_user_params
+      expect(response).to redirect_to(room_path(user.main_room))
+    end
+  end
+
   describe "PATCH #update" do
     it "properly updates user attributes" do
       user = create(:user)