add user follow feature

spec/factories/user_follows.rb

@@ -0,0 +1,6 @@
+FactoryBot.define do
+  factory :user_follow do
+    follower { nil }
+    followed { nil }
+  end
+end

spec/factories/users.rb

@@ -1,5 +1,5 @@
 FactoryBot.define do
   factory :user do
-    username { "xpto" }
+    username { Faker::Internet.username.gsub(/[^0-9a-z ]/i, '') }
   end
 end

spec/requests/user_follows_spec.rb

@@ -0,0 +1,67 @@
+require 'rails_helper'
+
+RSpec.describe "/user_follows", type: :request do
+  let(:followed) { create(:user) }
+  let(:follower) { create(:user) }
+
+  let(:valid_attributes) {
+    {
+      followed_id: followed.id,
+      follower_id: follower.id
+    }
+  }
+
+  let(:invalid_attributes) {
+    {
+      followed_id: followed.id,
+      follower_id: 'follower.id'
+    }
+  }
+
+  let(:valid_headers) {
+    {}
+  }
+
+  describe "POST /create" do
+    context "with valid parameters" do
+      it "creates a new UserFollow" do
+        expect {
+          post user_follows_url,
+               params: { user_follow: valid_attributes }, headers: valid_headers, as: :json
+        }.to change(UserFollow, :count).by(1)
+      end
+
+      it "renders a JSON response with the new user_follow" do
+        post user_follows_url,
+             params: { user_follow: valid_attributes }, headers: valid_headers, as: :json
+        expect(response).to have_http_status(:created)
+        expect(response.content_type).to match(a_string_including("application/json"))
+      end
+    end
+
+    context "with invalid parameters" do
+      it "does not create a new UserFollow" do
+        expect {
+          post user_follows_url,
+               params: { user_follow: invalid_attributes }, as: :json
+        }.to change(UserFollow, :count).by(0)
+      end
+
+      it "renders a JSON response with errors for the new user_follow" do
+        post user_follows_url,
+             params: { user_follow: invalid_attributes }, headers: valid_headers, as: :json
+        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response.content_type).to match(a_string_including("application/json"))
+      end
+    end
+  end
+
+  describe "DELETE /destroy" do
+    it "destroys the requested user_follow" do
+      user_follow = UserFollow.create! valid_attributes
+      expect {
+        delete user_follow_url(user_follow), headers: valid_headers, as: :json
+      }.to change(UserFollow, :count).by(-1)
+    end
+  end
+end

spec/routing/user_follows_routing_spec.rb

@@ -0,0 +1,13 @@
+require "rails_helper"
+
+RSpec.describe UserFollowsController, type: :routing do
+  describe "routing" do
+    it "routes to #create" do
+      expect(post: "/user_follows").to route_to("user_follows#create")
+    end
+
+    it "routes to #destroy" do
+      expect(delete: "/user_follows/1").to route_to("user_follows#destroy", id: "1")
+    end
+  end
+end