added RetrieveFollowersProcessor tests

src/Tests/BirdsiteLive.Pipeline.Tests/Processors/RetrieveFollowersProcessorTests.cs

@@ -0,0 +1,79 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using BirdsiteLive.DAL.Contracts;
+using BirdsiteLive.DAL.Models;
+using BirdsiteLive.Pipeline.Models;
+using BirdsiteLive.Pipeline.Processors;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Moq;
+
+namespace BirdsiteLive.Pipeline.Tests.Processors
+{
+    [TestClass]
+    public class RetrieveFollowersProcessorTests
+    {
+        [TestMethod]
+        public async Task ProcessAsync_Test()
+        {
+            #region Stubs
+            var userId1 = 1;
+            var userId2 = 2;
+
+            var users = new List<UserWithTweetsToSync>
+            {
+                new UserWithTweetsToSync
+                {
+                    User = new SyncTwitterUser
+                    {
+                        Id = userId1
+                    }
+                },
+                new UserWithTweetsToSync
+                {
+                    User = new SyncTwitterUser
+                    {
+                        Id = userId2
+                    }
+                }
+            };
+
+            var followersUser1 = new List<Follower>
+            {
+                new Follower(),
+                new Follower(),
+            };
+            var followersUser2 = new List<Follower>
+            {
+                new Follower(),
+                new Follower(),
+                new Follower(),
+            };
+            #endregion
+
+            #region Mocks
+            var followersDalMock = new Mock<IFollowersDal>(MockBehavior.Strict);
+            followersDalMock
+                .Setup(x => x.GetFollowersAsync(It.Is<int>(y => y == userId1)))
+                .ReturnsAsync(followersUser1.ToArray());
+
+            followersDalMock
+                .Setup(x => x.GetFollowersAsync(It.Is<int>(y => y == userId2)))
+                .ReturnsAsync(followersUser2.ToArray());
+            #endregion
+
+            var processor = new RetrieveFollowersProcessor(followersDalMock.Object);
+            var result = (await processor.ProcessAsync(users.ToArray(), CancellationToken.None)).ToList();
+
+            #region Validations
+            Assert.IsNotNull(result);
+            Assert.AreEqual(2, result.Count);
+            Assert.AreEqual(2, result.First(x => x.User.Id == userId1).Followers.Length);
+            Assert.AreEqual(3, result.First(x => x.User.Id == userId2).Followers.Length);
+
+            followersDalMock.VerifyAll();
+            #endregion
+        }
+    }
+}