diff --git a/src/Ombi.Core.Tests/Authentication/OmbiUserManagerTests.cs b/src/Ombi.Core.Tests/Authentication/OmbiUserManagerTests.cs
new file mode 100644
index 000000000..bd6e8d5a2
--- /dev/null
+++ b/src/Ombi.Core.Tests/Authentication/OmbiUserManagerTests.cs
@@ -0,0 +1,106 @@
+using Microsoft.AspNetCore.Identity;
+using Moq;
+using NUnit.Framework;
+using Ombi.Api.Plex;
+using Ombi.Api.Plex.Models;
+using Ombi.Core.Authentication;
+using Ombi.Core.Settings;
+using Ombi.Settings.Settings.Models;
+using Ombi.Store.Entities;
+using Ombi.Test.Common;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Ombi.Core.Tests.Authentication
+{
+    [TestFixture]
+    public class OmbiUserManagerTests
+    {
+
+        [SetUp]
+        public void Setup()
+        {
+
+            UserStore = new Mock<IUserStore<OmbiUser>>();
+            PlexApi = new Mock<IPlexApi>();
+            AuthenticationSettings = new Mock<ISettingsService<AuthenticationSettings>>();
+
+            AuthenticationSettings.Setup(x => x.GetSettingsAsync())
+                .ReturnsAsync(new AuthenticationSettings());
+            _um = new OmbiUserManager(UserStore.Object, null, null, null, null, null, null, null, null,
+                PlexApi.Object, null, null, AuthenticationSettings.Object);
+        }
+
+        public OmbiUserManager _um { get; set; }
+        private Mock<IUserStore<OmbiUser>> UserStore { get; set; }
+        private Mock<IPlexApi> PlexApi { get; set; }
+        private Mock<ISettingsService<AuthenticationSettings>> AuthenticationSettings { get; set; }
+
+        [Test]
+        public async Task CheckPassword_PlexUser_EmailLogin_ValidPassword()
+        {
+            var user = new OmbiUser
+            {
+                UserType = UserType.PlexUser,
+                EmailLogin = true,
+                Email = "MyEmail@email.com"
+            };
+            PlexApi.Setup(x => x.SignIn(It.IsAny<UserRequest>()))
+                .ReturnsAsync(new PlexAuthentication
+                {
+                    user = new User
+                    {
+                        authentication_token = "abc"
+                    }
+                });
+            var result = await _um.CheckPasswordAsync(user, "pass");
+
+            Assert.That(result, Is.True);
+            PlexApi.Verify(x => x.SignIn(It.Is<UserRequest>(c => c.login == "MyEmail@email.com")), Times.Once);
+        }
+
+        [Test]
+        public async Task CheckPassword_PlexUser_UserNameLogin_ValidPassword()
+        {
+            var user = new OmbiUser
+            {
+                UserType = UserType.PlexUser,
+                EmailLogin = false,
+                Email = "MyEmail@email.com",
+                UserName = "heyhey"
+            };
+            PlexApi.Setup(x => x.SignIn(It.IsAny<UserRequest>()))
+                .ReturnsAsync(new PlexAuthentication
+                {
+                    user = new User
+                    {
+                        authentication_token = "abc"
+                    }
+                });
+            var result = await _um.CheckPasswordAsync(user, "pass");
+
+            Assert.That(result, Is.True);
+            PlexApi.Verify(x => x.SignIn(It.Is<UserRequest>(c => c.login == "heyhey")), Times.Once);
+        }
+
+        [Test]
+        public async Task CheckPassword_PlexUser_UserNameLogin_InvalidPassword()
+        {
+            var user = new OmbiUser
+            {
+                UserType = UserType.PlexUser,
+                EmailLogin = false,
+                Email = "MyEmail@email.com",
+                UserName = "heyhey"
+            };
+            PlexApi.Setup(x => x.SignIn(It.IsAny<UserRequest>()))
+                .ReturnsAsync(new PlexAuthentication());
+            var result = await _um.CheckPasswordAsync(user, "pass");
+
+            Assert.That(result, Is.False);
+            PlexApi.Verify(x => x.SignIn(It.Is<UserRequest>(c => c.login == "heyhey")), Times.Once);
+        }
+    }
+}