Core.Test with example test using nsub and xunit

test/Core.Test/Core.Test.csproj

@@ -16,4 +16,8 @@
     </PackageReference>
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Core\Core.csproj" />
+  </ItemGroup>
+
 </Project>

test/Core.Test/Services/DeviceServiceTests.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Threading.Tasks;
+using Bit.Core.Repositories;
+using Bit.Core.Services;
+using NSubstitute;
+using Xunit;
+
+namespace Bit.Core.Test.Services
+{
+    public class DeviceServiceTests
+    {
+        [Fact]
+        public async Task DeviceSaveShouldUpdateRevisionDateAndPushRegistration()
+        {
+            var deviceRepo = Substitute.For<IDeviceRepository>();
+            var pushRepo = Substitute.For<IPushRegistrationService>();
+            var deviceService = new DeviceService(deviceRepo, pushRepo);
+
+            var id = Guid.NewGuid();
+            var userId = Guid.NewGuid();
+            var device = new Models.Table.Device
+            {
+                Id = id,
+                Name = "test device",
+                Type = Enums.DeviceType.Android,
+                UserId = userId,
+                PushToken = "testtoken",
+                Identifier = "testid"
+            };
+            await deviceService.SaveAsync(device);
+
+            Assert.True(device.RevisionDate - DateTime.UtcNow < TimeSpan.FromSeconds(1));
+            await pushRepo.Received().CreateOrUpdateRegistrationAsync("testtoken", id.ToString(),
+                userId.ToString(), "testid", Enums.DeviceType.Android);
+        }
+    }
+}

test/Core/UnitTest1.cs

@@ -1,14 +0,0 @@
-using System;
-using Xunit;
-
-namespace Bit.Core.Test
-{
-    public class UnitTest1
-    {
-        [Fact]
-        public void Test1()
-        {
-            Assert.True(true);
-        }
-    }
-}