Added training reminder worker

FabApprovalWorkerServiceTests/UserServiceTests.cs

@@ -2,6 +2,7 @@ using FabApprovalWorkerService.Models;
 using FabApprovalWorkerService.Services;
 
 using Microsoft.Extensions.Logging;
+using Microsoft.Identity.Client;
 
 using Moq;
 
@@ -458,4 +459,56 @@ internal class UserServiceTests {
 
         Assert.That(actualEmail, Is.EqualTo(emailsFromDb.First()));
     }
+
+    [Test]
+    public void GetUserByIdWithInvalidIdShouldThrowException() {
+        _userService = new UserService(MOCK_LOGGER, _mockDalService.Object);
+
+        Assert.ThrowsAsync<ArgumentException>(async Task () => await _userService.GetUserById(-4));
+
+        Assert.ThrowsAsync<ArgumentException>(async Task () => await _userService.GetUserById(0));
+    }
+
+    [Test]
+    public void GetUserByIdDbErrorShouldThrowException() {
+        _mockDalService.Setup(d => d.QueryAsync<User>(It.IsAny<string>())).Throws(new Exception());
+
+        _userService = new UserService(MOCK_LOGGER, _mockDalService.Object);
+
+        Assert.ThrowsAsync<Exception>(async Task () => await _userService.GetUserById(5));
+    }
+
+    [Test]
+    public void GetUserByIdNoUserFoundShouldThrowException() {
+        IEnumerable<User> emptyUsers = new List<User>();
+
+        _mockDalService.Setup(d => d.QueryAsync<User>(It.IsAny<string>())).Returns(Task.FromResult(emptyUsers));
+
+        Assert.ThrowsAsync<Exception>(async Task() => await _userService.GetUserById(5));
+    }
+
+    [Test]
+    public async Task GetUserByIdShouldReturnExpectedUser() {
+        IEnumerable<User> expectedUsers = new List<User>() { 
+            new User() {
+                UserID = 1,
+                LoginID = "id",
+                FirstName = "firstName",
+                LastName = "lastName",
+                Email = "email",
+                IsAdmin = false,
+                OOO = false,
+                CanViewITAR = true,
+                IsManager = false
+            }
+        };
+
+        _mockDalService.Setup(d => d.QueryAsync<User>(It.IsAny<string>())).Returns(Task.FromResult(expectedUsers));
+
+        _userService = new UserService(MOCK_LOGGER, _mockDalService.Object);
+
+        User actualUser = await _userService.GetUserById(4);
+
+        Assert.That(expectedUsers.First(), Is.EqualTo(actualUser));
+    }
 }