diff --git a/Retroactiune.UnitTests/Retroactiune.WebAPI/Services/TestTokensService.cs b/Retroactiune.UnitTests/Retroactiune.WebAPI/Services/TestTokensService.cs
new file mode 100644
index 0000000..2c736e3
--- /dev/null
+++ b/Retroactiune.UnitTests/Retroactiune.WebAPI/Services/TestTokensService.cs
@@ -0,0 +1,84 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using MongoDB.Driver;
+using Moq;
+using Retroactiune.Models;
+using Retroactiune.Services;
+using Retroactiune.Settings;
+using Xunit;
+
+namespace Retroactiune.Tests.Retroactiune.WebAPI.Services
+{
+    public class TestTokensService
+    {
+        [Fact]
+        public async Task Test_GenerateTokensAsync_InvalidNumberOfTokens()
+        {
+            // Setup
+            var mongoDatabaseMock = new Mock<IMongoDatabase>();
+            var mongoClientMock = new Mock<IMongoClient>();
+            var mongoSettingsMock = new Mock<IMongoDbSettings>();
+            var mongoCollectionMock = new Mock<IMongoCollection<Token>>();
+
+            mongoSettingsMock.SetupGet(i => i.DatabaseName).Returns("MyDB");
+            mongoSettingsMock.SetupGet(i => i.TokensCollectionName).Returns("tokens");
+
+            mongoClientMock
+                .Setup(stub => stub.GetDatabase(It.IsAny<string>(),
+                    It.IsAny<MongoDatabaseSettings>()))
+                .Returns(mongoDatabaseMock.Object);
+
+            mongoDatabaseMock
+                .Setup(i => i.GetCollection<Token>(It.IsAny<string>(),
+                    It.IsAny<MongoCollectionSettings>()))
+                .Returns(mongoCollectionMock.Object);
+
+            // Test & Assert
+            var service = new TokensService(mongoClientMock.Object, mongoSettingsMock.Object);
+            await Assert.ThrowsAsync<ArgumentException>(async () => { await service.GenerateTokensAsync(-1, ""); });
+        }
+
+        [Fact]
+        public async Task Test_GenerateTokensAsync_Success()
+        {
+            // Setup
+            var mongoDatabaseMock = new Mock<IMongoDatabase>();
+            var mongoClientMock = new Mock<IMongoClient>();
+            var mongoSettingsMock = new Mock<IMongoDbSettings>();
+            var mongoCollectionMock = new Mock<IMongoCollection<Token>>();
+
+            mongoSettingsMock.SetupGet(i => i.DatabaseName).Returns("MyDB");
+            mongoSettingsMock.SetupGet(i => i.TokensCollectionName).Returns("tokens");
+
+            mongoClientMock
+                .Setup(stub => stub.GetDatabase(It.IsAny<string>(),
+                    It.IsAny<MongoDatabaseSettings>()))
+                .Returns(mongoDatabaseMock.Object);
+
+            mongoDatabaseMock
+                .Setup(i => i.GetCollection<Token>(It.IsAny<string>(),
+                    It.IsAny<MongoCollectionSettings>()))
+                .Returns(mongoCollectionMock.Object);
+
+            // Test
+            var expiryTime = DateTime.UtcNow;
+            var service = new TokensService(mongoClientMock.Object, mongoSettingsMock.Object);
+            await service.GenerateTokensAsync(3, "Hello", expiryTime);
+
+            // Assert
+            var item = new Token
+            {
+                Id = null,
+                ExpiryTime = null,
+                TimeUsed = null,
+                FeedbackReceiverId = "Hello",
+                CreatedAt = expiryTime
+            };
+            mongoCollectionMock.Verify(
+                i => i.InsertManyAsync(new[] {item, item, item},
+                    It.IsAny<InsertManyOptions>(),
+                    It.IsAny<CancellationToken>()), Times.Once);
+        }
+    }
+}
\ No newline at end of file
diff --git a/Retroactiune.WebAPI/Models/FeedbackReceiver.cs b/Retroactiune.WebAPI/Models/FeedbackReceiver.cs
index 80d9b82..4c5738d 100644
--- a/Retroactiune.WebAPI/Models/FeedbackReceiver.cs
+++ b/Retroactiune.WebAPI/Models/FeedbackReceiver.cs
@@ -27,7 +27,7 @@ namespace Retroactiune.Models
                 return false;
             }
 
-            return Id.Equals(convertedObj.Id) && Name.Equals(convertedObj.Name) &&
+            return string.Equals(Id, convertedObj.Id) && string.Equals(Name, convertedObj.Name) &&
                    Description.Equals(convertedObj.Description) && CreatedAt.Equals(convertedObj.CreatedAt);
         }
 
diff --git a/Retroactiune.WebAPI/Models/Token.cs b/Retroactiune.WebAPI/Models/Token.cs
index 014d296..db929ab 100644
--- a/Retroactiune.WebAPI/Models/Token.cs
+++ b/Retroactiune.WebAPI/Models/Token.cs
@@ -14,17 +14,30 @@ namespace Retroactiune.Models
         [BsonId, JsonPropertyName("id")]
         [BsonRepresentation(BsonType.ObjectId)]
         public string Id { get; set; }
-        
+
         [BsonRepresentation(BsonType.ObjectId), JsonPropertyName("feedback_receiver_id")]
         public string FeedbackReceiverId { get; set; }
-        
-        [JsonPropertyName("time_used")]
-        public DateTime? TimeUsed { get; set; }
-        
-        [JsonPropertyName("created_at")]
-        public DateTime CreatedAt { get; set; }
-        
-        [JsonPropertyName("expiry_time")]
-        public DateTime? ExpiryTime { get; set; }
+
+        [JsonPropertyName("time_used")] public DateTime? TimeUsed { get; set; }
+
+        [JsonPropertyName("created_at")] public DateTime CreatedAt { get; set; }
+
+        [JsonPropertyName("expiry_time")] public DateTime? ExpiryTime { get; set; }
+
+        public override bool Equals(object obj)
+        {
+            if (!(obj is Token convertedObj))
+            {
+                return false;
+            }
+            
+            return string.Equals(Id, convertedObj.Id) && string.Equals(FeedbackReceiverId, convertedObj.FeedbackReceiverId) &&
+                   TimeUsed == convertedObj.TimeUsed && ExpiryTime == convertedObj.ExpiryTime;
+        }
+
+        public override int GetHashCode()
+        {
+            return base.GetHashCode();
+        }
     }
 }
\ No newline at end of file
diff --git a/Retroactiune.WebAPI/Services/TokensService.cs b/Retroactiune.WebAPI/Services/TokensService.cs
index a96fa54..853ff7e 100644
--- a/Retroactiune.WebAPI/Services/TokensService.cs
+++ b/Retroactiune.WebAPI/Services/TokensService.cs
@@ -20,12 +20,11 @@ namespace Retroactiune.Services
         public async Task GenerateTokensAsync(int numberOfTokens, string feedbackReceiverGuid,
             DateTime? expiryTime = null)
         {
-            // TODO: Test unit
             if (numberOfTokens <= 0)
             {
                 throw new ArgumentException("numberOfTokens must be positive");
             }
-            
+
             var token = new List<Token>();
             for (var i = 0; i < numberOfTokens; i++)
             {