[Improve] code coverage

DEH-CSV.Tests/CsvReaderTestFixture.cs

@@ -155,5 +155,24 @@ public async Task VerifyCsvReaderImplementation()
                 count++;
             }
         }
+
+        [Test]
+        public void Verify_that_when_ReadAsync_is_called_with_null_or_empty_arguments_exception_is_thrown()
+        {
+            Stream stream = new MemoryStream();
+            IReadOnlyCollection<TypeMap> typeMaps = new List<TypeMap>();
+
+            Assert.That(() => this.csvReader.ReadAsync(null, null, null), 
+                Throws.ArgumentNullException);
+
+            Assert.That(() => this.csvReader.ReadAsync(stream, null, null),
+                Throws.ArgumentNullException);
+
+            Assert.That(() => this.csvReader.ReadAsync(stream, typeMaps, null),
+                Throws.ArgumentNullException);
+
+            Assert.That(() => this.csvReader.ReadAsync(stream, typeMaps, this.session),
+                Throws.ArgumentException);
+        }
     }
 }

DEH-CSV.Tests/CustomProperties/ThingTimeStampPropertyEvaluatorTestFixture.cs

@@ -0,0 +1,72 @@
+// -------------------------------------------------------------------------------------------------
+//  <copyright file="ThingTimeStampPropertyEvaluatorTestFixture.cs" company="Starion Group S.A.">
+// 
+//    Copyright 2023-2024 Starion Group S.A.
+// 
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+// 
+//        http://www.apache.org/licenses/LICENSE-2.0
+// 
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+// 
+//  </copyright>
+//  -------------------------------------------------------------------------------------------------
+
+namespace STARIONGROUP.DEHCSV.Tests.CustomProperties
+{
+    using System;
+    using System.Collections.Concurrent;
+    using System.IO;
+    using System.Runtime.InteropServices;
+    using System.Threading.Tasks;
+    using CDP4Common.CommonData;
+    using CDP4Common.SiteDirectoryData;
+    using CDP4Common.Types;
+    using CDP4Dal;
+    using CDP4Dal.DAL;
+    using Newtonsoft.Json.Bson;
+    using NUnit.Framework;
+
+    using STARIONGROUP.DEHCSV.CustomProperties;
+    using STARIONGROUP.DEHCSV.Mapping;
+    using STARIONGROUP.DEHCSV.Services;
+
+    /// <summary>
+    /// Suite of tests for the <see cref="ThingTimeStampPropertyEvaluator"/> class
+    /// </summary>
+    [TestFixture]
+    public class ThingTimeStampPropertyEvaluatorTestFixture
+    {
+        private ThingTimeStampPropertyEvaluator thingTimeStampPropertyEvaluator;
+
+        [SetUp]
+        public void Setup()
+        {
+            this.thingTimeStampPropertyEvaluator = new ThingTimeStampPropertyEvaluator();
+        }
+
+        [Test]
+        public void Verify_that_when_Thing_is_null_exception_is_thrown()
+        {
+            Assert.That(() => this.thingTimeStampPropertyEvaluator.QueryValue(null, new PropertyMap(), null),
+                Throws.ArgumentNullException); ;
+        }
+
+        [Test]
+        public void Verify_that_when_value_is_queried_expected_result_is_returned()
+        {
+            var domainOfExpertise = new DomainOfExpertise(Guid.NewGuid(), new ConcurrentDictionary<CacheKey, Lazy<Thing>>(),
+                new Uri("http://stariongroup.eu"));
+
+            var result = this.thingTimeStampPropertyEvaluator.QueryValue(domainOfExpertise, new PropertyMap(), null);
+
+            Assert.That(result, Does.StartWith("DomainOfExpertise:"));
+        }
+    }
+}

DEH-CSV.Tests/Services/DataSourceSelectorTestFixture.cs

@@ -48,6 +48,12 @@ public void SetUp()
             this.dataSourceSelector = new DataSourceSelector(this.loggerFactory);
         }
 
+        [Test]
+        public void Verify_that_when_select_is_called_with_null_uri_exception_is_thrown()
+        {
+            Assert.That(() => this.dataSourceSelector.Select(null), Throws.ArgumentNullException); 
+        }
+
         [Test]
         public void Verify_that_when_a_file_uri_is_provided_a_file_dal_is_returned()
         {

DEH-CSV.Tests/Services/IterationReaderTestFixture.cs

@@ -61,6 +61,13 @@ public void Teardown()
             this.messageBus.Dispose();
         }
 
+        [Test]
+        public void Verify_that_when_ReadAsync_is_called_with_null_iteration_exception_is_thrown()
+        {
+            Assert.That(() => this.iterationReader.ReadAsync(null, "DM_SPC", 1, "SYS"),
+                Throws.ArgumentNullException);
+        }
+
         [Test]
         public async Task Verify_that_iteration_can_be_read_from_data_source_demo_space()
         {