From f8e646a0fda0296e92920ae042d100b67918fb27 Mon Sep 17 00:00:00 2001
From: Darren Horrocks <killallthehumans@gmail.com>
Date: Sat, 21 Oct 2023 22:51:25 +0100
Subject: [PATCH] more tests

---
 bzTorrent.Tests/Extensions/ExtensionsTests.cs | 50 +++++++++++++++++++
 bzTorrent/Extensions/ArgumentExtensions.cs    |  2 +-
 2 files changed, 51 insertions(+), 1 deletion(-)
 create mode 100644 bzTorrent.Tests/Extensions/ExtensionsTests.cs

diff --git a/bzTorrent.Tests/Extensions/ExtensionsTests.cs b/bzTorrent.Tests/Extensions/ExtensionsTests.cs
new file mode 100644
index 0000000..96eca4f
--- /dev/null
+++ b/bzTorrent.Tests/Extensions/ExtensionsTests.cs
@@ -0,0 +1,50 @@
+using FluentAssertions;
+using System;
+using System.Diagnostics;
+using bzTorrent.Helpers;
+using Xunit;
+using bzTorrent.Data;
+using bzTorrent.Extensions;
+using System.Collections.Generic;
+
+namespace bzTorrent.Tests.Extensions
+{
+    public class ExtensionsTests
+    {
+        [Fact]
+        public void IsNullOrEmptyReturnsTrueForEmptyArray()
+        {
+            Array.Empty<object>().IsNullOrEmpty().Should().BeTrue();
+        }
+
+        [Fact]
+        public void IsNullOrEmptyReturnsFalseForArrayWithObjects()
+        {
+            var array = new List<object>() { new object(), new object(), new object() };
+            array.IsNullOrEmpty().Should().BeFalse();
+        }
+
+        [Fact]
+        public void IsNullOrEmptyReturnsTrueForNullCastedToArray()
+        {
+            var nullArray = (object[])null;
+            nullArray.IsNullOrEmpty().Should().BeTrue();
+        }
+
+        [Fact]
+        public void ThrowIfNullThrowsExceptionForNull()
+        {
+            object x = null;
+            var ex = Record.Exception(() => x.ThrowIfNull(nameof(x)));
+            Assert.NotNull(ex);
+        }
+
+        [Fact]
+        public void ThrowIfNullDoesNotThrowExceptionForValidObject()
+        {
+            object x = new();
+            var ex = Record.Exception(() => x.ThrowIfNull(nameof(x)));
+            Assert.Null(ex);
+        }
+    }
+}
diff --git a/bzTorrent/Extensions/ArgumentExtensions.cs b/bzTorrent/Extensions/ArgumentExtensions.cs
index 8d52dfe..0287d7d 100644
--- a/bzTorrent/Extensions/ArgumentExtensions.cs
+++ b/bzTorrent/Extensions/ArgumentExtensions.cs
@@ -47,7 +47,7 @@ public static void ThrowIfNullOrEmpty<T>(this IEnumerable<T> source, string para
 		{
 			if (source.IsNullOrEmpty())
 			{
-				throw new ArgumentNullException("Enumerable cannot be null or empty", paramName);
+				throw new ArgumentNullException(paramName, "Cannot be null or empty");
 			}
 		}
 	}