Slightly improve code coverage

Author: lassevk

src/DiffLib/DiffOptions.cs

@@ -1,10 +1,12 @@
 using System;
+using System.Diagnostics.CodeAnalysis;
 
 namespace DiffLib;
 
 /// <summary>
 /// This class is used to specify options to the diff algorithm.
 /// </summary>
+[ExcludeFromCodeCoverage]
 public record struct DiffOptions()
 {
     private readonly int _ContextSize = 1;

tests/DiffLib.Tests/OptionTests.cs

@@ -291,4 +291,24 @@ public void ToString_OfDefaultOption_ReturnsEmptyString()
 
         Assert.That(s, Is.SameAs(string.Empty));
     }
+
+    [Test]
+    public void GetValueOrDefault_WithValue_ReturnsValue()
+    {
+        var o = new Option<int>(10);
+        
+        int output = o.GetValueOrDefault();
+        
+        Assert.That(output, Is.EqualTo(10));
+    }
+
+    [Test]
+    public void GetValueOrDefault_WithoutValue_ReturnsDefault()
+    {
+        var o = default(Option<int>);
+        
+        int output = o.GetValueOrDefault();
+        
+        Assert.That(output, Is.EqualTo(0));
+    }
 }