Added more tests

Author: linkdotnet

tests/LinkDotNet.StringBuilder.UnitTests/ValueStringBuilder.Replace.Tests.cs

@@ -1,3 +1,5 @@
+using System;
+
 namespace LinkDotNet.StringBuilder.UnitTests;
 
 public class ValueStringBuilderReplaceTests
@@ -24,6 +26,26 @@ public void ShouldReplaceAllCharactersInGivenSpan()
         builder.ToString().Should().Be("CBBC");
     }
 
+    [Theory]
+    [InlineData(-1, 1)]
+    [InlineData(1, 1)]
+    public void ShouldThrowExceptionWhenOutOfRange(int startIndex, int count)
+    {
+        var builder = new ValueStringBuilder();
+
+        try
+        {
+            builder.Replace('a', 'b', startIndex, count);
+        }
+        catch (ArgumentOutOfRangeException)
+        {
+            Assert.True(true);
+            return;
+        }
+
+        Assert.True(false);
+    }
+
     [Fact]
     public void ShouldReplaceAllText()
     {

tests/LinkDotNet.StringBuilder.UnitTests/ValueStringBuilderTests.cs

@@ -159,6 +159,42 @@ public void ShouldFindInSubstring()
         index.Should().Be(3);
     }
 
+    [Fact]
+    public void ShouldThrowExceptionWhenNegativeStartIndex()
+    {
+        var stringBuilder = new ValueStringBuilder();
+
+        try
+        {
+            stringBuilder.IndexOf("l", -1);
+        }
+        catch (ArgumentOutOfRangeException)
+        {
+            Assert.True(true);
+            return;
+        }
+
+        Assert.True(false);
+    }
+
+    [Fact]
+    public void ShouldThrowExceptionWhenNegativeStartIndexLastIndex()
+    {
+        var stringBuilder = new ValueStringBuilder();
+
+        try
+        {
+            stringBuilder.LastIndexOf("l", -1);
+        }
+        catch (ArgumentOutOfRangeException)
+        {
+            Assert.True(true);
+            return;
+        }
+
+        Assert.True(false);
+    }
+
     [Fact]
     public void ShouldReturnMinusOneIfNotFound()
     {