Added some missing tests

Author: linkdotnet

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

@@ -119,7 +119,7 @@ public void ShouldThrowIfNotAppendable()
 
         try
         {
-            builder.Insert(0, Guid.Empty, bufferSize: 1);
+            builder.Append(Guid.Empty, bufferSize: 1);
         }
         catch (InvalidOperationException)
         {
@@ -129,4 +129,16 @@ public void ShouldThrowIfNotAppendable()
 
         Assert.False(true);
     }
+
+    [Theory]
+    [InlineData(true, "True")]
+    [InlineData(false, "False")]
+    public void ShouldAppendBoolean(bool value, string expected)
+    {
+        using var builder = new ValueStringBuilder();
+
+        builder.Append(value);
+
+        builder.ToString().Should().Be(expected);
+    }
 }

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

@@ -134,4 +134,14 @@ public void ShouldThrowIfNotInsertable()
 
         Assert.False(true);
     }
+
+    [Fact]
+    public void ShouldInsertBool()
+    {
+        using var builder = new ValueStringBuilder();
+
+        builder.Insert(0, true);
+
+        builder.ToString().Should().Be("True");
+    }
 }

tests/LinkDotNet.StringBuilder.UnitTests/ValueStringBuilderTests.cs

@@ -416,4 +416,28 @@ public void ImplicitCastFromReadOnlySpanToValueStringBuilder()
 
         sb.ToString().Should().Be("Hello World");
     }
+
+    [Fact]
+    public void ConcatArbitraryValues()
+    {
+        var result = ValueStringBuilder.Concat(new[] { "Hello", " ", "World" });
+
+        result.Should().Be("Hello World");
+    }
+
+    [Fact]
+    public void ShouldReturnEmptyStringIfEmptyArray()
+    {
+        var result = ValueStringBuilder.Concat(Array.Empty<string>());
+
+        result.Should().Be(string.Empty);
+    }
+
+    [Fact]
+    public void ConcatBooleanWithNumber()
+    {
+        var result = ValueStringBuilder.Concat(true, 1);
+
+        result.Should().Be("True1");
+    }
 }