Check if the path is valid when using WithPath(...) (#1377)

test/WireMock.Net.Tests/Validators/PathValidatorTests.cs

@@ -0,0 +1,42 @@
+// Copyright © WireMock.Net
+
+using System;
+using System.Diagnostics.CodeAnalysis;
+using FluentAssertions;
+using WireMock.Validators;
+using Xunit;
+
+namespace WireMock.Net.Tests.Validators;
+
+[ExcludeFromCodeCoverage]
+public class PathValidatorTests
+{
+    [Fact]
+    public void ValidateAndThrow_ValidPath_DoesNotThrow()
+    {
+        Action act = () => PathValidator.ValidateAndThrow("/valid/path");
+        act.Should().NotThrow();
+    }
+
+    [Theory]
+    [InlineData(null)]
+    [InlineData("")]
+    [InlineData("\r")]
+    [InlineData("\n")]
+    [InlineData("\t")]
+    public void ValidateAndThrow_InvalidPath_ThrowsArgumentException_WithDefaultParamName(string? path)
+    {
+        Action act = () => PathValidator.ValidateAndThrow(path);
+        var ex = act.Should().Throw<ArgumentException>().Which;
+        ex.Message.Should().StartWith("Path must start with a '/' and cannot be null, empty or whitespace.");
+        ex.ParamName.Should().Be("path");
+    }
+
+    [Fact]
+    public void ValidateAndThrow_NoLeadingSlash_ThrowsArgumentException_WithProvidedParamName()
+    {
+        Action act = () => PathValidator.ValidateAndThrow("noSlash", "myParam");
+        var ex = act.Should().Throw<ArgumentException>().Which;
+        ex.ParamName.Should().Be("myParam");
+    }
+}