coverage: add missing Web tests (#618)

Adds missing unit-test coverage for `It.IsHttpContent()` string-body matching `ToString()` descriptions in the Web test suite.

### Key Changes:
- Added `ToString()` tests for `WithString(...).Exactly().IgnoringCase()`.
- Added `ToString()` tests for `WithStringMatching(...).AsRegex(...)` with `IgnoringCase()` and with explicit `RegexOptions`.

Author: vbreuss

Source/Mockolate/Web/HttpClientExtensions.cs

@@ -76,15 +76,9 @@ public void InvokeCallbacks(object? value)
 
 		/// <inheritdoc cref="object.ToString()" />
 		public override string ToString()
-		{
-			string prefix = $"{method.Method}-Request";
-			if (parameters.Length == 0)
-			{
-				return prefix;
-			}
-
-			return $"{prefix} with {string.Join(" and ", parameters.Select(p => p.ToString()))}";
-		}
+			// At least one parameter is always present: all construction sites in HttpClientExtensions
+			// (GetAsync, PostAsync, PutAsync, PatchAsync, DeleteAsync) pass at least one IHttpRequestMessageParameter.
+			=> $"{method.Method}-Request with {string.Join(" and ", parameters.Select(p => p.ToString()))}";
 	}
 
 	private interface IHttpRequestMessageParameter
@@ -118,8 +112,8 @@ public void InvokeCallbacks(HttpRequestMessage value)
 		}
 
 		/// <inheritdoc cref="object.ToString()" />
-		public override string ToString()
-			=> parameter.ToString() ?? string.Empty;
+		public override string? ToString()
+			=> parameter.ToString();
 	}
 
 	private sealed class HttpStringUriParameter(IParameter<string?> parameter)

Tests/Mockolate.Tests/Web/ItExtensionsTests.IsHttpContentTests.ToStringTests.cs

@@ -1,3 +1,4 @@
+using System.Text.RegularExpressions;
 using Mockolate.Web;
 
 namespace Mockolate.Tests.Web;
@@ -111,11 +112,14 @@ public async Task WithFormData_StringMultiple_ShouldReturnExpectedValue()
 			public async Task WithHeaders_Multiple_ShouldReturnExpectedValue()
 			{
 				ItExtensions.IHttpContentParameter sut =
-					It.IsHttpContent().WithHeaders(("x-my-header", "my-value"), ("x-my-other-header", "my-other-value"));
+					It.IsHttpContent()
+						.WithHeaders(("x-my-header", "my-value"), ("x-my-other-header", "my-other-value"));
 
 				string? result = sut.ToString();
 
-				await That(result).IsEqualTo("Http content with headers \"x-my-header: my-value\", \"x-my-other-header: my-other-value\"");
+				await That(result)
+					.IsEqualTo(
+						"Http content with headers \"x-my-header: my-value\", \"x-my-other-header: my-other-value\"");
 			}
 
 			[Fact]
@@ -161,6 +165,17 @@ public async Task WithMediaTypeViaFactory_ShouldReturnExpectedValue()
 				await That(result).IsEqualTo("Http content with media type \"application/json\"");
 			}
 
+			[Fact]
+			public async Task WithString_Exactly_IgnoringCase_ShouldReturnExpectedValue()
+			{
+				ItExtensions.IStringContentBodyParameter sut = It.IsHttpContent().WithString("foo").Exactly()
+					.IgnoringCase();
+
+				string? result = sut.ToString();
+
+				await That(result).IsEqualTo("string content equal to \"foo\" ignoring case");
+			}
+
 			[Fact]
 			public async Task WithString_Exactly_ShouldReturnExpectedValue()
 			{
@@ -192,6 +207,29 @@ public async Task WithString_ShouldReturnExpectedValue()
 				await That(result).IsEqualTo("string content containing \"foo\"");
 			}
 
+			[Fact]
+			public async Task WithStringMatching_AsRegex_IgnoringCase_ShouldReturnExpectedValue()
+			{
+				ItExtensions.IStringContentBodyParameter sut =
+					It.IsHttpContent().WithStringMatching("^foo").AsRegex().IgnoringCase();
+
+				string? result = sut.ToString();
+
+				await That(result).IsEqualTo("string content matching regex pattern \"^foo\" ignoring case");
+			}
+
+			[Fact]
+			public async Task WithStringMatching_AsRegex_IgnoringCase_WithOptions_ShouldReturnExpectedValue()
+			{
+				ItExtensions.IStringContentBodyParameter sut =
+					It.IsHttpContent().WithStringMatching("^foo").AsRegex(RegexOptions.Multiline).IgnoringCase();
+
+				string? result = sut.ToString();
+
+				await That(result)
+					.IsEqualTo("string content matching regex pattern \"^foo\" ignoring case with options Multiline");
+			}
+
 			[Fact]
 			public async Task WithStringMatching_AsRegex_ShouldReturnExpectedValue()
 			{
@@ -203,6 +241,28 @@ public async Task WithStringMatching_AsRegex_ShouldReturnExpectedValue()
 				await That(result).IsEqualTo("string content matching regex pattern \"^foo\"");
 			}
 
+			[Fact]
+			public async Task WithStringMatching_AsRegex_WithOptions_ShouldReturnExpectedValue()
+			{
+				ItExtensions.IStringContentBodyParameter sut =
+					It.IsHttpContent().WithStringMatching("^foo").AsRegex(RegexOptions.Multiline);
+
+				string? result = sut.ToString();
+
+				await That(result).IsEqualTo("string content matching regex pattern \"^foo\" with options Multiline");
+			}
+
+			[Fact]
+			public async Task WithStringMatching_IgnoringCase_ShouldReturnExpectedValue()
+			{
+				ItExtensions.IStringContentBodyParameter sut =
+					It.IsHttpContent().WithStringMatching("*foo*").IgnoringCase();
+
+				string? result = sut.ToString();
+
+				await That(result).IsEqualTo("string content matching pattern \"*foo*\" ignoring case");
+			}
+
 			[Fact]
 			public async Task WithStringMatching_ShouldReturnExpectedValue()
 			{