Fix FluentAssertions on Header(s) (#1080)

* Fix FluentAssertions on Header(s)

* ...

src/WireMock.Net.FluentAssertions/Assertions/WireMockAssertions.WithHeader.cs

@@ -0,0 +1,157 @@
+#pragma warning disable CS1591
+using System.Collections.Generic;
+using WireMock.Types;
+
+// ReSharper disable once CheckNamespace
+namespace WireMock.FluentAssertions;
+
+public partial class WireMockAssertions
+{
+    [CustomAssertion]
+    public AndConstraint<WireMockAssertions> WitHeaderKey(string expectedKey, string because = "", params object[] becauseArgs)
+    {
+        var (filter, condition) = BuildFilterAndCondition(request =>
+        {
+            return request.Headers?.Any(h => h.Key == expectedKey) == true;
+        });
+
+        Execute.Assertion
+            .BecauseOf(because, becauseArgs)
+            .Given(() => _requestMessages)
+            .ForCondition(requests => _callsCount == 0 || requests.Any())
+            .FailWith(
+                "Expected {context:wiremockserver} to have been called with Header {0}{reason}.",
+                expectedKey
+            )
+            .Then
+            .ForCondition(condition)
+            .FailWith(
+                "Expected {context:wiremockserver} to have been called with Header {0}{reason}, but didn't find it among the calls with Header(s) {1}.",
+                _ => expectedKey,
+                requests => requests.Select(request => request.Headers)
+            );
+
+        _requestMessages = filter(_requestMessages).ToList();
+
+        return new AndConstraint<WireMockAssertions>(this);
+    }
+
+    [CustomAssertion]
+    public AndConstraint<WireMockAssertions> WithHeader(string expectedKey, string value, string because = "", params object[] becauseArgs)
+        => WithHeader(expectedKey, new[] { value }, because, becauseArgs);
+
+    [CustomAssertion]
+    public AndConstraint<WireMockAssertions> WithHeader(string expectedKey, string[] expectedValues, string because = "", params object[] becauseArgs)
+    {
+        var (filter, condition) = BuildFilterAndCondition(request =>
+        {
+            var headers = request.Headers?.ToArray() ?? new KeyValuePair<string, WireMockList<string>>[0];
+
+            var matchingHeaderValues = headers.Where(h => h.Key == expectedKey).SelectMany(h => h.Value.ToArray()).ToArray();
+
+            if (expectedValues.Length == 1 && matchingHeaderValues.Length == 1)
+            {
+                return matchingHeaderValues[0] == expectedValues[0];
+            }
+
+            var trimmedHeaderValues = string.Join(",", matchingHeaderValues.Select(x => x)).Split(',').Select(x => x.Trim()).ToArray();
+            return expectedValues.Any(trimmedHeaderValues.Contains);
+        });
+
+        Execute.Assertion
+            .BecauseOf(because, becauseArgs)
+            .Given(() => _requestMessages)
+            .ForCondition(requests => _callsCount == 0 || requests.Any())
+            .FailWith(
+                "Expected {context:wiremockserver} to have been called with Header {0} and Values {1}{reason}.",
+                expectedKey,
+                expectedValues
+            )
+            .Then
+            .ForCondition(condition)
+            .FailWith(
+                "Expected {context:wiremockserver} to have been called with Header {0} and Values {1}{reason}, but didn't find it among the calls with Header(s) {2}.",
+                _ => expectedKey,
+                _ => expectedValues,
+                requests => requests.Select(request => request.Headers)
+            );
+
+        _requestMessages = filter(_requestMessages).ToList();
+
+        return new AndConstraint<WireMockAssertions>(this);
+    }
+
+    [CustomAssertion]
+    public AndConstraint<WireMockAssertions> WithoutHeaderKey(string unexpectedKey, string because = "", params object[] becauseArgs)
+    {
+        var (filter, condition) = BuildFilterAndCondition(request =>
+        {
+            return request.Headers?.Any(h => h.Key == unexpectedKey) != true;
+        });
+
+        Execute.Assertion
+            .BecauseOf(because, becauseArgs)
+            .Given(() => _requestMessages)
+            .ForCondition(requests => _callsCount == 0 || requests.Any())
+            .FailWith(
+                "Expected {context:wiremockserver} not to have been called with Header {0}{reason}.",
+                unexpectedKey
+            )
+            .Then
+            .ForCondition(condition)
+            .FailWith(
+                "Expected {context:wiremockserver} not to have been called with Header {0}{reason}, but found it among the calls with Header(s) {1}.",
+                _ => unexpectedKey,
+                requests => requests.Select(request => request.Headers)
+            );
+
+        _requestMessages = filter(_requestMessages).ToList();
+
+        return new AndConstraint<WireMockAssertions>(this);
+    }
+
+    [CustomAssertion]
+    public AndConstraint<WireMockAssertions> WithoutHeader(string unexpectedKey, string value, string because = "", params object[] becauseArgs)
+        => WithoutHeader(unexpectedKey, new[] { value }, because, becauseArgs);
+
+    [CustomAssertion]
+    public AndConstraint<WireMockAssertions> WithoutHeader(string unexpectedKey, string[] expectedValues, string because = "", params object[] becauseArgs)
+    {
+        var (filter, condition) = BuildFilterAndCondition(request =>
+        {
+            var headers = request.Headers?.ToArray() ?? new KeyValuePair<string, WireMockList<string>>[0];
+
+            var matchingHeaderValues = headers.Where(h => h.Key == unexpectedKey).SelectMany(h => h.Value.ToArray()).ToArray();
+
+            if (expectedValues.Length == 1 && matchingHeaderValues.Length == 1)
+            {
+                return matchingHeaderValues[0] != expectedValues[0];
+            }
+
+            var trimmedHeaderValues = string.Join(",", matchingHeaderValues.Select(x => x)).Split(',').Select(x => x.Trim()).ToArray();
+            return !expectedValues.Any(trimmedHeaderValues.Contains);
+        });
+
+        Execute.Assertion
+            .BecauseOf(because, becauseArgs)
+            .Given(() => _requestMessages)
+            .ForCondition(requests => _callsCount == 0 || requests.Any())
+            .FailWith(
+                "Expected {context:wiremockserver} not to have been called with Header {0} and Values {1}{reason}.",
+                unexpectedKey,
+                expectedValues
+            )
+            .Then
+            .ForCondition(condition)
+            .FailWith(
+                "Expected {context:wiremockserver} not to have been called with Header {0} and Values {1}{reason}, but found it among the calls with Header(s) {2}.",
+                _ => unexpectedKey,
+                _ => expectedValues,
+                requests => requests.Select(request => request.Headers)
+            );
+
+        _requestMessages = filter(_requestMessages).ToList();
+
+        return new AndConstraint<WireMockAssertions>(this);
+    }
+}