Updated test with HttpContext check

Author: StickFun

src/Http/Http.Extensions/test/RequestDelegateFactoryTests.cs

@@ -688,7 +688,10 @@ public async Task RequestDelegateHandlesNullableStringValuesFromExplicitQueryStr
     public async Task RequestDelegateHandlesFromFormStringArrayParameter()
     {
         var httpContext = CreateHttpContext();
-        httpContext.Request.Form = new FormCollection(null);
+        httpContext.Request.Form = new FormCollection(new Dictionary<string, StringValues>
+        {
+            ["form"] = new(new[] { "1", "2", "3" })
+        });
 
         var factoryResult = RequestDelegateFactory.Create(
             (HttpContext context, [FromForm(Name = "form")] string[] formValues) =>
@@ -700,12 +703,7 @@ public async Task RequestDelegateHandlesFromFormStringArrayParameter()
 
         await requestDelegate(httpContext);
 
-        var parameterBindingMetadata = factoryResult.EndpointMetadata
-            .FirstOrDefault(e => e is ParameterBindingMetadata metadata &&
-                metadata.Name == "formValues") as ParameterBindingMetadata;
-
-        Assert.NotNull(parameterBindingMetadata);
-        Assert.Equal(typeof(string[]), parameterBindingMetadata.ParameterInfo.ParameterType);
+        Assert.Equal(new StringValues(new[] { "1", "2", "3" }), httpContext.Items["form"]!);
     }
 
     [Fact]