Added unit test for handling string array from form parameter

Author: StickFun

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

@@ -684,6 +684,30 @@ public async Task RequestDelegateHandlesNullableStringValuesFromExplicitQueryStr
         Assert.Null(httpContext.Items["form"]);
     }
 
+    [Fact]
+    public async Task RequestDelegateHandlesFromFormStringArrayParameter()
+    {
+        var httpContext = CreateHttpContext();
+        httpContext.Request.Form = new FormCollection(null);
+
+        var factoryResult = RequestDelegateFactory.Create(
+            (HttpContext context, [FromForm(Name = "form")] string[] formValues) =>
+        {
+            context.Items["form"] = formValues;
+        });
+
+        var requestDelegate = factoryResult.RequestDelegate;
+
+        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);
+    }
+
     [Fact]
     public async Task RequestDelegateCanAwaitValueTasksThatAreNotImmediatelyCompleted()
     {