// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Primitives;
 
namespace Microsoft.AspNetCore.Mvc.ModelBinding;
 
public class FormFileValueProviderTest
{
    [Fact]
    public void ContainsPrefix_ReturnsFalse_IfFileIs0LengthAndFileNameIsEmpty()
    {
        // Arrange
        var httpContext = new DefaultHttpContext();
        httpContext.Request.ContentType = "multipart/form-data";
        var formFiles = new FormFileCollection();
        formFiles.Add(new FormFile(Stream.Null, 0, 0, "file", fileName: null));
        httpContext.Request.Form = new FormCollection(new Dictionary<string, StringValues>(), formFiles);
 
        var valueProvider = new FormFileValueProvider(formFiles);
 
        // Act
        var result = valueProvider.ContainsPrefix("file");
 
        // Assert
        Assert.False(result);
    }
 
    [Fact]
    public void ContainsPrefix_ReturnsTrue_IfFileExists()
    {
        // Arrange
        var httpContext = new DefaultHttpContext();
        httpContext.Request.ContentType = "multipart/form-data";
        var formFiles = new FormFileCollection();
        formFiles.Add(new FormFile(Stream.Null, 0, 10, "file", "file"));
        httpContext.Request.Form = new FormCollection(new Dictionary<string, StringValues>(), formFiles);
 
        var valueProvider = new FormFileValueProvider(formFiles);
 
        // Act
        var result = valueProvider.ContainsPrefix("file");
 
        // Assert
        Assert.True(result);
    }
 
    [Fact]
    public void GetValue_ReturnsNoneResult()
    {
        // Arrange
        var httpContext = new DefaultHttpContext();
        httpContext.Request.ContentType = "multipart/form-data";
        var formFiles = new FormFileCollection();
        formFiles.Add(new FormFile(Stream.Null, 0, 10, "file", "file"));
        httpContext.Request.Form = new FormCollection(new Dictionary<string, StringValues>(), formFiles);
 
        var valueProvider = new FormFileValueProvider(formFiles);
 
        // Act
        var result = valueProvider.GetValue("file");
 
        // Assert
        Assert.Equal(ValueProviderResult.None, result);
    }
}