public async Task UploadImageAsync_given_invalid_file_throws_ArgumentException()
{
var folder = "static";
var error = "Invalid image file";
var fileMock = new Mock <IFormFile>();
//Setup mock file using a memory stream
var content = "Hello World from a Fake File";
var fileName = "test.pdf";
var ms = new MemoryStream();
var writer = new StreamWriter(ms);
writer.Write(content);
writer.Flush();
ms.Position = 0;
fileMock.Setup(_ => _.OpenReadStream()).Returns(ms);
fileMock.Setup(_ => _.FileName).Returns(fileName);
fileMock.Setup(_ => _.Length).Returns(ms.Length);
var imageWriter = new ImageWriter();
var ex = await Assert.ThrowsAsync <ArgumentException>(() => imageWriter.UploadImageAsync(folder, fileMock.Object));
Assert.Equal(error, ex.Message);
}
