Make a date-stamped test image

testimage.swift

let renderer = UIGraphicsImageRenderer(size: CGSize(width: 400, height: 400))
let image = renderer.image {
    context in
    UIColor.lightGray.setFill()
    UIRectFill(context.format.bounds)
    UIColor.black.set()
    UIRectFrame(context.format.bounds)
    let text = "TEST IMAGE \n\(Date())" as NSString
    let paragraph = NSMutableParagraphStyle()
    paragraph.alignment = .center
    text.draw(in: context.format.bounds.offsetBy(dx: 0, dy: 75), withAttributes: [.paragraphStyle: paragraph, .font: UIFont.systemFont(ofSize: 60)])
}