This is my case:
let passwordSecureTextField = app.secureTextFields[\"password\"]
passwordSecureTextField.tap()
passwordSecureTextField.typeText(\"wrong_pass
func pasteTextFieldText(app:XCUIApplication, element:XCUIElement, value:String, clearText:Bool) {
// Get the password into the pasteboard buffer
UIPasteboard.generalPasteboard().string = value
// Bring up the popup menu on the password field
element.tap()
if clearText {
element.buttons["Clear text"].tap()
}
element.doubleTap()
// Tap the Paste button to input the password
app.menuItems["Paste"].tap()
}