Trying to test a QML type registered fro Python

Output

(venv) ~ $ python test_qml.py 
QQmlApplicationEngine failed to load component
:27 Type TestCase unavailable
file:///home/siecje/venv/lib/python3.5/site-packages/PyQt5/Qt/qml/QtTest/TestCase.qml:43 module "Qt.test.qtestroot" is not installed

test_qml.py

#!/usr/bin/env python
import sys

from PyQt5 import Qt, QtCore, QtGui, QtQml, QtWidgets


class OutputType(QtCore.QObject):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.output = ""

    @QtCore.pyqtSlot()
    def ChangeOutput(self):
        self.output = "Hello"

QML = b"""
import QtQuick 2.0
import QtQuick.Controls 1.4
import QtTest 1.1

import OutputType 1.0

Item {
    width: 800
    height: 600
    visible: true

    OutputType {
        id: outputType
    }

    Text {
        id: txt
        text: outputType.output
    }
    Button {
        id: btn
        onClicked: {
            outputType.ChangeOutput()
        }
    }
    TestCase {
      name: "MouseTests"
      function test_clicked(){
          compare(txt.text, "")
          btn.clicked()
          compare(txt.text, "Hello")
      }
    }
}
"""

app = QtWidgets.QApplication(sys.argv + ["-nograb"])
QtQml.qmlRegisterType(OutputType, 'OutputType', 1, 0, 'OutputType')
engine = QtQml.QQmlApplicationEngine()
engine.loadData(QML)
sys.exit(app.exec_())