qt-everywhere-src-5.14.1/qtdeclarative/tests/auto/qmltest/qqmlbinding/tst_binding.qml

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import QtQuick 2.0
import QtTest 1.1

Rectangle {
    id: screen
    width: 320; height: 240
    property string text
    property bool changeColor: false

    Text { id: s1; text: "Hello" }
    Rectangle { id: r1; width: 1; height: 1; color: "yellow" }
    Rectangle { id: r2; width: 1; height: 1; color: "red" }

    Binding { target: screen; property: "text"; value: s1.text; id: binding1 }
    Binding { target: screen; property: "color"; value: r1.color }
    Binding { target: screen; property: "color"; when: screen.changeColor == true; value: r2.color; id: binding3 }

    TestCase {
        name: "Binding"

        function test_binding() {
            compare(screen.color, "#ffff00")    // Yellow
            compare(screen.text, "Hello")
            verify(!binding3.when)

            screen.changeColor = true
            compare(screen.color, "#ff0000")    // Red

            verify(binding1.target == screen)
            compare(binding1.property, "text")
            compare(binding1.value, "Hello")
        }
    }
}