ValueRangeConstraint Item¶

class ValueRangeConstraint¶: Checks whether a property is in a certain range.

Inherits:	`Component`
Properties:	`enabled`, `evaluateOnFinished`, `evaluateOnValidation`, `maxValue` `minValue`, `valid`, `value`

Detailed Description¶

ValueRangeConstraint checks whether value is within a range given by minValue and maxValue.

The constraint has two stages: validation and evaluation. Validation happens immediately after the value property has changed. Whether value is within the expected range, can be seen at the property valid.

During the evaluation stage, it is decided whether the test case is aborted. Evaluation can either happen immediately after validation (evaluateOnValidation is true) or just before the Testcase::finished() event (evaluateOnFinished is true). The enabled property switches measurement completely on and off.

Example for measuring the duration between two signals:

import qst 1.0
import QtQml 2.0 as QtQml

Testcase {

    QtQml.Timer {
        id: timer
        repeat: true
        interval: 123

        onTriggered: adc.start
    }

    AdcProbe {
        id: adc
        ioid: 23
    }

    ValueRangeConstraint {
        id: constraint
        minValue: 100
        maxValue: 300

        value: adc.value
    }

    function run() {
        timer.start
        Qst.wait(4000)
    }

Properties¶

bool enabled¶

Default:	`true`

When false, the value property does not have any effect and the constraint is neither validated nor evaluated.

bool evaluateOnFinished¶

Default:	false

If true, the constraint will be evaluated by Qst just before Testcase::finished().