Sometimes it is necessary to perform mathematical calculations in QF-Test, e.g. in order to calculate the expected height of a GUI element in dependence of the complete window size or the exact clicking position for a mouse click.
In order to do so we can use a Scripting node. Alternatively it is possible to use the $[some mathematical expression] expression within node attributes. Like this the expression $[3 + 3] will be replaced by 6. When we have stored the width of a current element in a QF-Test variable named « canvasWidth », we can use $[$(canvasWidth) – 1] in order to click somewhere at the right border of a GUI element:
In fact the mathematical expression in the brackets is passed to a Jython eval statement. So it is also possible to perform more sophisticated operations within such an « $[…] » expression:
$["Hello World"[1:5]]will be replaced by « ello ».$[rc.getLanguageName()]will be replaced by « jython ».$[re.split("\\d*", "foo123bar4foobar")[1]]will be replaced by « bar ». Please note, this statement will only work if you have previously executed a Jython Server Script that imports the re-module.$[__import__('re').split("\\d*", "foo123bar4foobar")[1]]will be replaced by « bar » (this statement will work whether a Jython Server Script that imports the re-module has been executed or not).