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var ScriptContext = javax.script.ScriptContext;
if (key == undefined || key != 'engine value') {
throw "unexpected engine scope value";
}
// pre-defined context variable refers to current ScriptContext
if (context.getAttribute('key', ScriptContext.GLOBAL_SCOPE) != 'global value') {
throw "unexpected global scope value";
}
// change the engine scope value
key = 'new engine value';
if (context.getAttribute('key', ScriptContext.GLOBAL_SCOPE) != 'global value') {
throw "global scope should not change here";
}
// delete engine scope value
delete key;
if (key == undefined && key != 'global value') {
throw 'global scope should be visible after engine scope removal';
}
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