/// <summary>
/// evaluate R script and assert if the expectation is not found in global environment
/// </summary>
public async Task <IRSessionDataObject> EvaluateAndAssert(
string rScript,
VariableExpectation expectation,
Action <IRSessionDataObject, VariableExpectation> assertAction)
{
await EvaluateAsync(rScript);
var children = await _globalEnv.GetChildrenAsync();
// must contain one and only expectation in result
var evaluation = children.First(v => v.Name == expectation.Name);
assertAction(evaluation, expectation);
return(evaluation);
}
