Verify that the compartment exists in a model
assertCompartmentExists(ui, x)
testCompartmentExists(ui, x)the value of the compartment that exists; if it is a vector returns the first item that matches
testCompartmentExists(): Test if compartment exists
Other Assertions:
assertCompartmentName(),
assertCompartmentNew(),
assertRxUi(),
assertVariableExists(),
assertVariableNew(),
testIniDf(),
testRxUnbounded()