testContainsTellsYouIfAGivenContextIsInTheCurrentStack()
public method
testFailToSetEmptyContext()
public method
testPeekReturnsTheMostRecentlyPushedContext()
public method
testPopReturnsAndRemovesTheMostRecentlyPushedContext()
public method
testSetReplacesTheMostRecentlyPushedContext()
public method