This test makes sure that using the syntax `delete sessionStorage.keyName` works as an alias to `sessionStorage.removeItem(keyName).`
foo (before anything) is: undefined
foo (after a named property setter set) is: bar
foo (after a delete) is: undefined
foo (after an indexed setter set) is: bar
foo (after deleting FOO (not foo)) is : bar
foo (after a delete) is: undefined
foo (after calling setItem) is: bar
foo (after a delete) is: undefined
foo (after a redundant delete) is: undefined
foo (after a named property setter set) is: bar
foo (after an indexed delete) is: undefined