#338 - added a failing spec
#338 - throw an exception when configuring invisible inaccessible method
:lipstick: fixed typo mehtod -> method
Merge pull request #339 from blairconrad/338-exception-when-attempting-to-fake-an-internal-method

338 exception when attempting to fake an internal method
guarding against null call to fix Code Analysis error
Merge pull request #340 from blairconrad/fix-code-analysis

guarding against null call to fix Code Analysis error