[TwigComponent]: Fix silently failing tests

[adrienlucas]

Q	A
Bug fix? no
New feature? no
Issues	Fix silently failing tests
License	MIT

This tries to fix two little mistakes :

• the expectException should never be used twice in a test (because it does not actually try/catch, the first exception will stop the execution of the test and will be catched outside).
• the piece of code that is expected to throw an exception should always come last in the test (because again, no try/catch, so any line after the throwing line will not be executed).

[smnandre]

Thank you @adrienlucas !

[kbond]

Excellent catch Adrien, thank you!