Some UT refacto for class N
Some UT refacto for class N
Some UT refacto for class N
Class A: Fix bug about last but one
Class C: new magic getters added

See #43
Class S: new magic getters to casting

See #43
Class C: missing unit test

See #43
Class S: missing test

See #43
Class N: added magic getter for casting

See #43
Class A: new magic getter for casting

See #43
Class H: new magic getters for casting

See #43