New methods for question and template testing

[KarlisJ]

Added methods to fully test questions and FB templates

There are new tests written to see almost all new methods in action.

There will be a conflict with assertTemplate method. Currently it expects second (optional) parameter to be boolean $strict but in this PR it expects a closure. Old "strict" comparison was bad call because it actually does not differ from assertRaw.

[codecov]

Codecov Report

Merging #15 into master will increase coverage by 6.46%.
The diff coverage is 73.55%.

@@             Coverage Diff              @@
##             master      #15      +/-   ##
============================================
+ Coverage     61.81%   68.27%   +6.46%     
- Complexity       73      141      +68     
============================================
  Files             7       12       +5     
  Lines           254      457     +203     
============================================
+ Hits            157      312     +155     
- Misses           97      145      +48

Impacted Files	Coverage Δ	Complexity Δ
src/Testing/TemplateTester.php	100% <100%> (ø)	12 <12> (?)
src/Testing/BotManTester.php	96% <100%> (+4.94%)	42 <5> (+1)	⬆️
src/Testing/ButtonTester.php	53.84% <53.84%> (ø)	13 <13> (?)
src/Testing/ElementButtonTester.php	58.69% <58.69%> (ø)	15 <15> (?)
src/Testing/QuestionTester.php	76.92% <76.92%> (ø)	13 <13> (?)
src/Testing/ElementTester.php	78.57% <78.57%> (ø)	14 <14> (?)
... and 2 more

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[KarlisJ]

For some reason can not get StyleCI to pass. It want to remove and add the same line

[stefro]

This is a great idea! Can this please get merged?