Refactor current tests to super & subclasses architecture

[Alokxk]

Changes

• Extracted common buffer tests into CTAbstractBufferTest class
• Created CTFIFOBufferTest and CTLIFOBufferTest subclasses
• Refactored tests with CTAbstractBufferTest base class
• Fixed copy method bug

[coveralls]

Pull Request Test Coverage Report for Build 15727099160

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 25 of 25 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 98.238%

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Totals
Change from base Build 15701747297:	0.1%
Covered Lines:	223
Relevant Lines:	227

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 15724913199

Details

• 25 of 25 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 98.238%

---

Totals
Change from base Build 15701747297:	0.1%
Covered Lines:	223
Relevant Lines:	227

---

💛 - Coveralls