Fix/few more tests

[inkhey]

Add few more test.
Need #80, #82, #79, #66, #77

[coveralls]

Pull Request Test Coverage Report for Build 228

• 307 of 308 (99.68%) changed or added relevant lines in 11 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+2.0%) to 81.032%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tracim/command/user.py	16	17	94.12%

Files with Coverage Reduction	New Missed Lines	%
tracim/models/context_models.py	1	97.83%

Totals
Change from base Build 213:	2.0%
Covered Lines:	5306
Relevant Lines:	6548

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💛 - Coveralls