test: Reduce requirements

[epage]

Instead of god fixtures, this moves everything to the smallest scope, trying to reduce the number of features being tested

[coveralls]

Pull Request Test Coverage Report for Build 12379917324

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 15 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-1.1%) to 61.873%

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Files with Coverage Reduction	New Missed Lines	%
src/file/mod.rs	2	66.67%
src/file/source/file.rs	2	72.41%
src/error.rs	2	72.22%
src/source.rs	3	57.14%
src/config.rs	6	65.79%

Totals
Change from base Build 12362481169:	-1.1%
Covered Lines:	925
Relevant Lines:	1495

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💛 - Coveralls