Test executable more

[JSAbrahams]

Summary

Bunch of smoke tests to make sure the executable works as intended.

The logic here wasn't really tested much. Now we actually test the command line interface.

In future there should be more tests also for the different arguments. Remember, if we change the behavior anywhere, ideally at least one test should fail.

• Behaviour Executable now gives an error if the source directory, or input file, does not exist.
• Pretty Show relative path (compared to input source) in error message instead of absolute one.

Added Tests

• Test that a target dir is created.
• Test that one can use a custom source.
• Test that one can use a custom target.
• Test that an error is given if the source file does not exist.
• Test that an error is given if the directory does not exist.
• Test compiling of source file instead of dir.
• Test that error message contains relative path not an absolute one.
• Remove link to doc in command line help

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (develop@2014071). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop     #293   +/-   ##
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  Coverage           ?   85.96%           
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  Files              ?       98           
  Lines              ?     9853           
  Branches           ?        0           
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  Hits               ?     8470           
  Misses             ?     1383           
  Partials           ?        0           

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