Test/env error cases

[dittrichlucas]

Description

This PR adds the error test cases to the env commands.

Close #981

How to verify it

Checking the env command test workflow.

Changelog

Add error test cases to env commands

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This pull request generated the following artifacts.

To test the health and quality of this implementation, download the respective binary for your operating system, unzip and directly run the binary like the examples below.

• Windows
  Download the file: rit-windows.zip
  Unzip to some folder like: C:\home\user\downloads\pr1054
  Access the folder: cd C:\home\user\downloads\pr1054
  Directly call the binary: .\rit.exe --version or .\rit.exe name of formula

• Linux
  Download the file: rit-linux.zip
  Unzip to some folder like: /home/user/downloads/pr1054
  Access the folder: cd /home/user/downloads/pr1054
  Assign execute permission to binary: chmod +x ./rit
  Directly call the binary: ./rit --version or ./rit name of formula

• MacOS
  Download the file: rit-macos.zip
  Unzip to some folder like: /home/user/downloads/pr1054
  Access the folder: cd /home/user/downloads/pr1054
  Assign execute permission to binary: chmod +x ./rit
  Directly call the binary: ./rit --version or ./rit name of formula

Generated at Thu Oct 28 2021 03:02:08 GMT+0000 (Coordinated Universal Time)

[codecov-commenter]

Codecov Report

Merging #1054 (acb1967) into main (5580033) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1054   +/-   ##
=======================================
  Coverage   84.10%   84.10%           
=======================================
  Files         123      123           
  Lines        4982     4982           
=======================================
  Hits         4190     4190           
  Misses        518      518           
  Partials      274      274           

Flag	Coverage Δ
unittests	84.10% <ø> (ø)

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