Add tests for helpers

[LucasSantos27]

• commonDetails.py - current: 43%
• database.py - current: 33%
• detailsIssues.py - current: 25%
• discordWebhook.py - current: 35%
• email.py - current: 18%
• errorHandling.py - current: 75%
• filters.py - current: 31%
• hardwareDetails.py - current: 19%
• issueExtras.py - current: 23%
• issueListing.py - current: 59%
• logger.py - current: 31%
• misc.py - current: 30%
• system.py - current: 38%
• treeDetails.py - current: 15%
• trees.py - current: 31%