check errors in test suite

[HaraldNordgren]

It's bad to skip error checking. Would also be good to have a linter for this.

[prodsecmachine]

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💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.

[HaraldNordgren]

Ping @Anaethelion @Jakub-Kapusta