Mock calls to plantuml to reduce CI fragility platforms #669
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As described in #667, calls to and external server for rendering PlantUML introduced fragility to the CI. On the first attempt to fix this issue by including a local copy of PlantUML, it also became clear that it was very hard to get PlantUML to produce exactly duplicate output over different platforms.
This makes the test faster and more robust by simply mocking out the plantuml-markdown execution.