Tests are taking too long

It's not a major issue at the moment, but test are currently taking about 2.5 hours. See for example https://github.com/tomchor/Oceanostics.jl/pull/195 This is because tests in Oceanostics have nested loops that test pretty much every combination of grids, closures, etc. In a way that's good because it covers a huge number of cases and combinations, but on the other hand it might be unnecessarily thorough, and as the package grows and tests multiply, this becomes exponentially slow.