use a test data generator for specfic test cases?

[cehbrecht]

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Description

Currently our test-data is prepared from real data. We need to reduce the test-data and might loose some of the imperfections of the real data, like level values 1000.00000001.

We could add a test-data generator which produces test-data for specific test-cases. It could use a real netcdf file as source (cordex, cmip6, cmip5) and modify specific values ... or just generate simulated data.

This could also reduce the amount of test-data we need and makes it easier to add new tests.

What I Did

I have no test-data for level patches in PR #265 and #262.