Add tests for https://gitlab.com/caosdb/caosdb-server/-/issues/145

Summary

Tests for caosdb-server!62 (merged) (https://gitlab.com/caosdb/caosdb-server/-/issues/145) and also https://gitlab.com/caosdb/caosdb-server/-/issues/147

Please merge together with caosdb-server!62 (merged)

Focus

The MR caosdb-server!62 (merged) proposed to remove the "casting to integer". These tests show that that would be a bug and also test the fix for https://gitlab.com/caosdb/caosdb-server/-/issues/145

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