MAINT: adapted organization of unit tests to caosdb pylib structure

provenance.yml

+!!python/object/apply:collections.defaultdict
+args:
+- !!python/name:newcrawler.crawl.%3Clambda%3E ''
+dictitems:
+  Measurement:
+    date: !!python/tuple
+    - - SimulationData
+      - 2020_climate-model-predict
+      - '2020-02-01'
+    - - SimulationData
+      - project_dir
+      - measurement
+    description: !!python/tuple
+    - - SimulationData
+      - 2020_climate-model-predict
+      - '2020-02-01'
+      - README.md
+      - description
+    - - SimulationData
+      - project_dir
+      - measurement
+      - README
+      - description
+    identifier: !!python/tuple
+    - - SimulationData
+      - 2020_climate-model-predict
+      - '2020-02-01'
+    - - SimulationData
+      - project_dir
+      - measurement
+    project: !!python/tuple
+    - - SimulationData
+      - 2020_climate-model-predict
+      - '2020-02-01'
+    - - SimulationData
+      - project_dir
+      - measurement
+    responsible: !!python/tuple
+    - - SimulationData
+      - 2020_climate-model-predict
+      - '2020-02-01'
+      - README.md
+      - responsible
+    - - SimulationData
+      - project_dir
+      - measurement
+      - README
+      - responsible_single
+  Person:
+    first_name: !!python/tuple
+    - - SimulationData
+      - 2020_climate-model-predict
+      - '2020-02-01'
+      - README.md
+      - responsible
+    - - SimulationData
+      - project_dir
+      - measurement
+      - README
+      - responsible_single
+    last_name: !!python/tuple
+    - - SimulationData
+      - 2020_climate-model-predict
+      - '2020-02-01'
+      - README.md
+      - responsible
+    - - SimulationData
+      - project_dir
+      - measurement
+      - README
+      - responsible_single
+  Project:
+    date: !!python/tuple
+    - - SimulationData
+      - 2020_climate-model-predict
+    - - SimulationData
+      - project_dir
+    identifier: !!python/tuple
+    - - SimulationData
+      - 2020_climate-model-predict
+    - - SimulationData
+      - project_dir

pytest.ini

+[pytest]
+testpaths=unittests
+addopts=-x -vv --cov=caosdb

tox.ini

+[tox]
+envlist=py36, py37, py38, py39
+skip_missing_interpreters = true
+
+[testenv]
+deps = .
+    pytest
+    pytest-cov
+commands=py.test --cov=caosdb -vv {posargs}