Ref #38 Switch test mechanism

Signed-off-by: Krzysztof Kaźmierczyk <[email protected]>

.travis.yml

@@ -1,10 +1,16 @@
 language: python
 python:
  - "3.9"
-install:
+before_install: install:
  - pip install -r requirements.txt
+ - pip install -U pytest
+ - pip install codecov
+install:
+ - pip install .
 env:
  global:
   - PYTHONPATH=src:test
 script:
- - make test
+ - pytest
+after_success:
+ - codecov