Add tests requirements and tox.ini

.travis.yml

@@ -6,6 +6,7 @@ python:
   - "3.8"
   - "3.9"
 install:
+  - pip install -r requirements.txt
   - python setup.py install
 script:
   - ./start.sh --data-dir /tmp --connection-limit 16 &

requirements.txt

@@ -0,0 +1,2 @@
+coverage
+psutil

tox.ini

@@ -0,0 +1,25 @@
+[tox]
+envlist = reset,py{37,38,39},stats
+skip_missing_interpreters = true
+
+[testenv]
+deps = -rrequirements.txt
+commands =
+    coverage run -a -m tests
+
+[testenv:reset]
+commands = coverage erase
+
+[testenv:stats]
+commands =
+    coverage report
+    coverage xml
+
+[coverage:run]
+source = minode
+omit =
+     tests.py
+     */tests/*
+
+[coverage:report]
+ignore_errors = true