Resolve "Add some tests"

Closes #19 (closed)

.gitlab-ci.yml

+image: 'continuumio/miniconda:4.7.12'
+
+before_script:
+    - conda create -f env.yml
+    - conda activate bolsonaro
+    
+test:
+    script:
+        - pytest tests/
\ No newline at end of file