Resolve "Add some tests"

Closes #19 (closed)

env_test.yml

+name: bolsonaro
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - joblib=0.14.1=py_0
+  - jupyter=1.0.0=py37_7
+  - numpy=1.17.2=py37haad9e8e_0
+  - pandas=0.25.2=py37he6710b0_0
+  - pip=19.3.1=py37_0
+  - pytest=5.3.5=py37_0
+  - python=3.7.4=h265db76_1
+  - scikit-learn=0.21.3=py37hd81dba3_0
+  - pip:
+    - -e .
+    - coverage==4.5.4
+    - flake8==3.7.9
+    - idna==2.8
+    - ipython==7.9.0
+    - matplotlib==3.1.1
+    - pycodestyle==2.5.0
+    - python-dotenv==0.10.3
+    - requests==2.22.0
+    - sphinx==2.2.1
+    - tqdm==4.37.0
+prefix: /home/l_bouscarrat/miniconda3/envs/bolsonaro
+