Add some tests for DOI extraction

Author: rgieseke

.github/workflows/main.yml

@@ -32,6 +32,8 @@ jobs:
     - name: Very basic CLI test
       run: |
         cite --help
+    - name: Pytest
+        pytest tests
 
   deploy-pypi:
     needs: test

dev-requirements.txt

@@ -3,3 +3,4 @@ twine>=1.11.0
 wheel>=0.31.0
 flake8
 black
+pytest

tests/__init__.py

@@ -0,0 +1,12 @@
+from cite import _extract_doi
+
+def test_doi_only():
+    assert _extract_doi("10.1103/physrev.48.73") == "10.1103/physrev.48.73"
+
+def test_doi_prefix():
+    assert _extract_doi("doi:10.1103/physrev.48.73") == "10.1103/physrev.48.73"
+
+def test_doi_url():
+    assert _extract_doi("http://doi.org/10.1103/physrev.48.73") == "10.1103/physrev.48.73"
+    assert _extract_doi("https://doi.org/10.1103/physrev.48.73") == "10.1103/physrev.48.73"
+    assert _extract_doi("doi.org/10.1103/physrev.48.73") == "10.1103/physrev.48.73"