test: add test suite (#7)

* add pre-commit hook
* improve logging of inconsistent data

tests/encoding.py

@@ -0,0 +1,30 @@
+from geoclustering.clustering import cluster_locations
+from geoclustering.encoding import encode_clusters
+from tests.helpers import read_fixture_csv, read_fixture_content
+
+
+df = read_fixture_csv("clustering.csv")
+
+
+def test_encoders():
+    clusters = {
+        0: [
+            {"id": 1, "name": "Alice", "lat": 52.523955, "lon": 13.442362},
+            {"id": 2, "name": "Bob", "lat": 52.526659, "lon": 13.448097},
+        ],
+        1: [
+            {"id": 3, "name": "Carol", "lat": 52.525626, "lon": 13.419246},
+            {
+                "id": 4,
+                "name": "Dan",
+                "lat": 52.52443559865125,
+                "lon": 13.41261723049818,
+            },
+        ],
+    }
+
+    res = encode_clusters(clusters)
+
+    assert res["string"] == read_fixture_content("snapshots/result.txt")
+    assert res["json"] == read_fixture_content("snapshots/result.json")
+    assert res["geojson"] == read_fixture_content("snapshots/result.geojson")