Add documentation.

roentgen/text.py

@@ -95,4 +95,3 @@ def get_text(tags: Dict[str, Any]) -> List[str]:
             format_frequency, tags["frequency"].split(";"))))
 
     return texts
-

test/test_text.py

@@ -1,28 +1,43 @@
 """
 Author: Sergey Vartanov (me@enzet.ru).
 """
+from typing import List
+
 from roentgen.scheme import Scheme
+from roentgen.text import Label
 
 
-def get_text(tags):
+def construct_labels(tags) -> List[Label]:
+    """
+    Construct labels from OSM node tags.
+    """
     scheme = Scheme("scheme/default.yml")
     return scheme.construct_text(tags, True)
 
 
 def test_1_label() -> None:
-    labels = get_text({"name": "Name"})
+    """
+    Test tags that should be converted into single label.
+    """
+    labels = construct_labels({"name": "Name"})
     assert len(labels) == 1
     assert labels[0].text == "Name"
 
 
 def test_1_label_unknown_tags() -> None:
-    labels = get_text({"name": "Name", "aaa": "bbb"})
+    """
+    Test tags with some unknown tags that should be converted into single label.
+    """
+    labels = construct_labels({"name": "Name", "aaa": "bbb"})
     assert len(labels) == 1
     assert labels[0].text == "Name"
 
 
 def test_2_labels() -> None:
-    labels = get_text({"name": "Name", "ref": "5"})
+    """
+    Test tags that should be converted into two labels.
+    """
+    labels = construct_labels({"name": "Name", "ref": "5"})
     assert len(labels) == 2
     assert labels[0].text == "Name"
     assert labels[1].text == "5"