Handle trailing comments in mapping file (#123)

Ensures mapping file entries such as the following are handled:

```
key: value # inline comment for the line here
```

Furthermore, add ruff as a dev dependency so automatic formatting of
snapshots actually works.

Author: pederhan

pyproject.toml

@@ -44,6 +44,7 @@ test = [
     "pytest-timeout>=2.2.0",
     "hypothesis>=6.62.1",
     "inline-snapshot>=0.14.0",
+    "ruff>=0.12.5",
 ]
 
 [project.urls]

tests/test_utils.py

@@ -12,6 +12,7 @@
 from hypothesis import given
 from hypothesis import settings
 from hypothesis import strategies as st
+from inline_snapshot import snapshot
 from pytest import LogCaptureFixture
 from zabbix_auto_config import utils
 from zabbix_auto_config.pyzabbix.types import HostTag
@@ -41,44 +42,49 @@ def test_is_valid_ip(ip_address: Union[IPv4Address, IPv6Address]):
 def test_read_map_file(tmp_path: Path, caplog: pytest.LogCaptureFixture):
     tmpfile = tmp_path / "map.txt"
     tmpfile.write_text(
-        "\n".join(
-            [
-                "a:1",
-                "b:2,3",
-                "invalid line here",  # warning (no colon)
-                "c:4",
-                "d:5",
-                "e:",
-                "f: ",
-                "g:,",
-                "# this is a comment",  # ignored (comment)
-                "h:6,",
-                "h:6",  # duplicate key+value
-                "i:7:8",  # colon in value (allowed)
-                "j:9,9,10",  # duplicate values
-                "k :11,12,13",  # trailing whitespace in key
-                "l: 14 , 15,16 ",  # leading and trailing whitespace in values
-                "l:17",  # duplicate key (extends existing values)
-                "",  # ignored (empty line)
-            ]
-        ),
+        """\
+a:1
+b:2,3
+invalid line here # WARNING: no colon
+c:4
+d:6
+e:  # WARNING: no value after colon
+f:  # WARNING: no value
+g:,  # WARNING: no value + trailing comma
+# this is a comment # IGNORED: comment
+h:6,    # OK: trailing comma
+h:6     # WARNING: duplicate key+value
+i:7:8   # OK: colon in value
+j:9,9,10 # WARNING: duplicate values
+k :11,12,13 # OK: whitespace before colon
+l: 14 , 15,16 # OK: leading and trailing whitespace in values
+l:17 # WARNING: duplicate key (extends existing values)
+
+# More complex cases
+Spaces in key: Spaces in values, are, ok
+""",
         encoding="utf-8",
     )
 
     with caplog.at_level(logging.WARNING):
         m = utils.read_map_file(tmpfile)
 
-    assert m == {
-        "a": ["1"],
-        "b": ["2", "3"],
-        "c": ["4"],
-        "d": ["5"],
-        "h": ["6"],
-        "i": ["7:8"],
-        "j": ["9", "10"],
-        "k": ["11", "12", "13"],
-        "l": ["14", "15", "16", "17"],
-    }
+    assert m == snapshot(
+        {
+            "a": ["1"],
+            "b": ["2", "3"],
+            "c": ["4"],
+            "d": ["6"],
+            "h": ["6"],
+            "i": ["7:8"],
+            "j": ["9", "10"],
+            "k": ["11", "12", "13"],
+            "l": ["14", "15", "16", "17"],
+            "Spaces in key": ["Spaces in values", "are", "ok"],
+        }
+    )
+
+    # Test logging output
     invalid_lines_contain = [
         "'invalid line here'",
         "'e:'",
@@ -97,7 +103,7 @@ def test_read_map_file(tmp_path: Path, caplog: pytest.LogCaptureFixture):
         "line 16",
     ]
     for phrase in invalid_lines_contain:
-        assert phrase in caplog.text
+        assert phrase in caplog.text, f"Expected '{phrase}' in log output {caplog.text}"
     assert caplog.text.count("WARNING") == 8