chore: remove ATKIS Basis DLM test datasets and streamline test data configuration

.gitignore

@@ -43,6 +43,16 @@ test/*.gpkg
 coverage.xml
 htmlcov/
 
+# === Testdaten: Sidecar-Dateien, die QGIS/GDAL beim Lesen selbst anlegt ===
+# Testdaten/ selbst ist bewusst eingecheckt (siehe docs/test-strategy.md),
+# aber diese Dateien entstehen erst beim Testlauf und gehoeren nicht ins Repo.
+*.qix
+*.shp.xml
+Testdaten/**/*.gpkg
+
+# Ablage fuer aussortierte Testdaten, die noch nicht geloescht wurden.
+_to_delete/
+
 # === QGIS Plugin generierte Dateien ===
 # Kompilierte Übersetzungen (*.qm) sind Build-Artefakte aus i18n/*.ts.
 # resources.py wird bewusst NICHT ignoriert - siehe Hinweis unten.

docs/README.md

@@ -79,8 +79,9 @@ via IBTool's own **Check** button) stay outside the plugin.
 
 ## Out of Scope
 
-- **`Part` (partitioning layer)** — produced by a separate, dedicated
-  tool; Data Wizard doesn't touch it.
+- **`Part` (partitioning layer)** — produced by the sibling plugin
+  **[IB-Tool (Partitioning)](https://github.com/IB-Tool/ibtoolpartion)**;
+  Data Wizard doesn't touch it.
 - **Filter file** — a separately maintained, largely static file; Data
   Wizard doesn't touch it.
 - **Validation** — Data Wizard does not re-implement IBTool's

test/config.py

@@ -1,12 +1,31 @@
+"""Central test configuration for Data Wizard.
+
+Single source of truth for two things:
+
+1. The local QGIS bootstrap (``apply_qgis_environment``), applied from
+   ``test/__init__.py`` before anything imports ``qgis``.
+2. The location of the committed test data under ``Testdaten/`` and the
+   ``requires_atkis_testdaten`` skip marker derived from it.
+
+Everything path-related is driven by ``test_config.ini`` so the layout is
+declared in exactly one place. Test modules must not re-derive these paths —
+import them from here instead.
+"""
+
 import configparser
 import os
 import sys
 from pathlib import Path
 
+import pytest
+
 CONFIG_FILE = Path(__file__).parent / 'test_config.ini'
 
 parser = configparser.ConfigParser()
-parser.read(CONFIG_FILE)
+# Explicit UTF-8: the [testdata] paths contain umlauts ("ALKIS Gebäude"), and
+# configparser would otherwise fall back to the platform encoding (cp1252 on
+# Windows), which makes the file non-portable.
+parser.read(CONFIG_FILE, encoding='utf-8')
 
 QGIS_PREFIX_PATH = parser.get('qgis', 'prefix_path', fallback=r'C:\\Program Files\\QGIS 3.40.0')
 
@@ -26,3 +45,48 @@ def apply_qgis_environment():
         p_str = str(p)
         if os.path.exists(p_str) and p_str not in sys.path:
             sys.path.insert(0, p_str)
+
+
+# ---------------------------------------------------------------------------
+# Committed test data (Testdaten/)
+# ---------------------------------------------------------------------------
+
+#: Root of the committed test data.
+TESTDATEN_DIR = PROJECT_ROOT / parser.get('testdata', 'dir', fallback='Testdaten')
+
+#: Folder holding the flat ATKIS Basis-DLM shapefiles. processor._load_shp
+#: does not search recursively, so this must be the folder that directly
+#: contains ver01_l.shp etc. — it is what gets passed as source_dir.
+ATKIS_DIR = TESTDATEN_DIR / parser.get(
+    'testdata', 'atkis_subdir', fallback='ATKIS Basis DLM dataset')
+
+#: Building footprint file passed as hu_path.
+HU_SHP = TESTDATEN_DIR / parser.get(
+    'testdata', 'hu_file', fallback='ALKIS Gebäude/GebauedeBauwerk.shp')
+
+#: The seven ATKIS source layers processor.process_atkis reads. Keep in sync
+#: with processor._process_rn / _process_aux.
+ATKIS_LAYERS = ('ver01_l', 'ver02_l', 'ver03_l', 'veg02_f', 'veg03_f',
+                'gew01_f', 'gew01_l')
+
+#: True when the full extract is present and the end-to-end tests can run.
+ATKIS_DATA_AVAILABLE = (
+    ATKIS_DIR.is_dir()
+    and all((ATKIS_DIR / f'{name}.shp').exists() for name in ATKIS_LAYERS)
+    and HU_SHP.exists()
+)
+
+TESTDATA_SKIP_REASON = (
+    f"Test data incomplete - expected the seven ATKIS layers in {ATKIS_DIR} "
+    f"and the building footprints at {HU_SHP}. See docs/test-strategy.md."
+)
+
+#: Shared skip marker for every test that needs the real ATKIS/ALKIS extract.
+requires_atkis_testdaten = pytest.mark.skipif(
+    not ATKIS_DATA_AVAILABLE, reason=TESTDATA_SKIP_REASON)
+
+
+def missing_atkis_layers():
+    """Return the ATKIS layer names absent from ATKIS_DIR (empty when complete)."""
+    return [name for name in ATKIS_LAYERS
+            if not (ATKIS_DIR / f'{name}.shp').exists()]

test/test_config.ini

@@ -1,2 +1,16 @@
+; Local test configuration for Data Wizard (UTF-8).
+;
+; [qgis] is only consulted for local runs; the Docker image sets
+; QGIS_PREFIX_PATH=/usr itself.
+;
+; [testdata] declares the layout of the committed Testdaten/ folder. This is
+; the single place where those paths are defined - test/config.py reads them
+; and test modules import the resulting constants from there.
+
 [qgis]
 prefix_path = C:\\Program Files\\QGIS 3.40.0
+
+[testdata]
+dir = Testdaten
+atkis_subdir = ATKIS Basis DLM dataset
+hu_file = ALKIS Gebäude/GebauedeBauwerk.shp