feat(vwb): add dashboard competence testing and health tools

tests/unit/test_ocr_extractor_tesseract.py

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+from pathlib import Path
+import sys
+from types import SimpleNamespace
+
+from PIL import Image
+
+import core.llm.ocr_extractor as ocr_extractor
+
+
+def _blank_png(path: Path) -> None:
+    Image.new("RGB", (120, 40), "white").save(path)
+
+
+def test_extract_digits_tesseract_filters_numeric_pattern(tmp_path, monkeypatch):
+    image_path = tmp_path / "screen.png"
+    _blank_png(image_path)
+
+    def fake_image_to_string(_img, lang, config):
+        assert lang == "eng"
+        assert "tessedit_char_whitelist=0123456789" in config
+        return "IPP 25003284 MOREL\n25003362 abc 1234\n25012257"
+
+    monkeypatch.setitem(
+        sys.modules,
+        "pytesseract",
+        SimpleNamespace(image_to_string=fake_image_to_string),
+    )
+
+    values = ocr_extractor.extract_digits_tesseract_from_image(
+        str(image_path),
+        pattern=r"^25\d{6}$",
+    )
+
+    assert values == ["25003284", "25003362", "25012257"]
+
+
+def test_extract_table_tesseract_engine_delegates_to_digits(tmp_path, monkeypatch):
+    image_path = tmp_path / "screen.png"
+    _blank_png(image_path)
+
+    calls = {}
+
+    def fake_extract_digits(image_path_arg, region=None, pattern=None, limit=None):
+        calls["args"] = (image_path_arg, region, pattern, limit)
+        return ["25003284", "25003362"]
+
+    monkeypatch.setattr(
+        ocr_extractor,
+        "extract_digits_tesseract_from_image",
+        fake_extract_digits,
+    )
+
+    values = ocr_extractor.extract_table_from_image(
+        str(image_path),
+        region=(10, 20, 30, 40),
+        pattern=r"^25\d{6}$",
+        limit=2,
+        engine="tesseract",
+    )
+
+    assert values == ["25003284", "25003362"]
+    assert calls["args"] == (str(image_path), (10, 20, 30, 40), r"^25\d{6}$", 2)