test: umfangreiche Testdaten (alle Dateitypen + Mail-Anhaenge)

- oCIS /testdata/: Bilder (jpg/png/webp/bmp/gif/tiff/svg), Audio (mp3/ogg/m4a/
  flac/wav), Video (mp4), PDFs (Text + Scan), Office (docx/xlsx/pptx), Text/Daten
  (md/txt/csv/json/xml/yaml/html/py/vcf/ics), Archive (zip/tar.gz).
- Maildir: Mails mit diversen Anhaengen (PDF/Bild/Word/Excel/MP3/MP4/PPTX/ZIP).
- TestFileTypes: read_file je Typ -> Content-Typ pruefen (image/text/resource).
- Generatoren tests/testdata/gen_testfiles.py + gen_maildir.py + upload_ocis.sh.
68 Tests gruen (vorher 54). Doku in MCPTEST.md.

tests/test_all.py

@@ -421,3 +421,37 @@ class TestNotes:
         # Verify it appears in the notebook listing
         listing = tool_call(self.PORT, token, "list_notes", {"notebook": self.TEST_NOTEBOOK})
         assert note_id in listing or f"Test Note {tag}" in listing
+
+
+# ============================================================
+# File Type Tests (read_file auf vorbereiteten /testdata-Dateien)
+# ============================================================
+
+class TestFileTypes:
+    """Liest die mcptest-Testdaten verschiedener Typen und prueft den Content-Typ."""
+    PORT = SERVERS["files"]
+
+    CASES = [
+        ("testdata/images/photo.jpg",        {"image"}),
+        ("testdata/images/screenshot.png",   {"image"}),
+        ("testdata/images/logo.svg",         {"image"}),
+        ("testdata/text/notes.txt",          {"text"}),
+        ("testdata/text/readme.md",          {"text"}),
+        ("testdata/text/data.csv",           {"text"}),
+        ("testdata/documents/document.pdf",  {"text"}),            # Text-PDF -> extrahiert
+        ("testdata/documents/scanned.pdf",   {"text", "resource"}),# Scan-PDF
+        ("testdata/documents/report.docx",   {"text"}),
+        ("testdata/documents/budget.xlsx",   {"text"}),
+        ("testdata/documents/slides.pptx",   {"text"}),
+        ("testdata/audio/tone.mp3",          {"resource"}),
+        ("testdata/video/clip.mp4",          {"resource"}),
+        ("testdata/archives/archive.zip",    {"resource"}),
+    ]
+
+    @pytest.mark.parametrize("path,expected", CASES)
+    def test_read_file_type(self, path, expected):
+        token = get_token(self.PORT)
+        result = mcp_call(self.PORT, token, "tools/call",
+                          {"name": "read_file", "arguments": {"path": path}})
+        types = {c["type"] for c in result["result"]["content"]}
+        assert types & expected, f"{path}: erwartet eins von {expected}, bekam {types}"