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+"""
+Tests for Mnemosyne — The Living Holographic Archive.
+
+Round-trip: ingest sample docs → query → verify results.
+"""
+
+import json
+import os
+import tempfile
+import pytest
+
+# Add parent to path for imports
+import sys
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from mnemosyne.ingest import (
+    chunk_text, ingest_text, ingest_file, ingest_directory,
+    get_stats, get_db,
+)
+from mnemosyne.index import keyword_search, query, list_documents, get_document
+
+
+@pytest.fixture
+def db_path(tmp_path):
+    """Temporary database for each test."""
+    return str(tmp_path / "test_mnemosyne.db")
+
+
+@pytest.fixture
+def sample_docs(tmp_path):
+    """Create sample documents for testing."""
+    docs = {}
+
+    # Plain text
+    txt = tmp_path / "alice.txt"
+    txt.write_text(
+        "Alice was beginning to get very tired of sitting by her sister on the bank. "
+        "She had peeped into the book her sister was reading, but it had no pictures "
+        "or conversations in it. 'And what is the use of a book,' thought Alice, "
+        "'without pictures or conversations?'"
+    )
+    docs["txt"] = str(txt)
+
+    # Markdown
+    md = tmp_path / "readme.md"
+    md.write_text(
+        "# Project Mnemosyne\n\n"
+        "Mnemosyne is a sovereign holographic archive system.\n\n"
+        "## Features\n\n"
+        "- Full-text search with FTS5\n"
+        "- Semantic search with embeddings\n"
+        "- Reciprocal rank fusion for hybrid results\n"
+        "- SQLite-backed, no external dependencies\n"
+    )
+    docs["md"] = str(md)
+
+    # JSON
+    js = tmp_path / "data.json"
+    js.write_text(json.dumps({
+        "title": "The Sovereignty Principle",
+        "body": "Every person has the right to run their own intelligence on their own hardware, "
+                "answerable to no one. This is the foundation of digital sovereignty.",
+    }))
+    docs["json"] = str(js)
+
+    # JSON array
+    js_arr = tmp_path / "records.json"
+    js_arr.write_text(json.dumps([
+        {"title": "Record A", "text": "First record about Bitcoin and the blockchain."},
+        {"title": "Record B", "text": "Second record about AI and language models."},
+    ]))
+    docs["json_array"] = str(js_arr)
+
+    return docs
+
+
+class TestChunking:
+    def test_short_text_no_split(self):
+        text = "Short text."
+        chunks = chunk_text(text, chunk_size=100)
+        assert len(chunks) == 1
+        assert chunks[0] == text
+
+    def test_long_text_splits(self):
+        text = "word " * 200  # 1000 chars
+        chunks = chunk_text(text, chunk_size=200, overlap=20)
+        assert len(chunks) > 1
+
+    def test_overlap_exists(self):
+        text = "aaa " * 100 + "bbb " * 100
+        chunks = chunk_text(text, chunk_size=200, overlap=50)
+        # Some chunks should contain both aaa and bbb due to overlap
+        cross_chunks = [c for c in chunks if "aaa" in c and "bbb" in c]
+        assert len(cross_chunks) > 0
+
+
+class TestIngestion:
+    def test_ingest_text_returns_id(self, db_path):
+        doc_id = ingest_text("Hello world", source="test", db_path=db_path)
+        assert doc_id is not None
+        assert doc_id > 0
+
+    def test_ingest_text_dedup(self, db_path):
+        doc_id1 = ingest_text("Hello world", source="test", db_path=db_path)
+        doc_id2 = ingest_text("Hello world", source="test", db_path=db_path)
+        assert doc_id1 is not None
+        assert doc_id2 is None  # duplicate
+
+    def test_ingest_file_txt(self, db_path, sample_docs):
+        doc_id = ingest_file(sample_docs["txt"], db_path=db_path)
+        assert doc_id is not None
+
+    def test_ingest_file_json(self, db_path, sample_docs):
+        doc_id = ingest_file(sample_docs["json"], db_path=db_path)
+        assert doc_id is not None
+
+    def test_ingest_file_json_array(self, db_path, sample_docs):
+        doc_id = ingest_file(sample_docs["json_array"], db_path=db_path)
+        assert doc_id is not None
+        # Should have ingested 2 records
+        stats = get_stats(db_path)
+        assert stats["documents"] == 2
+
+    def test_ingest_directory(self, db_path, sample_docs, tmp_path):
+        result = ingest_directory(str(tmp_path), db_path=db_path)
+        assert result["ingested"] >= 4
+        assert len(result["errors"]) == 0
+
+    def test_stats(self, db_path, sample_docs):
+        ingest_file(sample_docs["txt"], db_path=db_path)
+        ingest_file(sample_docs["md"], db_path=db_path)
+        stats = get_stats(db_path)
+        assert stats["documents"] == 2
+        assert stats["chunks"] >= 2
+
+
+class TestSearch:
+    def test_keyword_search(self, db_path, sample_docs):
+        ingest_file(sample_docs["md"], db_path=db_path)
+        results = keyword_search("Mnemosyne archive", db_path=db_path)
+        assert len(results) > 0
+        assert "mnemosyne" in results[0]["content"].lower() or "archive" in results[0]["content"].lower()
+
+    def test_query_returns_results(self, db_path, sample_docs):
+        ingest_file(sample_docs["txt"], db_path=db_path)
+        results = query("Alice tired bank", db_path=db_path)
+        assert len(results) > 0
+
+    def test_query_empty_db(self, db_path):
+        results = query("anything", db_path=db_path)
+        assert results == []
+
+    def test_query_no_match(self, db_path, sample_docs):
+        ingest_file(sample_docs["txt"], db_path=db_path)
+        results = query("xyzzyplugh quantum entanglement", db_path=db_path)
+        assert results == []
+
+    def test_list_documents(self, db_path, sample_docs):
+        ingest_file(sample_docs["txt"], db_path=db_path)
+        ingest_file(sample_docs["md"], db_path=db_path)
+        docs = list_documents(db_path=db_path)
+        assert len(docs) == 2
+        assert all("chunks" in d for d in docs)
+
+    def test_get_document(self, db_path, sample_docs):
+        doc_id = ingest_file(sample_docs["txt"], db_path=db_path)
+        doc = get_document(doc_id, db_path=db_path)
+        assert doc is not None
+        assert "Alice" in doc["content"]
+        assert doc["title"] == "alice"
+
+    def test_get_document_not_found(self, db_path):
+        doc = get_document(9999, db_path=db_path)
+        assert doc is None
+
+
+class TestRoundTrip:
+    """Full round-trip: ingest → query → verify recall."""
+
+    def test_round_trip(self, db_path, sample_docs, tmp_path):
+        # Ingest all sample docs
+        result = ingest_directory(str(tmp_path), db_path=db_path)
+        assert result["ingested"] >= 4
+
+        # Verify stats
+        stats = get_stats(db_path)
+        assert stats["documents"] >= 4
+        assert stats["chunks"] > 0
+
+        # Query for Alice
+        results = query("Alice pictures conversations", db_path=db_path)
+        assert len(results) > 0
+        assert any("alice" in r.get("title", "").lower() or "Alice" in r["content"] for r in results)
+
+        # Query for Mnemosyne
+        results = query("Mnemosyne sovereign archive", db_path=db_path)
+        assert len(results) > 0
+
+        # Query for sovereignty
+        results = query("sovereignty intelligence hardware", db_path=db_path)
+        assert len(results) > 0
+
+        # List all documents
+        docs = list_documents(db_path=db_path)
+        assert len(docs) >= 4