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"""Tests for navegador.graph.migrations — schema versioning and migration.""" |
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from unittest.mock import MagicMock, call |
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import pytest |
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from navegador.graph.migrations import ( |
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CURRENT_SCHEMA_VERSION, |
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_migrations, |
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get_schema_version, |
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migrate, |
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needs_migration, |
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set_schema_version, |
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) |
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def _mock_store(version=None): |
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store = MagicMock() |
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if version is None: |
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store.query.return_value = MagicMock(result_set=[]) |
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else: |
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store.query.return_value = MagicMock(result_set=[[version]]) |
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return store |
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# ── get_schema_version ─────────────────────────────────────────────────────── |
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class TestGetSchemaVersion: |
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def test_returns_zero_for_empty_graph(self): |
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store = _mock_store(version=None) |
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assert get_schema_version(store) == 0 |
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def test_returns_zero_for_null_version(self): |
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store = MagicMock() |
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store.query.return_value = MagicMock(result_set=[[None]]) |
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assert get_schema_version(store) == 0 |
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def test_returns_stored_version(self): |
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store = _mock_store(version=2) |
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assert get_schema_version(store) == 2 |
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# ── set_schema_version ────────────────────────────────────────────────────── |
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class TestSetSchemaVersion: |
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def test_calls_query_with_merge(self): |
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store = MagicMock() |
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set_schema_version(store, 3) |
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store.query.assert_called_once() |
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cypher = store.query.call_args[0][0] |
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assert "MERGE" in cypher |
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assert store.query.call_args[0][1]["version"] == 3 |
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# ── needs_migration ────────────────────────────────────────────────────────── |
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class TestNeedsMigration: |
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def test_true_when_behind(self): |
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store = _mock_store(version=0) |
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assert needs_migration(store) is True |
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def test_false_when_current(self): |
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store = _mock_store(version=CURRENT_SCHEMA_VERSION) |
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assert needs_migration(store) is False |
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# ── migrate ────────────────────────────────────────────────────────────────── |
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class TestMigrate: |
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def test_applies_all_migrations_from_zero(self): |
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call_log = [] |
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def track_query(cypher, params=None): |
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call_log.append(cypher) |
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result = MagicMock() |
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# get_schema_version query returns no rows initially |
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if "Meta" in cypher and "RETURN" in cypher: |
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result.result_set = [] |
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else: |
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result.result_set = [] |
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return result |
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store = MagicMock() |
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store.query.side_effect = track_query |
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applied = migrate(store) |
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assert applied == list(range(1, CURRENT_SCHEMA_VERSION + 1)) |
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def test_no_op_when_already_current(self): |
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store = _mock_store(version=CURRENT_SCHEMA_VERSION) |
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applied = migrate(store) |
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assert applied == [] |
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def test_raises_on_missing_migration(self): |
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# Temporarily remove a migration to trigger the RuntimeError |
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saved = _migrations.pop(0) |
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try: |
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store = _mock_store(version=None) |
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with pytest.raises(RuntimeError, match="No migration registered"): |
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migrate(store) |
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finally: |
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_migrations[0] = saved |
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# ── migrations registry ───────────────────────────────────────────────────── |
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class TestMigrationsRegistry: |
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def test_has_migration_for_each_version(self): |
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for v in range(CURRENT_SCHEMA_VERSION): |
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assert v in _migrations, f"Missing migration for version {v} -> {v + 1}" |
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def test_current_version_is_positive(self): |
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assert CURRENT_SCHEMA_VERSION > 0 |
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def test_migration_0_to_1_runs(self): |
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store = MagicMock() |
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store.query.return_value = MagicMock(result_set=[]) |
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_migrations[0](store) |
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def test_migration_1_to_2_sets_content_hash(self): |
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store = MagicMock() |
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store.query.return_value = MagicMock(result_set=[]) |
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_migrations[1](store) |
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store.query.assert_called_once() |
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cypher = store.query.call_args[0][0] |
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assert "content_hash" in cypher |
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