test: add geometry fixture corpus and baselines

[kirangadhave]

📝 Summary

Add shared geometry fixtures and current-behavior baselines for the geospatial foundation work in MO-6362. Freeze false-positive and ordinary-table payloads, and keep geometry characterization local until it runs reliably in CI.

🗺️ Stack

This PR is part of a four-PR stack that adds a semantic geometry type for geospatial columns (MO-6362). Merge bottom-up with squash. Each PR targets the branch below it, so each diff shows only its own commits. After each merge, I rebase the remaining PRs.

1. test: add geometry fixture corpus and baselines #10516: geometry fixture corpus and ordinary-table baselines ⬅️ this PR
2. feat: add GeoPandas geometry table support #10536: geometry contract and GeoPandas detection
3. feat: detect GeoArrow columns in PyArrow tables #10558: PyArrow adapter (GeoArrow field metadata)
4. feat: detect duckdb spatial columns as geometry #10592: DuckDB adapter and SQL metadata (completes the release gate)

ibis detection is deferred: no user demand, and nothing downstream depends on it.

Closes MO-7322

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Project	Deployment	Actions	Updated (UTC)
marimo-docs	Ready	Preview	Aug 20, 2026 6:06pm

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[cubic-dev-ai]

All reported issues were addressed across 13 files

Architecture diagram

sequenceDiagram
    participant Test as Test Suite
    participant Fixtures as geometry_fixtures.py
    participant GDF as GeoPandas Data
    participant Arrow as PyArrow Tables
    participant DuckDB as DuckDB Spatial
    participant Ibis as Ibis Table
    participant Mgr as Table Manager
    participant Snapshot as Snapshot System

    Note over Test,Snapshot: Geometry Characterization Flow (CI-skipped except false positives/ordinary)

    Test->>Fixtures: Request GDF fixture
    alt GeoPandas fixtures
        Fixtures->>GDF: Build GeoDataFrame
        GDF-->>Fixtures: GeoDataFrame
        Fixtures-->>Test: Return frame
        Test->>Mgr: get_table_manager(frame)
        Mgr->>Mgr: Detect geometry col
        Mgr-->>Test: field_types + serialization
    else GeoArrow fixtures
        Fixtures->>Arrow: Build Table with metadata
        Arrow-->>Fixtures: PyArrow Table
        Fixtures-->>Test: Return table
        Test->>Mgr: get_table_manager(table)
        Mgr->>Arrow: Read extension metadata
        Arrow-->>Mgr: WKB/WKT/other
        Mgr-->>Test: field_types + serialization
    else DuckDB fixtures
        Test->>Fixtures: duckdb_spatial_connection()
        alt Spatial extension loads
            Fixtures->>DuckDB: INSTALL+LOAD spatial
            DuckDB-->>Fixtures: Connection
            Fixtures->>DuckDB: Create relation
            DuckDB-->>Fixtures: Relation
            Fixtures-->>Test: Return relation
            Test->>Mgr: get_table_manager(relation)
            Mgr->>DuckDB: Query schema
            DuckDB-->>Mgr: geom field type
            Mgr-->>Test: unknown type
        else Extension fails
            Fixtures-->>Test: pytest.skip
        end
    else Ibis fixture
        Test->>Fixtures: ibis_geometry_table()
        Fixtures->>Ibis: Connect with spatial
        alt Extension available
            Ibis-->>Fixtures: Table
            Fixtures-->>Test: Return table
            Test->>Mgr: get_table_manager(table)
            Mgr->>Ibis: Read schema
            Ibis-->>Mgr: geospatial:geometry
            Mgr-->>Test: unknown type
        else Fails
            Fixtures-->>Test: pytest.skip
        end
    end

    Note over Test,Snapshot: Baseline Snapshot Flow (runs in CI)

    Test->>Fixtures: false_positive_data()
    Fixtures-->>Test: Dict with raw_binary, wkt_looking, h3_int
    Test->>Mgr: get_table_manager(pandas/polars/pyarrow)
    Mgr-->>Test: field_types + JSON
    Test->>Snapshot: Compare snapshots
    Snapshot-->>Test: Pass/Fail

    Test->>Fixtures: ordinary_data()
    Fixtures-->>Test: Dict with typed columns
    Test->>Mgr: get_table_manager(pyarrow/duckdb)
    Mgr-->>Test: field_types + JSON
    Test->>Snapshot: Compare snapshots
    Snapshot-->>Test: Pass/Fail

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[Copilot]

Pull request overview

Adds a shared geometry fixture corpus and introduces snapshot-based baseline tests to freeze current table-manager serialization/field-type behavior across multiple dataframe backends, in support of upcoming geospatial foundation work.

Changes:

• Add geometry_fixtures.py with factory helpers spanning GeoPandas, GeoArrow (WKB/WKT), DuckDB spatial, ibis, plus “false positive” and “ordinary” datasets.
• Add characterization and baseline snapshot tests for field-type inference and JSON serialization.
• Add snapshot files capturing current “ordinary” and “false positives” outputs for several backends.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/_plugins/ui/_impl/tables/test_geometry_fixtures.py	Adds characterization tests plus snapshot baselines for “false positives” and “ordinary” payloads.
tests/_plugins/ui/_impl/tables/geometry_fixtures.py	Introduces shared fixture factories covering multiple geospatial/tabular backends and baseline datasets.
tests/_plugins/ui/_impl/tables/snapshots/ordinary.pyarrow.json	Captures “ordinary” PyArrow JSON payload baseline.
tests/_plugins/ui/_impl/tables/snapshots/ordinary.pyarrow.field_types.json	Captures “ordinary” PyArrow field-type baseline.
tests/_plugins/ui/_impl/tables/snapshots/ordinary.duckdb.json	Captures “ordinary” DuckDB relation JSON payload baseline.
tests/_plugins/ui/_impl/tables/snapshots/ordinary.duckdb.field_types.json	Captures “ordinary” DuckDB field-type baseline.
tests/_plugins/ui/_impl/tables/snapshots/false_positives.shapely_objects.field_types.json	Captures baseline field types for shapely objects in a non-geometry column.
tests/_plugins/ui/_impl/tables/snapshots/false_positives.pyarrow.json	Captures PyArrow “false positives” JSON payload baseline.
tests/_plugins/ui/_impl/tables/snapshots/false_positives.pyarrow.field_types.json	Captures PyArrow “false positives” field-type baseline.
tests/_plugins/ui/_impl/tables/snapshots/false_positives.polars.json	Captures Polars “false positives” JSON payload baseline.
tests/_plugins/ui/_impl/tables/snapshots/false_positives.polars.field_types.json	Captures Polars “false positives” field-type baseline.
tests/_plugins/ui/_impl/tables/snapshots/false_positives.pandas.json	Captures Pandas “false positives” JSON payload baseline.
tests/_plugins/ui/_impl/tables/snapshots/false_positives.pandas.field_types.json	Captures Pandas “false positives” field-type baseline.

Suppressed comments (1)

tests/_plugins/ui/_impl/tables/geometry_fixtures.py:226

• Inline code in docstrings should use single backticks (Markdown), not double backticks.

    ``INSTALL spatial`` downloads the extension, so network-blocked

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