docs: ArcGIS Pro CLI test suite plan

docs/testing/TEST_SUITE_PLAN.md

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+# ArcGIS Pro CLI test suite plan
+
+Goal: high-confidence regression coverage for snapshot/inspect/query/dump across common ArcGIS Pro project shapes.
+
+## 1. Test assets (project archetypes)
+Each archetype is a small .aprx plus required data in a fixtures folder. Prefer reproducible creation steps.
+
+### A. Empty + minimal
+- Empty project (no maps)
+- One map, one layer, default symbology
+
+### B. Layer variety
+- Feature layers: point/line/polygon, multipart, Z/M
+- Raster layers (local)
+- Tables (standalone)
+- Group layers, nested groups
+- Definition queries
+- Joins/relates
+
+### C. Data source variety
+- File geodatabase
+- Shapefile
+- GeoPackage
+- Enterprise (if available) or mocked placeholder
+
+### D. Coordinate systems
+- Mixed SR layers in one map
+- Map SR differs from layer SR
+
+### E. Layouts
+- One layout with map frame
+- Multiple layouts and map frames
+
+### F. Weird but real
+- Broken layer (missing source)
+- Layers with long names + unicode
+- Deep layer tree (performance)
+
+## 2. CLI behavior to verify
+### Snapshot
+- Produces expected files (meta/project/maps/layers/etc)
+- Deterministic fields where promised
+- Handles broken layers without crashing
+
+### Inspect
+- Human-readable output, includes 0 counts correctly
+- Caps output (e.g. first N layers) but reports totals
+
+### Query / Dump
+- Errors are actionable (exit codes, messages)
+- JSON schema stable across versions
+
+## 3. Execution strategy
+- Unit tests: pure python helpers (parsers/formatters)
+- Integration tests: run CLI commands against fixture exports
+- Golden files: store expected JSON outputs per fixture
+
+## 4. CI (pragmatic)
+- Default CI runs unit tests only (no ArcGIS Pro dependency)
+- Optional/manual job: integration tests on a Windows runner with ArcGIS Pro installed