Script to make sure that points are nested correctly between zooms

tests/ensure-zoom-level-nesting.py

@@ -0,0 +1,39 @@
+import sys
+import json
+
+data = json.load(sys.stdin)
+
+layers_per_zoom = {}
+reported = set()
+maxzoom = 0
+
+for tile in data['features']:
+    zoom = tile['properties']['zoom']
+    if zoom > maxzoom:
+        maxzoom = zoom
+
+    for layer in tile['features']:
+        layername = layer['properties']['layer']
+
+        for feature in layer['features']:
+            if zoom not in layers_per_zoom:
+                layers_per_zoom[zoom] = {}
+            if layername not in layers_per_zoom[zoom]:
+                layers_per_zoom[zoom][layername] = set()
+
+            if 'tippecanoe:retain_points_multiplier_sequence' in feature['properties']:
+                del(feature['properties']['tippecanoe:retain_points_multiplier_sequence'])
+            if 'tippecanoe:retain_points_multiplier_first' in feature['properties']:
+                del(feature['properties']['tippecanoe:retain_points_multiplier_first'])
+
+            properties = json.dumps(feature['properties'])
+            layers_per_zoom[zoom][layername].add(properties)
+
+for zoom in range(maxzoom + 1):
+    for layer in layers_per_zoom[zoom]:
+        for feature in layers_per_zoom[zoom][layer]:
+            if feature not in reported:
+                for z in range(zoom + 1, maxzoom + 1):
+                    if feature not in layers_per_zoom[z][layer]:
+                        print("in", zoom, "but not in", z, ":", feature)
+                        reported.add(feature)