use same test as union

Author: vincentsarago

tests/expected/heatmap.txt

@@ -1,7 +1,4 @@
-{"geometry": {"type": "Polygon", "coordinates": [[[-5.625000000000113, 52.482780222078254], [-5.625000000000113, 48.9224992637583], [-1.2131008896728105e-13, 48.9224992637583], [-1.2131008896728105e-13, 52.482780222078254], [-5.625000000000113, 52.482780222078254]]]}, "properties": {"n": 4.0}, "type": "Feature"}
-{"geometry": {"type": "Polygon", "coordinates": [[[-1.2131008896728105e-13, 52.482780222078254], [-1.2131008896728105e-13, 45.08903556483109], [5.62499999999987, 45.08903556483109], [5.62499999999987, 52.482780222078254], [-1.2131008896728105e-13, 52.482780222078254]]]}, "properties": {"n": 1.0}, "type": "Feature"}
-{"geometry": {"type": "Polygon", "coordinates": [[[5.62499999999987, 52.482780222078254], [5.62499999999987, 45.08903556483109], [11.24999999999986, 45.08903556483109], [11.24999999999986, 52.482780222078254], [5.62499999999987, 52.482780222078254]]]}, "properties": {"n": 4.0}, "type": "Feature"}
-{"geometry": {"type": "Polygon", "coordinates": [[[-5.625000000000113, 48.9224992637583], [-5.625000000000113, 45.08903556483109], [-1.2131008896728105e-13, 45.08903556483109], [-1.2131008896728105e-13, 48.9224992637583], [-5.625000000000113, 48.9224992637583]]]}, "properties": {"n": 3.0}, "type": "Feature"}
-{"geometry": {"type": "Polygon", "coordinates": [[[-5.625000000000113, 45.08903556483109], [-5.625000000000113, 40.97989806962022], [-1.2131008896728105e-13, 40.97989806962022], [-1.2131008896728105e-13, 45.08903556483109], [-5.625000000000113, 45.08903556483109]]]}, "properties": {"n": 7.0}, "type": "Feature"}
-{"geometry": {"type": "Polygon", "coordinates": [[[-1.2131008896728105e-13, 45.08903556483109], [-1.2131008896728105e-13, 40.97989806962022], [5.62499999999987, 40.97989806962022], [5.62499999999987, 45.08903556483109], [-1.2131008896728105e-13, 45.08903556483109]]]}, "properties": {"n": 4.0}, "type": "Feature"}
-{"geometry": {"type": "Polygon", "coordinates": [[[5.62499999999987, 45.08903556483109], [5.62499999999987, 40.97989806962022], [11.24999999999986, 40.97989806962022], [11.24999999999986, 45.08903556483109], [5.62499999999987, 45.08903556483109]]]}, "properties": {"n": 1.0}, "type": "Feature"}
+{"geometry": {"type": "Polygon", "coordinates": [[[4.21874999999975, 44.05601169578539], [4.21874999999975, 44.02442151965947], [4.2626953124997495, 44.02442151965947], [4.2626953124997495, 44.05601169578539], [4.21874999999975, 44.05601169578539]]]}, "properties": {"n": 1.0}, "type": "Feature"}
+{"geometry": {"type": "Polygon", "coordinates": [[[4.21874999999975, 43.86621800655652], [4.21874999999975, 43.834526782236956], [4.2626953124997495, 43.834526782236956], [4.2626953124997495, 43.86621800655652], [4.21874999999975, 43.86621800655652]]]}, "properties": {"n": 1.0}, "type": "Feature"}
+{"geometry": {"type": "Polygon", "coordinates": [[[4.21874999999975, 40.11168866559609], [4.21874999999975, 40.07807142745022], [4.2626953124997495, 40.07807142745022], [4.2626953124997495, 40.11168866559609], [4.21874999999975, 40.11168866559609]]]}, "properties": {"n": 1.0}, "type": "Feature"}
+{"geometry": {"type": "Polygon", "coordinates": [[[4.042968749999755, 39.90973623453731], [4.042968749999755, 39.87601941962127], [4.086914062499754, 39.87601941962127], [4.086914062499754, 39.90973623453731], [4.042968749999755, 39.90973623453731]]]}, "properties": {"n": 1.0}, "type": "Feature"}

tests/fixtures/heatmap.txt

@@ -1,29 +1,4 @@
-[31, 21, 6]
-[32, 21, 6]
-[33, 21, 6]
-[31, 22, 6]
-[32, 22, 6]
-[33, 22, 6]
-[31, 23, 6]
-[32, 23, 6]
-[33, 23, 6]
-[33, 21, 6]
-[31, 22, 6]
-[31, 23, 6]
-[33, 22, 6]
-[33, 22, 6]
-[33, 22, 6]
-[31, 23, 6]
-[31, 23, 6]
-[33, 21, 6]
-[33, 21, 6]
-[32, 23, 6]
-[31, 22, 6]
-[31, 21, 6]
-[31, 23, 6]
-[31, 23, 6]
-[31, 23, 6]
-[31, 21, 6]
-[31, 21, 6]
-[32, 23, 6]
-[32, 23, 6]
+[4188, 3104, 13]
+[4192, 2977, 13]
+[4192, 3098, 13]
+[4192, 2983, 13]