Add MockFileSource and MockView for testing the ResourceLoader

- MockFileSource
  Will load pre-defined resources from the filesystem. It supports
  passing a string, that when it matches an URL, will simulate a failure.

- MockView
  It is just a no-op to not get in the way when testing
  resource loading.

Few more additions:

- style.json
  Specially crafted style that will look always for the same tile,
  glyph range, etc at the "test/fixtures/resources/" path. No matter
  where you look (or at what zoom), you always get the same stuff.

- vector.pbf
  This taken from a part of Taipei that will request several glyph
  ranges.

6 files changed, 33 insertions, 0 deletions

diff --git a/test/fixtures/resources/glyphs.pbf b/test/fixtures/resources/glyphs.pbf
new file mode 100644
index 0000000000..0d160f7898
--- /dev/null
+++ b/test/fixtures/resources/glyphs.pbf
diff --git a/test/fixtures/resources/source.json b/test/fixtures/resources/source.json
new file mode 100644
index 0000000000..db516f9f95
--- /dev/null
+++ b/test/fixtures/resources/source.json
@@ -0,0 +1 @@
+{"attribution":"<a href=\"https://www.mapbox.com/about/maps/\" target=\"_blank\">&copy; Mapbox</a> <a href=\"http://www.openstreetmap.org/about/\" target=\"_blank\">&copy; OpenStreetMap</a> <a class=\"mapbox-improve-map\" href=\"https://www.mapbox.com/map-feedback/\" target=\"_blank\">Improve this map</a>","bounds":[-180,-85.0511,180,85.0511],"center":[0,0,0],"format":"pbf","maxzoom":15,"minzoom":0,"name":"Mapbox Streets V6 + Vector Terrain V2","scheme":"xyz","tilejson":"2.0.0","tiles":["test/fixtures/resources/vector.pbf"],"vector_layers":[{"description":"Generalized landcover classification","fields":{"class":"One of: wood, scrub, grass, crop, snow"},"id":"landcover","maxzoom":22,"minzoom":0},{"description":"","fields":{"class":"One of: shadow, highlight","level":"Brightness %. One of: 94, 90, 89, 78, 67, 56"},"id":"hillshade","maxzoom":22,"minzoom":0},{"description":"Elevation contour polygons","fields":{"ele":"Integer. The elevation of the contour in meters.","index":"Indicator for every 2nd, 5th, or 10th contour. Coastlines are given -1. One of: 2, 5, 10, -1, null"},"id":"contour","maxzoom":22,"minzoom":0},{"description":"","fields":{"class":"One of: cemetery, hospital, industrial, park, parking, pitch, sand, school, wood","osm_id":"Unique OSM ID number","type":"OSM tag, more specific than class"},"id":"landuse"},{"description":"","fields":{"class":"One of: river, canal, stream, stream_intermittent, ditch, drain","osm_id":"Unique OSM ID number","type":"One of: river, canal, stream, ditch, drain"},"id":"waterway"},{"description":"","fields":{"osm_id":"Unique OSM ID number"},"id":"water"},{"description":"","fields":{"osm_id":"Unique OSM ID number","type":"One of: runway, taxiway, apron"},"id":"aeroway"},{"description":"","fields":{"class":"One of: fence, hedge, cliff, gate","osm_id":"Unique OSM ID number"},"id":"barrier_line"},{"description":"","fields":{"osm_id":"Unique OSM ID number"},"id":"building"},{"description":"","fields":{"class":"One of: wetland, wetland_noveg","osm_id":"Unique OSM ID number"},"id":"landuse_overlay"},{"description":"","fields":{"class":"One of: motorway, motorway_link, main, street, street_limited, service, driveway, path, major_rail, minor_rail, aerialway","layer":"Number used for ordering overlapping tunnels","oneway":"Number. Oneway roads are 1, all others are 0.","osm_id":"Unique OSM ID number","type":"The value of the tunnel's highway tag"},"id":"tunnel"},{"description":"","fields":{"class":"One of: motorway, motorway_link, main, street, street_limited, service, driveway, path, major_rail, minor_rail, aerialway","oneway":"Number. Oneway roads are 1, all others are 0.","osm_id":"Unique OSM ID number","type":"The value of the road's highway tag"},"id":"road"},{"description":"","fields":{"class":"One of: motorway, motorway_link, main, street, street_limited, service, driveway, path, major_rail, minor_rail, aerialway","layer":"Number used for ordering overlapping bridges","oneway":"Number. Oneway bridges are 1, all others are 0.","osm_id":"Unique OSM ID number","type":"The value of the bridge's highway tag"},"id":"bridge"},{"description":"","fields":{"admin_level":"The OSM administrative level of the boundary","disputed":"Number. Disputed boundaries are 1, all others are 0.","maritime":"Number. Maritime boundaries are 1, all others are 0."},"id":"admin"},{"description":"","fields":{"code":"ISO 3166-1 Alpha-2 code","name":"Local name of the country","name_de":"German name of the country","name_en":"English name of the country","name_es":"Spanish name of the country","name_fr":"French name of the country","name_ru":"Russian name of the country","name_zh":"Chinese name of the country","osm_id":"Unique OSM ID number","parent":"ISO 3166-1 Alpha-2 code of the administering/parent state, if any","scalerank":"Number, 1-6. Useful for styling text sizes.","type":"One of: country, territory, disputed territory, sar"},"id":"country_label"},{"description":"","fields":{"labelrank":"Number, 1-6. Useful for styling text sizes.","name":"Local or international name of the water body","name_de":"German name of the water body","name_en":"English name of the water body","name_es":"Spanish name of the water body","name_fr":"French name of the water body","name_ru":"Russian name of the water body","name_zh":"Chinese name of the water body","placement":"One of: point, line"},"id":"marine_label"},{"description":"","fields":{"abbr":"Abbreviated state name","area":"The area of the state in kilometers²","name":"Local name of the state","name_de":"German name of the state","name_en":"English name of the state","name_es":"Spanish name of the state","name_fr":"French name of the state","name_ru":"Russian name of the state","name_zh":"Chinese name of the state","osm_id":"Unique OSM ID number"},"id":"state_label"},{"description":"","fields":{"capital":"Admin level the city is a capital of, if any. One of: 2, 3, 4, null","ldir":"A hint for label placement at low zoom levels. One of: N, E, S, W, NE, SE, SW, NW, null","localrank":"Number. Priority relative to nearby places. Useful for limiting label density.","name":"Local name of the place","name_de":"German name of the place","name_en":"English name of the place","name_es":"Spanish name of the place","name_fr":"French name of the place","name_ru":"Russian name of the place","name_zh":"Chinese name of the place","osm_id":"Unique OSM ID number","scalerank":"Number, 0-9 or null. Useful for styling text & marker sizes.","type":"One of: city, town, village, hamlet, suburb, neighbourhood"},"id":"place_label"},{"description":"","fields":{"area":"The area of the water polygon in Mercator meters²","name":"Local name of the water body","name_de":"German name of the water body","name_en":"English name of the water body","name_es":"Spanish name of the water body","name_fr":"French name of the water body","name_ru":"Russian name of the water body","name_zh":"Chinese name of the water body","osm_id":"Unique OSM ID number"},"id":"water_label"},{"description":"","fields":{"address":"Street address of the POI","localrank":"Number. Priority relative to nearby POIs. Useful for limiting label density.","maki":"The name of the Maki icon that should be used for the POI","name":"Local name of the POI","name_de":"German name of the POI","name_en":"English name of the POI","name_es":"Spanish name of the POI","name_fr":"French name of the POI","name_ru":"Russian name of the POI","name_zh":"Chinese name of the POI","network":"For rail stations, the network(s) that the station serves. Useful for icon styling.","osm_id":"Unique OSM ID number","ref":"Short reference code, if any","scalerank":"Number. 1-4. Useful for styling icon sizes and minimum zoom levels.","type":"The original OSM tag value","website":"URL of the POI"},"id":"poi_label"},{"description":"","fields":{"class":"One of: motorway, motorway_link, main, street, street_limited, service, driveway, path","len":"Number. Length of the road segment in Mercator meters.","localrank":"Number. Used for shield points only. Priority relative to nearby shields. Useful for limiting shield density.","name":"Local name of the road","name_de":"German name of the road","name_en":"English name of the road","name_es":"Spanish name of the road","name_fr":"French name of the road","name_ru":"Russian name of the road","name_zh":"Chinese name of the road","osm_id":"Unique OSM ID number","ref":"Route number of the road","reflen":"Number. How many characters long the ref tag is. Useful for shield styling.","shield":"The shield style to use. One of: default, mx-federal, mx-state, us-highway, us-highway-alternate, us-highway-business, us-highway-duplex, us-interstate, us-interstate-business, us-interstate-duplex, us-interstate-truck, us-state"},"id":"road_label"},{"description":"","fields":{"class":"One of: river, canal, stream, stream_intermittent","name":"Local name of the waterway","name_de":"German name of the waterway","name_en":"English name of the waterway","name_es":"Spanish name of the waterway","name_fr":"French name of the waterway","name_ru":"Russian name of the waterway","name_zh":"Chinese name of the waterway","osm_id":"Unique OSM ID number","type":"One of: river, canal, stream"},"id":"waterway_label"},{"description":"","fields":{"house_num":"House number","osm_id":"Unique OSM ID number"},"id":"housenum_label"}]}
diff --git a/test/fixtures/resources/sprite.json b/test/fixtures/resources/sprite.json
new file mode 100644
index 0000000000..dcc2b4808c
--- /dev/null
+++ b/test/fixtures/resources/sprite.json
@@ -0,0 +1 @@
+{"background":{"x":0,"y":20,"width":50,"height":50,"pixelRatio":1,"sdf":false},"grass_pattern":{"x":100,"y":80,"width":50,"height":50,"pixelRatio":1,"sdf":false},"interstate_1":{"x":0,"y":100,"width":41,"height":40,"pixelRatio":1,"sdf":false},"interstate_2":{"x":0,"y":100,"width":41,"height":40,"pixelRatio":1,"sdf":false},"interstate_3":{"x":41,"y":100,"width":48,"height":39,"pixelRatio":1,"sdf":false},"us_state_1":{"x":0,"y":73,"width":29,"height":24,"pixelRatio":1,"sdf":false},"us_state_2":{"x":0,"y":73,"width":29,"height":24,"pixelRatio":1,"sdf":false},"us_state_3":{"x":30,"y":73,"width":32,"height":24,"pixelRatio":1,"sdf":false},"us_highway_1":{"x":0,"y":142,"width":29,"height":29,"pixelRatio":1,"sdf":false},"us_highway_2":{"x":30,"y":142,"width":33,"height":29,"pixelRatio":1,"sdf":false},"us_highway_3":{"x":64,"y":142,"width":36,"height":29,"pixelRatio":1,"sdf":false},"default_1":{"x":0,"y":0,"width":17,"height":16,"pixelRatio":1,"sdf":false},"default_2":{"x":17,"y":0,"width":22,"height":16,"pixelRatio":1,"sdf":false},"default_3":{"x":39,"y":0,"width":27,"height":16,"pixelRatio":1,"sdf":false},"default_4":{"x":66,"y":0,"width":32,"height":16,"pixelRatio":1,"sdf":false},"default_5":{"x":98,"y":0,"width":37,"height":16,"pixelRatio":1,"sdf":false},"default_6":{"x":135,"y":0,"width":42,"height":16,"pixelRatio":1,"sdf":false},"london-overground":{"x":70,"y":25,"width":18,"height":18,"pixelRatio":1,"sdf":false},"london-underground":{"x":88,"y":25,"width":18,"height":18,"pixelRatio":1,"sdf":false},"national-rail":{"x":106,"y":25,"width":18,"height":18,"pixelRatio":1,"sdf":false},"dlr":{"x":106,"y":25,"width":18,"height":18,"pixelRatio":1,"sdf":false},"dlr.london-overground.london-underground.national-rail":{"x":70,"y":25,"width":72,"height":18,"pixelRatio":1,"sdf":false},"dlr.london-underground":{"x":88,"y":25,"width":36,"height":18,"pixelRatio":1,"sdf":false},"dlr.london-underground.national-rail":{"x":88,"y":25,"width":54,"height":18,"pixelRatio":1,"sdf":false},"dlr.national-rail":{"x":106,"y":25,"width":36,"height":18,"pixelRatio":1,"sdf":false},"london-overground.london-underground":{"x":70,"y":25,"width":36,"height":18,"pixelRatio":1,"sdf":false},"london-overground.london-underground.national-rail":{"x":124,"y":25,"width":54,"height":18,"pixelRatio":1,"sdf":false},"london-overground.national-rail":{"x":124,"y":25,"width":36,"height":18,"pixelRatio":1,"sdf":false},"london-underground.national-rail":{"x":124,"y":43,"width":36,"height":18,"pixelRatio":1,"sdf":false},"metro":{"x":71,"y":43,"width":18,"height":18,"pixelRatio":1,"sdf":false},"rer":{"x":87,"y":43,"width":18,"height":18,"pixelRatio":1,"sdf":false},"metro.rer":{"x":71,"y":43,"width":34,"height":18,"pixelRatio":1,"sdf":false},"rer.transilien":{"x":87,"y":43,"width":36,"height":18,"pixelRatio":1,"sdf":false},"u-bahn":{"x":70,"y":62,"width":18,"height":18,"pixelRatio":1,"sdf":false},"s-bahn":{"x":88,"y":62,"width":18,"height":18,"pixelRatio":1,"sdf":false},"s-bahn.u-bahn":{"x":70,"y":62,"width":36,"height":18,"pixelRatio":1,"sdf":false},"washington-metro":{"x":106,"y":62,"width":18,"height":18,"pixelRatio":1,"sdf":false},"wiener-linien":{"x":124,"y":62,"width":18,"height":18,"pixelRatio":1,"sdf":false},"moscow-metro":{"x":142,"y":61,"width":21,"height":18,"pixelRatio":1,"sdf":false},"generic-metro":{"x":160,"y":43,"width":18,"height":18,"pixelRatio":1,"sdf":false},"generic-rail":{"x":178,"y":43,"width":18,"height":18,"pixelRatio":1,"sdf":false},"dot":{"x":166,"y":63,"width":13,"height":13,"pixelRatio":1,"sdf":false},"default_marker":{"x":0,"y":175,"width":33,"height":86,"pixelRatio":1,"sdf":false},"secondary_marker":{"x":33,"y":175,"width":33,"height":86,"pixelRatio":1,"sdf":false},"oneway_motorway":{"x":178,"y":24,"width":21,"height":19,"pixelRatio":1,"sdf":false},"oneway_road":{"x":178,"y":62,"width":21,"height":19,"pixelRatio":1,"sdf":false},"hospital_icon":{"x":157,"y":259,"width":18,"height":18,"pixelRatio":1,"sdf":false},"fire-station_icon":{"x":157,"y":241,"width":18,"height":18,"pixelRatio":1,"sdf":false},"cemetery_icon":{"x":157,"y":79,"width":18,"height":18,"pixelRatio":1,"sdf":false},"zoo_icon":{"x":177,"y":79,"width":18,"height":18,"pixelRatio":1,"sdf":false},"park_icon":{"x":177,"y":97,"width":18,"height":18,"pixelRatio":1,"sdf":false},"golf_icon":{"x":177,"y":115,"width":18,"height":18,"pixelRatio":1,"sdf":false},"school_icon":{"x":177,"y":133,"width":18,"height":18,"pixelRatio":1,"sdf":false},"monument_icon":{"x":177,"y":151,"width":18,"height":18,"pixelRatio":1,"sdf":false},"library_icon":{"x":177,"y":169,"width":18,"height":18,"pixelRatio":1,"sdf":false},"museum_icon":{"x":177,"y":187,"width":18,"height":18,"pixelRatio":1,"sdf":false},"college_icon":{"x":177,"y":205,"width":18,"height":18,"pixelRatio":1,"sdf":false},"religious-christian_icon":{"x":157,"y":115,"width":18,"height":18,"pixelRatio":1,"sdf":false},"religious-jewish_icon":{"x":157,"y":133,"width":18,"height":18,"pixelRatio":1,"sdf":false},"religious-muslim_icon":{"x":157,"y":151,"width":18,"height":18,"pixelRatio":1,"sdf":false},"government_icon":{"x":157,"y":169,"width":18,"height":18,"pixelRatio":1,"sdf":false},"post_icon":{"x":157,"y":205,"width":18,"height":18,"pixelRatio":1,"sdf":false},"embassy_icon":{"x":157,"y":223,"width":18,"height":18,"pixelRatio":1,"sdf":false},"police_icon":{"x":157,"y":169,"width":18,"height":18,"pixelRatio":1,"sdf":false},"marker_icon":{"x":157,"y":169,"width":18,"height":18,"pixelRatio":1,"sdf":false},"prison_icon":{"x":157,"y":169,"width":18,"height":18,"pixelRatio":1,"sdf":false},"airfield_icon":{"x":157,"y":187,"width":18,"height":18,"pixelRatio":1,"sdf":false},"airport_icon":{"x":157,"y":187,"width":18,"height":18,"pixelRatio":1,"sdf":false},"harbor_icon":{"x":139,"y":169,"width":18,"height":18,"pixelRatio":1,"sdf":false},"generic_icon":{"x":139,"y":187,"width":18,"height":18,"pixelRatio":1,"sdf":false},"hospital_striped":{"x":117,"y":135,"width":3,"height":3,"pixelRatio":1,"sdf":false},"school_striped":{"x":114,"y":135,"width":3,"height":3,"pixelRatio":1,"sdf":false},"sand_noise":{"x":75,"y":174,"width":50,"height":50,"pixelRatio":1,"sdf":false}}
\ No newline at end of file
diff --git a/test/fixtures/resources/sprite.png b/test/fixtures/resources/sprite.png
new file mode 100644
index 0000000000..967f2e76a6
--- /dev/null
+++ b/test/fixtures/resources/sprite.png
diff --git a/test/fixtures/resources/style.json b/test/fixtures/resources/style.json
new file mode 100644
index 0000000000..698f3fb1e8
--- /dev/null
+++ b/test/fixtures/resources/style.json
@@ -0,0 +1,31 @@
+{
+  "version": 1,
+  "name": "Test",
+  "sources": {
+    "compositedsource": {
+      "url": "test/fixtures/resources/source.json",
+      "type": "vector"
+    }
+  },
+  "sprite": "test/fixtures/resources/sprite",
+  "glyphs": "test/fixtures/resources/glyphs.pbf",
+  "layers": [{
+    "id": "road",
+    "type": "symbol",
+    "source": "compositedsource",
+    "source-layer": "road_label",
+    "layout": {
+      "text-font": "Open Sans Regular, Arial Unicode MS Regular",
+      "text-field": "{name_en}"
+    }
+  }, {
+    "id": "poi",
+    "type": "symbol",
+    "source": "compositedsource",
+    "source-layer": "poi_label",
+    "layout": {
+      "text-font": "Open Sans Regular, Arial Unicode MS Regular",
+      "icon-image": "{maki}_icon"
+    }
+  }]
+}
diff --git a/test/fixtures/resources/vector.pbf b/test/fixtures/resources/vector.pbf
new file mode 100644
index 0000000000..cea355eeff
--- /dev/null
+++ b/test/fixtures/resources/vector.pbf