test tile retrieval

test/read.test.js

@@ -1,3 +1,4 @@
+var fs = require('fs');
 var assert = require('assert');
 var MBTiles = require('..').MBTiles;
 
@@ -31,3 +32,59 @@ exports['get metadata'] = function(beforeExit) {
         });
     });
 };
+
+function write(mbtiles, x, y, z) {
+    mbtiles.tile(x, y, z, function(err, tile) {
+        if (err) console.warn(err);
+        fs.writeFileSync(__dirname + '/fixtures/images/plain_1_' + x + '_' + y + '_' + z + '.png', tile, 'binary');
+    });
+}
+
+// mbtiles.db.each('SELECT zoom_level, tile_column, tile_row FROM map', function(err, row) {
+//     if (Math.random() > 0.8) {
+//         write(mbtiles, row.tile_column, row.tile_row, row.zoom_level);
+//     }
+// });
+
+function yieldsError(status, error, msg) {
+    return function(err) {
+        assert.equal(err, msg);
+        status[error]++;
+    };
+}
+
+exports['get tiles'] = function(beforeExit) {
+    var status = {
+        success: 0,
+        error: 0
+    };
+
+    var mbtiles = new MBTiles(fixtures.plain_1);
+    fs.readdirSync(__dirname + '/fixtures/images/').forEach(function(file) {
+        var coords = file.match(/^plain_1_(\d+)_(\d+)_(\d+).png$/);
+        if (coords) {
+            mbtiles.tile(coords[1] | 0, coords[2] | 0, coords[3] | 0, function(err, tile) {
+                if (err) throw err;
+                assert.deepEqual(tile, fs.readFileSync(__dirname + '/fixtures/images/' + file));
+                status.success++;
+            });
+        }
+    });
+
+    mbtiles.tile(1, 0, 0, yieldsError(status, 'error', 'Tile does not exist'));
+    mbtiles.tile(0, 0, -1, yieldsError(status, 'error', 'Tile does not exist'));
+    mbtiles.tile(0, -1, 0, yieldsError(status, 'error', 'Tile does not exist'));
+    mbtiles.tile(1, 8, 3, yieldsError(status, 'error', 'Tile does not exist'));
+    mbtiles.tile(-3, 0, 2, yieldsError(status, 'error', 'Tile does not exist'));
+    mbtiles.tile(2, 3, 18, yieldsError(status, 'error', 'Tile does not exist'));
+    mbtiles.tile(0, 0, 4, yieldsError(status, 'error', 'Tile does not exist'));
+
+    beforeExit(function() {
+        assert.equal(status.success, 52);
+        assert.equal(status.error, 7);
+    });
+};
+
+exports['get grids'] = function(beforeExit) {
+
+};