diff --git a/test/write_grids.test.js b/test/write_grids.test.js
new file mode 100644
index 0000000..d74f6f5
--- /dev/null
+++ b/test/write_grids.test.js
@@ -0,0 +1,75 @@
+process.env.NODE_ENV = 'test';
+
+var fs = require('fs');
+var assert = require('assert');
+var MBTiles = require('..');
+
+var fixtureDir = __dirname + '/fixtures/output';
+
+// Recreate output directory to remove previous tests.
+try { fs.unlinkSync(fixtureDir + '/write_1.mbtiles'); } catch(err) {}
+try { fs.mkdirSync(fixtureDir, 0755); } catch(err) {}
+
+exports['test mbtiles file creation'] = function(beforeExit) {
+    var completed = { written: 0, read: 0 };
+    new MBTiles(fixtureDir + '/write_1.mbtiles', function(err, mbtiles) {
+        completed.open = true;
+        if (err) throw err;
+
+        mbtiles.startWriting(function(err) {
+            completed.started = true;
+            if (err) throw err;
+
+            fs.readdirSync(__dirname + '/fixtures/grids/').forEach(insertGrid);
+        });
+
+        function insertGrid(file) {
+            var coords = file.match(/^plain_2_(\d+)_(\d+)_(\d+).json$/);
+            if (!coords) return;
+
+            // Flip Y coordinate because file names are TMS, but .putGrid() expects XYZ.
+            coords[2] = Math.pow(2, coords[3]) - 1 - coords[2];
+
+            fs.readFile(__dirname + '/fixtures/grids/' + file, 'utf8', function(err, grid) {
+                if (err) throw err;
+
+                mbtiles.putGrid(coords[3] | 0, coords[1] | 0, coords[2] | 0, JSON.parse(grid), function(err) {
+                    if (err) throw err;
+                    completed.written++;
+                    if (completed.written === 241) {
+                        mbtiles.stopWriting(function(err) {
+                            completed.stopped = true;
+                            if (err) throw err;
+                            verifyWritten();
+                        });
+                    }
+                });
+            });
+        }
+
+        function verifyWritten() {
+            fs.readdirSync(__dirname + '/fixtures/grids/').forEach(function(file) {
+                var coords = file.match(/^plain_2_(\d+)_(\d+)_(\d+).json$/);
+                if (coords) {
+                    // Flip Y coordinate because file names are TMS, but .getTile() expects XYZ.
+                    coords[2] = Math.pow(2, coords[3]) - 1 - coords[2];
+                    mbtiles.getGrid(coords[3] | 0, coords[1] | 0, coords[2] | 0, function(err, grid) {
+                        if (err) throw err;
+                        assert.deepEqual(JSON.stringify(grid), fs.readFileSync(__dirname + '/fixtures/grids/' + file, 'utf8'));
+                        completed.read++;
+                    });
+                }
+            });
+        }
+    });
+
+    beforeExit(function() {
+        assert.deepEqual({
+            open: true,
+            started: true,
+            written: 241,
+            read: 241,
+            stopped: true
+        }, completed);
+    })
+};