add tests around mbTile SQKM calculation

test/zztile.sqkm.test.js

@@ -0,0 +1,61 @@
+'use strict';
+require('sqlite3').verbose();
+var tape = require('tape');
+var fs = require('fs');
+var os = require('os');
+var sinon = require('sinon');
+
+var fixtures = {
+    plain_1: __dirname + '/fixtures/plain_1.mbtiles'
+};
+
+tape('[tile.sqkm] should log sqkm in a stats file', function (assert) {
+    delete require.cache[require.resolve('..')];
+    process.env.BRIDGE_LOG_MAX_VTILE_BYTES_COMPRESSED = 1;
+    var MBTiles = require('../lib/mbtiles');
+    sinon.stub(process, 'exit');
+    process.on('exit', function() {
+        var assert = require('assert');
+        var expectedStats = {
+            '0': 508164394.24620897,
+            max: 7072,
+            total: 7.072,
+            count: 1
+        };
+
+        var actualStats = JSON.parse(fs.readFileSync(os.tmpdir() + '/tilelive-bridge-stats.json').toString());
+        assert.deepEqual(expectedStats, actualStats, 'stats should match');
+        fs.unlinkSync(os.tmpdir() + '/tilelive-bridge-stats.json');
+        delete process.env.BRIDGE_LOG_MAX_VTILE_BYTES_COMPRESSED;
+    });
+    new Promise(function (resolve, reject) {
+        new MBTiles(fixtures.plain_1, function (err, mbTiles) {
+            if (err) reject(err);
+            resolve(mbTiles);
+        });
+    })
+        .then(function (mbTiles) {
+            return new Promise(function (resolve, reject) {
+                mbTiles.getTile(0, 0, 0, function (error, tile, headers) {
+                    if (error) {
+                        assert.ifErr(error, 'should be empty');
+                        reject(error);
+                    }
+                    assert.deepEqual(
+                        tile,
+                        fs.readFileSync(
+                            __dirname + '/fixtures/images/plain_1_0_0_0.png'
+                        )
+                    );
+                    resolve(null);
+                });
+            });
+        })
+        .catch(function (error) {
+            console.log(error);
+        })
+        .finally(function () {
+            assert.end();
+            process.exit();
+        });
+});