Add first batch of tests

test/metadata.js

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+describe('Metadata', function() {
+  describe('/index.json', function() {
+    it('is json', function(done) {
+      supertest(app)
+        .get('/index.json')
+        .expect(200)
+        .expect('Content-Type', /application\/json/, done);
+    });
+
+    it('is non-empty array', function(done) {
+      supertest(app)
+        .get('/index.json')
+        .expect(function(res) {
+          res.body.should.be.Array();
+          res.body.length.should.be.greaterThan(0);
+        }).end(done);
+    });
+  });
+});

test/setup.js

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+process.env.NODE_ENV = 'test';
+
+global.should = require('should');
+global.supertest = require('supertest');
+
+before(function(done) {
+  console.log('global setup');
+  process.chdir('test_data');
+  var running = require('../src/server')({
+    config: 'config.json',
+    port: 8888
+  }, done);
+  global.app = running.app;
+  global.server = running.server;
+});
+
+after(function() {
+  console.log('global teardown');
+  global.server.close(function() { console.log('Done'); });
+});

test/tiles_raster.js

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+var testTile = function(prefix, z, x, y, format, status, type) {
+  var path = '/' + prefix + '/' + z + '/' + x + '/' + y + '.' + format;
+  it(path + ' returns ' + status, function(done) {
+    var test = supertest(app).get(path);
+    if (status) test.expect(status);
+    if (type) test.expect('Content-Type', type);
+    test.end(done);
+  });
+};
+
+describe('Raster tiles', function() {
+  describe('existing tiles', function() {
+    testTile('test', 0, 0, 0, 'png', 200, /image\/png/);
+    testTile('test', 0, 0, 0, 'jpg',  200, /image\/jpeg/);
+    testTile('test', 0, 0, 0, 'jpeg',  200, /image\/jpeg/);
+    testTile('test', 0, 0, 0, 'webp',  200, /image\/webp/);
+
+    testTile('test', 1, 1, 1, 'png', 200);
+  });
+
+  describe('error tiles', function() {
+    testTile('non_existent', 0, 0, 0, 'png', 404);
+    testTile('test', -1, 0, 0, 'png', 404);
+    testTile('test', 0, 1, 0, 'png', 404);
+    testTile('test', 0, 0, 1, 'png', 404);
+    testTile('test', 0, 0, 1, 'gif', 404);
+  });
+});