add test for shared database

test/shared.test.js

+var sqlite3 = require('..');
+var assert = require('assert');
+var fs = require('fs');
+
+describe('exec', function() {
+    var db;
+    before(function(done) {
+        db = new sqlite3.Database(':memory:',sqlite3.OPEN_SHAREDCACHE,done);
+    });
+
+    it('Database#exec', function(done) {
+        var sql = fs.readFileSync('test/support/script.sql', 'utf8');
+        db.exec(sql, done);
+    });
+
+    it('retrieve database structure', function(done) {
+        db.all("SELECT type, name FROM sqlite_master ORDER BY type, name", function(err, rows) {
+            if (err) throw err;
+            assert.deepEqual(rows, [
+                { type: 'index', name: 'grid_key_lookup' },
+                { type: 'index', name: 'grid_utfgrid_lookup' },
+                { type: 'index', name: 'images_id' },
+                { type: 'index', name: 'keymap_lookup' },
+                { type: 'index', name: 'map_index' },
+                { type: 'index', name: 'name' },
+                { type: 'table', name: 'grid_key' },
+                { type: 'table', name: 'grid_utfgrid' },
+                { type: 'table', name: 'images' },
+                { type: 'table', name: 'keymap' },
+                { type: 'table', name: 'map' },
+                { type: 'table', name: 'metadata' },
+                { type: 'view', name: 'grid_data' },
+                { type: 'view', name: 'grids' },
+                { type: 'view', name: 'tiles' }
+            ]);
+            done();
+        });
+    });
+});