Add electron tests in Appveyor.

scripts/build-appveyor.bat

@@ -161,6 +161,13 @@ ECHO installing electron
 CALL npm install -g "electron@%NODE_RUNTIME_VERSION%"
 ECHO installing electron-mocha
 CALL npm install -g electron-mocha
+ECHO preparing tests
+(
+    ECHO var {app} = require('electron'^);
+    ECHO require('./createdb.js'^)(function (^) { app.quit(^); }^);
+) >"test\support\createdb-electron.js"
+CALL electron "test/support/createdb-electron.js"
+DEL "test\support\createdb-electron.js"
 ECHO calling electron-mocha
 CALL electron-mocha -R spec --timeout 480000
 IF %ERRORLEVEL% NEQ 0 GOTO ERROR

test/support/createdb.js

 #!/usr/bin/env node
 
-var existsSync = require('fs').existsSync || require('path').existsSync;
-var path = require('path');
+function createdb(callback) {
+    var existsSync = require('fs').existsSync || require('path').existsSync;
+    var path = require('path');
 
-var sqlite3 = require('../../lib/sqlite3');
+    var sqlite3 = require('../../lib/sqlite3');
 
-var count = 1000000;
-var db_path = path.join(__dirname,'big.db');
+    var count = 1000000;
+    var db_path = path.join(__dirname,'big.db');
 
-function randomString() {
+    function randomString() {
         var str = '';
         var chars = 'abcdefghijklmnopqrstuvwxzyABCDEFGHIJKLMNOPQRSTUVWXZY0123456789  ';
         for (var i = Math.random() * 100; i > 0; i--) {
             str += chars[Math.floor(Math.random() * chars.length)];
         }
         return str;
-};
+    };
 
 
-if (existsSync(db_path)) {
+    if (existsSync(db_path)) {
         console.log('okay: database already created (' + db_path + ')');
-} else {
+        if (callback) callback();
+    } else {
         console.log("Creating test database... This may take several minutes.");
         var db = new sqlite3.Database(db_path);
         db.serialize(function() {
@@ -31,6 +33,15 @@ if (existsSync(db_path)) {
                 stmt.run(i, randomString());
             }
             stmt.finalize();
-        db.run("COMMIT TRANSACTION");
+            db.run("COMMIT TRANSACTION", [], function () {
+                db.close(callback);
+            });
         });
+    }
+};
+
+if (require.main === module) {
+    createdb();
 }
+
+module.exports = createdb;