😱 🚀 🎨 tests: use truncate instead of database deletion (#8119)

* 😱  🚀  🎨  tests: use truncate instead of delete the database

refs #7718, refs #7470

- should bring massive speed improvement
- could also fix random test failures (e.g. sqlite database is busy)

* gruntfile: add knex-migrator command in test-setup

Gruntfile.js

@@ -8,9 +8,15 @@
 
 // jshint unused: false
 var overrides      = require('./core/server/overrides'),
+    config         = require('./core/server/config'),
     _              = require('lodash'),
     chalk          = require('chalk'),
     fs             = require('fs-extra'),
+    KnexMigrator   = require('knex-migrator'),
+    knexMigrator = new KnexMigrator({
+        knexMigratorFilePath: config.get('paths:appRoot')
+    }),
+
     path           = require('path'),
 
     escapeChar     = process.platform.match(/^win/) ? '^' : '\\',
@@ -446,6 +452,13 @@ var overrides      = require('./core/server/overrides'),
             });
         });
 
+        /**
+         * Ensures the target database get's automatically created.
+         */
+        grunt.registerTask('knex-migrator', function () {
+            return knexMigrator.init({noScripts: true});
+        });
+
         // ### Validate
         // **Main testing task**
         //
@@ -499,7 +512,7 @@ var overrides      = require('./core/server/overrides'),
         // ### test-setup *(utility)(
         // `grunt test-setup` will run all the setup tasks required for running tests
         grunt.registerTask('test-setup', 'Setup ready to run tests',
-            ['clean:test', 'setTestEnv']
+            ['knex-migrator', 'clean:test', 'setTestEnv']
         );
 
         // ### Unit Tests *(sub task)*

core/test/functional/routes/frontend_spec.js

@@ -35,7 +35,9 @@ describe('Frontend Routing', function () {
     }
 
     function addPosts(done) {
-        testUtils.initData().then(function () {
+        testUtils.clearData().then(function () {
+            return testUtils.initData();
+        }).then(function () {
             return testUtils.fixtures.insertPostsAndTags();
         }).then(function () {
             done();
@@ -493,10 +495,10 @@ describe('Frontend Routing', function () {
         });
 
         describe('Site Map', function () {
-            before(testUtils.teardown);
-
             before(function (done) {
-                testUtils.initData().then(function () {
+                testUtils.clearData().then(function () {
+                    return testUtils.initData();
+                }).then(function () {
                     return testUtils.fixtures.insertPostsAndTags();
                 }).then(function () {
                     done();

core/test/utils/fork.js

@@ -49,6 +49,9 @@ function forkGhost(newConfig) {
         .then(function (_port) {
             port = _port;
 
+            return knexMigrator.reset();
+        })
+        .then(function () {
             return knexMigrator.init();
         })
         .then(function () {