Fixed theme storage getting confused between tests

- When starting ghost for e2e tests we create a content folder in the os tmp dir
- This means that the folder can change between suites as ghost is started and restarted
- For the most part this is fine, but theme storage caches the path to config (which makes sense, it's not meant to change whilst Ghost is in-memory)
- This is a quick-n-dirty fix that just makes it possible to update that path in the tests, so we know it's in sync
- Ideally we'd not cache the path, use a function to fetch it etc, or fully reset the theme storage layer, but this is the fix I have working today
     and so it's going in to unblock things for now

core/server/services/themes/storage.js

@@ -148,5 +148,8 @@ module.exports = {
         let result = await getStorage().delete(themeName);
         list.del(themeName);
         return result;
+    },
+    updateStoragePath: function (storagePath) {
+        getStorage().storagePath = storagePath;
     }
 };

test/utils/e2e-framework.js

@@ -25,20 +25,23 @@ const redirectsUtils = require('./redirects');
 const configUtils = require('./configUtils');
 const mockManager = require('./e2e-framework-mock-manager');
 
+const themeStorage = require('../../core/server/services/themes/storage');
+
 const boot = require('../../core/boot');
 const TestAgent = require('./test-agent');
 const db = require('./db-utils');
 
 const startGhost = async () => {
     /**
-     * We never use the root content folder for testing!
-     * We use a tmp folder.
-     */
+         * We never use the root content folder for testing!
+         * We use a tmp folder.
+         */
     const contentFolder = path.join(os.tmpdir(), uuid.v4(), 'ghost-test');
     await prepareContentFolder({contentFolder});
 
     // NOTE: need to pass this config to the server instance
     configUtils.set('paths:contentPath', contentFolder);
+    themeStorage.updateStoragePath(configUtils.config.getContentPath('themes'));
 
     const defaults = {
         backend: true,

test/utils/e2e-utils.js

@@ -18,6 +18,7 @@ const urlService = require('../../core/server/services/url');
 const settingsService = require('../../core/server/services/settings');
 const routeSettingsService = require('../../core/server/services/route-settings');
 const themeService = require('../../core/server/services/themes');
+const themeStorage = require('../../core/server/services/themes/storage');
 const limits = require('../../core/server/services/limits');
 const customRedirectsService = require('../../core/server/services/redirects');
 
@@ -69,6 +70,7 @@ const prepareContentFolder = (options) => {
      * We use a tmp folder.
      */
     configUtils.set('paths:contentPath', contentFolderForTests);
+    themeStorage.updateStoragePath(configUtils.config.getContentPath('themes'));
 
     fs.ensureDirSync(contentFolderForTests);
     fs.ensureDirSync(path.join(contentFolderForTests, 'data'));