Start testing the AngularJS application

Make the client-side code more modular to make it easier to test.
Only data-sources code and related services are concerned for now.

There are two new AngularJS modules:
- app.core contains services shared by all code (connection and pager)
- app.data-sources contains controllers and define routes related to
data sources.

AngularJS application code is tested using Karma, Jasmine and jsdom.
Server code is still tested using mocha, and mocha is updated to v6 to
be able to configure it in .mocharc.js

connection service has dropped its callback parameter. All existing
calls are now using the returned Promise.
It also dropped its showLoader parameter which was useless.

Unused Constants service is removed.

The new code follows some advices from this guide:
https://github.com/johnpapa/angular-styleguide/blob/master/a1/README.md

.eslintrc.js

@@ -4,6 +4,7 @@ module.exports = {
         browser: true,
         jquery: true,
         mocha: true,
+        jasmine: true,
     },
     globals: {
         // defined in server.js
@@ -23,6 +24,9 @@ module.exports = {
         angular: false,
         noty: false,
         layerUtils: false,
+
+        // Angular mocks
+        inject: false,
     },
     rules: {
         'no-console': 'off',

.mocharc.js

@@ -0,0 +1,5 @@
+module.exports = {
+    "no-colors": true,
+    "spec": 'test/server/**/*.js',
+    "timeout": 10000,
+};

karma.conf.js

@@ -0,0 +1,88 @@
+module.exports = function (config) {
+    config.set({
+
+        // base path that will be used to resolve all patterns (eg. files, exclude)
+        basePath: '',
+
+        // frameworks to use
+        // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
+        frameworks: ['jasmine'],
+
+        // list of files / patterns to load in the browser
+        files: [
+            'node_modules/jquery/dist/jquery.min.js',
+            'node_modules/jquery-validation/dist/jquery.validate.min.js',
+            'node_modules/components-jqueryui/jquery-ui.min.js',
+            'node_modules/bootstrap/dist/js/bootstrap.min.js',
+            'node_modules/angular/angular.min.js',
+            'node_modules/angular-sanitize/angular-sanitize.min.js',
+            'node_modules/angular-draganddrop/angular-draganddrop.min.js',
+            'node_modules/angular-route/angular-route.min.js',
+            'node_modules/noty/js/noty/packaged/jquery.noty.packaged.min.js',
+            'node_modules/angular-uuid2/dist/angular-uuid2.min.js',
+            'node_modules/angular-vs-repeat/src/angular-vs-repeat.min.js',
+            'node_modules/bootstrap-datepicker/dist/js/bootstrap-datepicker.min.js',
+            'node_modules/moment/min/moment.min.js',
+            'node_modules/angular-bootstrap-datetimepicker/src/js/datetimepicker.js',
+            'node_modules/numeral/min/numeral.min.js',
+            'node_modules/angular-ui-tree/dist/angular-ui-tree.min.js',
+            'node_modules/angular-file-saver/dist/angular-file-saver.bundle.min.js',
+            'node_modules/angular-ui-bootstrap/ui-bootstrap-tpls.min.js',
+            'node_modules/angular-ui-sortable/dist/sortable.min.js',
+            'node_modules/ui-select/dist/select.min.js',
+            'node_modules/angular-loading-overlay/dist/angular-loading-overlay.js',
+            'node_modules/angular-xeditable/dist/js/xeditable.min.js',
+            'node_modules/ng-file-upload/dist/ng-file-upload-shim.min.js',
+            'node_modules/ng-file-upload/dist/ng-file-upload.min.js',
+            'node_modules/angular-bootstrap-colorpicker/js/bootstrap-colorpicker-module.min.js',
+            'node_modules/malihu-custom-scrollbar-plugin/jquery.mCustomScrollbar.concat.min.js',
+            'node_modules/angular-gettext/dist/angular-gettext.min.js',
+            'node_modules/cynteka-pivot-table-jquery/dist/jquery.cy-pivot.min.js',
+            'public/js/webapp.js',
+            'public/js/core/core.module.js',
+            'public/js/data-sources/data-sources.module.js',
+            'public/js/**/*.js',
+            'node_modules/angular-mocks/angular-mocks.js',
+            'test/client/**/*.js',
+        ],
+
+        // list of files / patterns to exclude
+        exclude: [
+        ],
+
+        // preprocess matching files before serving them to the browser
+        // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
+        preprocessors: {
+        },
+
+        // test results reporter to use
+        // possible values: 'dots', 'progress'
+        // available reporters: https://npmjs.org/browse/keyword/karma-reporter
+        reporters: ['progress'],
+
+        // web server port
+        port: 9876,
+
+        // enable / disable colors in the output (reporters and logs)
+        colors: true,
+
+        // level of logging
+        // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
+        logLevel: config.LOG_INFO,
+
+        // enable / disable watching file and executing tests whenever any file changes
+        autoWatch: false,
+
+        // start these browsers
+        // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
+        browsers: ['jsdom'],
+
+        // Continuous Integration mode
+        // if true, Karma captures browsers, runs the tests and exits
+        singleRun: true,
+
+        // Concurrency level
+        // how many browser should be started simultaneous
+        concurrency: Infinity
+    });
+};