config: Improve error messages

Add labels to most Joi objects
Convert all auth variable insert names to upper case to prevent inconsistent naming of the variables
Rewrite auth errors to correctly point out the problematic variable
Add tests for the config utils functions

Signed-off-by: Philip Molares <philip.molares@udo.edu>

src/config/utils.spec.ts

@@ -0,0 +1,43 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import {
+  replaceAuthErrorsWithEnvironmentVariables,
+  toArrayConfig,
+} from './utils';
+
+describe('config utils', () => {
+  describe('toArrayConfig', () => {
+    it('empty', () => {
+      expect(toArrayConfig('')).toEqual([]);
+    });
+    it('one element', () => {
+      expect(toArrayConfig('one')).toEqual(['one']);
+    });
+    it('multiple elements', () => {
+      expect(toArrayConfig('one, two, three')).toEqual(['one', 'two', 'three']);
+    });
+    it('non default seperator', () => {
+      expect(toArrayConfig('one ; two ; three', ';')).toEqual([
+        'one',
+        'two',
+        'three',
+      ]);
+    });
+  });
+  describe('toArrayConfig', () => {
+    it('"gitlab[0].scope', () => {
+      expect(
+        replaceAuthErrorsWithEnvironmentVariables(
+          '"gitlab[0].scope',
+          'gitlab',
+          'HD_AUTH_GITLAB_',
+          ['test'],
+        ),
+      ).toEqual('"HD_AUTH_GITLAB_test_SCOPE');
+    });
+  });
+});