properly display line-breaks in customer address fields

src/test/javascript/spec/app/shared/util/linebreaks-pipe.spec.ts

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+import { LinebreaksPipe } from 'app/shared/util/linebreaks-pipe';
+
+/* To run these tests in IntelliJ IDEA, you need a run configuration with
+    Configuration File:
+        ~/Projekte/Hostsharing/hsadmin-ng/src/test/javascript/jest.conf.js
+    and a Node Interpreter, e.g. if installed with nvm, this could be:
+        ~/.nvm/versions/node/v10.15.3/bin/node
+ */
+describe('LinebreaksPipe Tests', () => {
+    describe('LinebreaksPipe', () => {
+        let pipe: LinebreaksPipe;
+
+        beforeEach(() => {
+            pipe = new LinebreaksPipe();
+        });
+
+        it('converts null to null', () => {
+            expect(pipe.transform(null)).toBe(null);
+        });
+
+        it('converts empty string to empty string', () => {
+            expect(pipe.transform('')).toBe('');
+        });
+
+        it('converts string not containing line breaks to identical string', () => {
+            expect(pipe.transform('no linebreak here')).toBe('no linebreak here');
+        });
+
+        it('converts string containing line breaks to string containing <br/> by default', () => {
+            expect(pipe.transform('some\nlinebreaks\nhere')).toBe('some<br/>linebreaks<br/>here');
+        });
+
+        it('converts string containing line breaks string containing specified replacement', () => {
+            expect(pipe.transform('some\nlinebreaks\nhere', ' | ')).toBe('some | linebreaks | here');
+        });
+    });
+});