Added babel plugins to support latest TS functionalities

test/servers/services/ServersImporter.test.ts

@@ -0,0 +1,39 @@
+import { Mock } from 'ts-mockery';
+import ServersImporter from '../../../src/servers/services/ServersImporter';
+import { RegularServer } from '../../../src/servers/data';
+
+describe('ServersImporter', () => {
+  const servers: RegularServer[] = [ Mock.all<RegularServer>(), Mock.all<RegularServer>() ];
+  const csvjsonMock = {
+    toObject: jest.fn().mockReturnValue(servers),
+  };
+  const readAsText = jest.fn();
+  const fileReaderMock = Mock.of<FileReader>({
+    readAsText,
+    addEventListener: (_eventName: string, listener: Function) => listener({ target: { result: '' } }),
+  });
+  const importer = new ServersImporter(csvjsonMock, () => fileReaderMock);
+
+  beforeEach(jest.clearAllMocks);
+
+  describe('importServersFromFile', () => {
+    it('rejects with error if no file was provided', async () => {
+      await expect(importer.importServersFromFile()).rejects.toEqual(
+        new Error('No file provided or file is not a CSV'),
+      );
+    });
+
+    it('rejects with error if provided file is not a CSV', async () => {
+      await expect(importer.importServersFromFile(Mock.of<File>({ type: 'text/html' }))).rejects.toEqual(
+        new Error('No file provided or file is not a CSV'),
+      );
+    });
+
+    it('reads file when a CSV is provided', async () => {
+      await importer.importServersFromFile(Mock.of<File>({ type: 'text/csv' }));
+
+      expect(readAsText).toHaveBeenCalledTimes(1);
+      expect(csvjsonMock.toObject).toHaveBeenCalledTimes(1);
+    });
+  });
+});