diff --git a/src/index.test.ts b/src/index.test.ts
index 0bae1bc..89c5be4 100644
--- a/src/index.test.ts
+++ b/src/index.test.ts
@@ -1,7 +1,107 @@
+import axios from 'axios';
+import * as crypto from 'crypto';
+
 import Iris from '.';
+import IrisDataRequestDTO from './types/dto/IrisDataRequestDTO';
+import IrisContactsEvents from './types/IrisContactsEvents';
+
+jest.mock('axios');
+const mockedAxios = axios as jest.Mocked<typeof axios>;
 
 describe('index', () => {
+  let privateKey: string;
+  let publicKey: string;
+  let dataRequest: IrisDataRequestDTO;
+  const submission: IrisContactsEvents = {
+    contacts: {
+      contactPersons: [],
+      dataProvider: {
+        firstName: 'Hans',
+        lastName: 'Müller',
+      },
+    },
+    events: {
+      events: [],
+      dataProvider: {
+        firstName: 'Hans',
+        lastName: 'Müller',
+      },
+    },
+  };
+  beforeAll((done) => {
+    mockedAxios.create.mockImplementation(() => {
+      return mockedAxios;
+    });
+    crypto.generateKeyPair(
+      'rsa',
+      {
+        modulusLength: 4096,
+        publicKeyEncoding: {
+          type: 'spki',
+          format: 'pem',
+        },
+        privateKeyEncoding: {
+          type: 'pkcs8',
+          format: 'pem',
+          cipher: 'aes-256-cbc',
+          passphrase: 'top secret',
+        },
+      },
+      (err, pub, priv) => {
+        publicKey = pub;
+        privateKey = priv;
+        dataRequest = {
+          healthDepartment: 'Test Health Department',
+          keyOfHealthDepartment: publicKey,
+          keyReferenz: 'random-string-keyref',
+          start: '2011-10-05T14:48:00.000Z',
+          end: '2021-10-05T14:48:00.000Z',
+        };
+        done(err);
+      },
+    );
+  });
   it('provides the Iris class', () => {
     expect(new Iris({})).toBeDefined();
   });
+
+  it('can retrieve a data request and send a corresponding data submission', async () => {
+    mockedAxios.get.mockResolvedValue({ status: 200, data: dataRequest });
+
+    const iris = new Iris({});
+    const dataRequestResult = await iris.getDataRequest('12345-abcde');
+    expect(dataRequestResult).toEqual({
+      healthDepartment: 'Test Health Department',
+      start: '2011-10-05T14:48:00.000Z',
+      end: '2021-10-05T14:48:00.000Z',
+    });
+    expect(mockedAxios.get).toHaveBeenCalledWith('/data-requests/12345-abcde');
+
+    mockedAxios.post.mockResolvedValue({ status: 200, data: { success: true } });
+    await iris.sendContactsEvents('12345-abcde', submission, {
+      firstName: 'Hans',
+      lastName: 'Müller',
+      birthDate: '1963-01-05T14:48:00.000Z',
+    });
+    expect(mockedAxios.post).toHaveBeenCalledWith('/data-submissions/12345-abcde/contacts_events', {
+      checkCode: [expect.any(String), expect.any(String)],
+      secret: expect.any(String),
+      keyReferenz: 'random-string-keyref',
+      encryptedData: expect.any(String),
+      nonce: expect.any(String),
+    });
+    const submittedData = mockedAxios.post.mock.calls[0][1];
+
+    expect(submittedData.checkCode[0]).toEqual(crypto.createHash('md5').update('hansmller').digest('base64'));
+    expect(submittedData.checkCode[1]).toEqual(crypto.createHash('md5').update('19630105').digest('base64'));
+
+    const symmetricKey = crypto.privateDecrypt(
+      { key: privateKey, passphrase: 'top secret' },
+      Buffer.from(submittedData.secret, 'base64'),
+    );
+    const decipher = crypto.createDecipheriv('AES-256-CBC', symmetricKey, Buffer.from(submittedData.nonce, 'base64'));
+    let receivedPlaintext = decipher.update(submittedData.encryptedData, 'base64', 'utf8');
+    receivedPlaintext += decipher.final();
+    expect(JSON.parse(receivedPlaintext)).toEqual(submission);
+  });
 });