3 files changed, 27 insertions, 3 deletions
diff --git a/lambda-calcul/javascript/index.js b/lambda-calcul/javascript/index.js
index 5c080d1..c01c39e 100644
--- a/lambda-calcul/javascript/index.js
+++ b/lambda-calcul/javascript/index.js
@@ -23,7 +23,7 @@ const waitForEnterToBePressed = () => {
         output: process.stdout,
     });
 
-    return readlineInterface.question('Done. Press Enter to finish.')
+    return readlineInterface.question(`Done. Press Enter to unregister ${playerName}.`)
       .then(() => readlineInterface.close());
 };
 
@@ -34,4 +34,5 @@ client.start()
   })
   .then(() => solveNextChallenge(token))
   .then(() => waitForEnterToBePressed())
-  .then(() => console.log('Done done!'));
+  .then(() => client.unregister(token))
+  .then(() => console.log(`${playerName} unregistered!`));
diff --git a/lambda-calcul/javascript/src/client.js b/lambda-calcul/javascript/src/client.js
index 88ea253..08b967d 100644
--- a/lambda-calcul/javascript/src/client.js
+++ b/lambda-calcul/javascript/src/client.js
@@ -30,10 +30,16 @@ const newClient = ({
   })
     .then(({ data }) => data);
 
+  const unregister = (token) => axios({
+    method: 'DELETE',
+    url: `${challengerURL}/api/register?token=${token}`,
+  });
+
   return {
     nextChallenge,
     solve,
     start,
+    unregister,
   };
 };
 
diff --git a/lambda-calcul/javascript/test/client.test.js b/lambda-calcul/javascript/test/client.test.js
index 8b68a61..8a5ebff 100644
--- a/lambda-calcul/javascript/test/client.test.js
+++ b/lambda-calcul/javascript/test/client.test.js
@@ -40,7 +40,6 @@ describe('λ-calculator', () => {
   });
 
   it('retrieves next challenge', () => {
-
     challenger.on('request', (request, response) => {
       expect(request.method).toBe('GET');
       expect(request.url).toBe('/api/challenge?token=SomeToken');
@@ -80,4 +79,22 @@ describe('λ-calculator', () => {
     const client = LC.newClient({ parser, interpreter, printer });
     expect(client.solve('Some challenge')).toBe('Expression to print');
   });
+
+  it('unregisters user', () => {
+    let challengerCalled = false;
+
+    challenger.on('request', (request, response) => {
+      challengerCalled = true;
+      expect(request.method).toBe('DELETE');
+      expect(request.url).toBe('/api/register?token=SomeToken');
+      response.end();
+    });
+
+    const client = LC.newClient({
+      playerName: 'John Smith',
+      challengerURL: `http://localhost:${port}`,
+    });
+    return client.unregister('SomeToken')
+      .then(() => expect(challengerCalled).toBe(true));
+  });
 });