Claim bot: let me /unclaim my own issues (#1595)

An explicit /unclaim from the owner releases an owner-assigned issue; the sweep still never touches them.

scripts/claim/claim.js

@@ -223,8 +223,8 @@ async function unclaim(github, context) {
     await react(github, context, '+1'); // nothing to release
     return;
   }
-  if (assignees.includes(context.repo.owner)) {
-    await react(github, context, 'eyes'); // never touched by the bot
+  if (assignees.includes(context.repo.owner) && user !== context.repo.owner) {
+    await react(github, context, 'eyes'); // only the owner releases their own issues
     return;
   }
   const allowed = assignees.includes(user) || (await isMaintainer(github, context, user));

scripts/claim/claim.test.js

@@ -170,10 +170,13 @@ test('unclaim by a maintainer releases, by a stranger does not', async () => {
   assert.equal(find(w.calls, 'react')[1].content, 'eyes');
 });
 
-test('unclaim never touches an issue assigned to the owner', async () => {
-  const { github, calls } = fake();
-  await claim.handleComment({ github, context: ctx('/unclaim', { user: 'bherbruck', assignees: ['bherbruck'], labels: ['in progress'] }), now: NOW });
-  assert.equal(find(calls, 'removeLabel'), undefined);
+test('unclaim on an owner-assigned issue works only for the owner', async () => {
+  let w = fake();
+  await claim.handleComment({ github: w.github, context: ctx('/unclaim', { user: 'carol', assignees: ['bherbruck'], labels: ['in progress'] }), now: NOW });
+  assert.equal(find(w.calls, 'removeLabel'), undefined);
+  w = fake();
+  await claim.handleComment({ github: w.github, context: ctx('/unclaim', { user: 'bherbruck', assignees: ['bherbruck'], labels: ['in progress'] }), now: NOW });
+  assert.ok(find(w.calls, 'removeLabel'));
 });
 
 const issue = (number, assignees = ['bob']) => ({