fix: use case-insensitive string comparison for fast-track approvals (#658)

I noticed today that a PR that had sufficient fast-track approvals was
being rejected as needing one more approval. This is because one of the
approvers' had a GitHub handle where the case in the README
(`linkgoron`) did not match the case returned by GitHub (`Linkgoron`).
Since GitHub handles are case-insensitive, this change makes the
comparison case-insensitive.

One might be tempted to think that we need to do the same for the list
of TSC members, but handles are never compared there so it is not
necessary.

Author: Trott

lib/pr_checker.js

@@ -177,11 +177,11 @@ export default class PRChecker {
       }
       const [, requester] = comment.bodyText.match(FAST_TRACK_RE);
       const collaborators = Array.from(this.data.collaborators.values(),
-        (c) => c.login);
+        (c) => c.login.toLowerCase());
       const approvals = comment.reactions.nodes.filter((r) =>
         r.user.login !== requester &&
         r.user.login !== pr.author.login &&
-        collaborators.includes(r.user.login)).length;
+        collaborators.includes(r.user.login.toLowerCase())).length;
 
       if (requester === pr.author.login && approvals < 2) {
         cli.error('The fast-track request requires' +

test/fixtures/comments_with_two_fast_track_different_case.json

@@ -0,0 +1,16 @@
+[
+  {
+    "publishedAt": "2017-10-22T05:16:36.458Z",
+    "bodyText": "Fast-track has been requested by @bar. Please 👍 to approve.",
+    "author": {
+      "login": "github-actions"
+    },
+    "reactions": {
+      "nodes": [
+        { "user": { "login": "Bar" } },
+        { "user": { "login": "Foo" } },
+        { "user": { "login": "BAZ" } }
+      ]
+    }
+  }
+]

test/fixtures/data.js

@@ -37,6 +37,8 @@ export const requestingChangesReviews =
 export const commentsWithFastTrack = readJSON('comments_with_fast_track.json');
 export const commentsWithTwoFastTrack =
   readJSON('comments_with_two_fast_track.json');
+export const commentsWithTwoFastTrackDifferentCase =
+  readJSON('comments_with_two_fast_track_different_case.json');
 export const commentsWithFastTrackInsuffientApprovals =
   readJSON('comments_with_fast_track_insufficient_approvals.json');
 export const commentsWithCI = readJSON('comments_with_ci.json');

test/unit/pr_checker.test.js

@@ -18,6 +18,7 @@ import {
   noReviewers,
   commentsWithFastTrack,
   commentsWithTwoFastTrack,
+  commentsWithTwoFastTrackDifferentCase,
   commentsWithFastTrackInsuffientApprovals,
   commentsWithCI,
   commentsWithFailedCI,
@@ -582,6 +583,53 @@ describe('PRChecker', () => {
       cli.assertCalledWith(expectedLogs);
     });
 
+    it('should compare collaborator handles as case-insensitive', () => {
+      const cli = new TestCLI();
+
+      const expectedLogs = {
+        ok:
+         [['Approvals: 4'],
+           ['- Foo User (@foo): https://github.com/nodejs/node/pull/16438#pullrequestreview-71480624'],
+           ['- Quux User (@Quux): LGTM'],
+           ['- Baz User (@Baz): https://github.com/nodejs/node/pull/16438#pullrequestreview-71488236'],
+           ['- Bar User (@bar) (TSC): lgtm']],
+        info:
+         [['This PR was created on Fri, 30 Nov 2018 17:50:44 GMT'],
+           ['This PR is being fast-tracked']]
+      };
+
+      const pr = Object.assign({}, firstTimerPR, {
+        author: {
+          login: 'bar'
+        },
+        createdAt: LT_48H,
+        labels: {
+          nodes: [
+            { name: 'fast-track' }
+          ]
+        }
+      });
+
+      const data = {
+        pr,
+        reviewers: allGreenReviewers,
+        comments: commentsWithTwoFastTrackDifferentCase,
+        reviews: approvingReviews,
+        commits: [],
+        collaborators,
+        authorIsNew: () => true,
+        getThread() {
+          return PRData.prototype.getThread.call(this);
+        }
+      };
+      const checker = new PRChecker(cli, data, {}, argv);
+
+      cli.clearCalls();
+      const status = checker.checkReviewsAndWait(new Date(NOW));
+      assert(status);
+      cli.assertCalledWith(expectedLogs);
+    });
+
     it('should error with 1 fast-track approval from the pr author', () => {
       const cli = new TestCLI();