test: add signal test

Refs: #25

test.js

@@ -8,6 +8,7 @@ const tests = [
   'deadlock',
   'recursive-deadlock',
   'thread-main',
+  'signal',
 ];
 
 (async () => {

test/signal.js

@@ -0,0 +1,33 @@
+'use strict';
+
+const assert = require('assert').strict;
+const { locks, AbortController } = require('..');
+
+const sleep = msec =>
+  new Promise(resolve => {
+    setTimeout(() => {
+      resolve();
+    }, msec);
+  });
+
+module.exports = async () => {
+  const startTs = Date.now();
+
+  const abortController = new AbortController();
+  const options = { mode: 'exclusive', signal: abortController.signal };
+  let hasErrorOccurred = false;
+
+  setTimeout(() => abortController.abort(), 500);
+
+  await locks
+    .request('A', options, async () => {
+      await sleep(1000);
+    })
+    .catch(() => {
+      hasErrorOccurred = true;
+    });
+
+  const endTs = Date.now();
+  assert.strictEqual(endTs - startTs < 1000, true, 'Lock should be aborted');
+  assert.strictEqual(hasErrorOccurred, true, 'Error should  occur');
+};