1 files changed, 41 insertions, 0 deletions
diff --git a/testing/xpcshell/node-ws/test/limiter.test.js b/testing/xpcshell/node-ws/test/limiter.test.js
new file mode 100644
index 0000000000..95141f0f5c
--- /dev/null
+++ b/testing/xpcshell/node-ws/test/limiter.test.js
@@ -0,0 +1,41 @@
+'use strict';
+
+const assert = require('assert');
+
+const Limiter = require('../lib/limiter');
+
+describe('Limiter', () => {
+  describe('#ctor', () => {
+    it('takes a `concurrency` argument', () => {
+      const limiter = new Limiter(0);
+
+      assert.strictEqual(limiter.concurrency, Infinity);
+    });
+  });
+
+  describe('#kRun', () => {
+    it('limits the number of jobs allowed to run concurrently', (done) => {
+      const limiter = new Limiter(1);
+
+      limiter.add((callback) => {
+        setImmediate(() => {
+          callback();
+
+          assert.strictEqual(limiter.jobs.length, 0);
+          assert.strictEqual(limiter.pending, 1);
+        });
+      });
+
+      limiter.add((callback) => {
+        setImmediate(() => {
+          callback();
+
+          assert.strictEqual(limiter.pending, 0);
+          done();
+        });
+      });
+
+      assert.strictEqual(limiter.jobs.length, 1);
+    });
+  });
+});