Initial commit

node_modules/events/tests/events-once.js

@@ -0,0 +1,100 @@
+'use strict';
+
+var common = require('./common');
+var EventEmitter = require('../').EventEmitter;
+var once = require('../').once;
+var assert = require('assert');
+
+function onceAnEvent() {
+  var ee = new EventEmitter();
+
+  process.nextTick(function () {
+    ee.emit('myevent', 42);
+  });
+
+  return once(ee, 'myevent').then(function (args) {
+    var value = args[0]
+    assert.strictEqual(value, 42);
+    assert.strictEqual(ee.listenerCount('error'), 0);
+    assert.strictEqual(ee.listenerCount('myevent'), 0);
+  });
+}
+
+function onceAnEventWithTwoArgs() {
+  var ee = new EventEmitter();
+
+  process.nextTick(function () {
+    ee.emit('myevent', 42, 24);
+  });
+
+  return once(ee, 'myevent').then(function (value) {
+    assert.strictEqual(value.length, 2);
+    assert.strictEqual(value[0], 42);
+    assert.strictEqual(value[1], 24);
+  });
+}
+
+function catchesErrors() {
+  var ee = new EventEmitter();
+
+  var expected = new Error('kaboom');
+  var err;
+  process.nextTick(function () {
+    ee.emit('error', expected);
+  });
+
+  return once(ee, 'myevent').then(function () {
+    throw new Error('should reject')
+  }, function (err) {
+    assert.strictEqual(err, expected);
+    assert.strictEqual(ee.listenerCount('error'), 0);
+    assert.strictEqual(ee.listenerCount('myevent'), 0);
+  });
+}
+
+function stopListeningAfterCatchingError() {
+  var ee = new EventEmitter();
+
+  var expected = new Error('kaboom');
+  var err;
+  process.nextTick(function () {
+    ee.emit('error', expected);
+    ee.emit('myevent', 42, 24);
+  });
+
+  // process.on('multipleResolves', common.mustNotCall());
+
+  return once(ee, 'myevent').then(common.mustNotCall, function (err) {
+    // process.removeAllListeners('multipleResolves');
+    assert.strictEqual(err, expected);
+    assert.strictEqual(ee.listenerCount('error'), 0);
+    assert.strictEqual(ee.listenerCount('myevent'), 0);
+  });
+}
+
+function onceError() {
+  var ee = new EventEmitter();
+
+  var expected = new Error('kaboom');
+  process.nextTick(function () {
+    ee.emit('error', expected);
+  });
+
+  return once(ee, 'error').then(function (args) {
+    var err = args[0]
+    assert.strictEqual(err, expected);
+    assert.strictEqual(ee.listenerCount('error'), 0);
+    assert.strictEqual(ee.listenerCount('myevent'), 0);
+  });
+}
+
+Promise.all([
+  onceAnEvent(),
+  onceAnEventWithTwoArgs(),
+  catchesErrors(),
+  stopListeningAfterCatchingError(),
+  onceError()
+]).catch(function (err) {
+  console.error(err.stack)
+  process.exit(1)
+});