Initial release.

test/go/select.js

@@ -0,0 +1,73 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test simple select.
+
+'use strict'
+
+const Channel = require('../../lib')
+
+it(`select`, async function () {
+  const closed = Channel()
+  closed.close()
+  let counter = 0
+  let shift = 0
+
+  const GetValue = () => {
+    counter++
+    return 1 << shift
+  }
+
+  const Send = async (a, b) => {
+    let done = false
+    let i = 0
+
+    do {
+      switch (await Channel.select(a.push(GetValue()), b.push(GetValue()),
+        closed.shift())) {
+        case a:
+          i++
+          a = Channel()
+          break
+
+        case b:
+          i++
+          b = Channel()
+          break
+
+        default:
+          done = true
+      }
+
+      shift++
+    } while (!done)
+
+    return i
+  }
+
+  let a = Channel(1)
+  let b = Channel(1)
+  let v = await Send(a, b)
+
+  if (v !== 2) {
+    throw new Error(`Send returned ${v} !== 2`)
+  }
+
+  const av = await a.shift()
+  const bv = await b.shift()
+
+  if ((av | bv) !== 3) {
+    throw new Error(`bad values ${av} ${bv}`)
+  }
+
+  v = await Send(a, Channel())
+
+  if (v !== 1) {
+    throw new Error(`Send returned ${v} !== 1`)
+  }
+
+  if (counter !== 10) {
+    throw new Error(`counter is ${counter} !== 10`)
+  }
+})