From a54414ac42a931f51175d0413deb00855c659b83 Mon Sep 17 00:00:00 2001
From: David Braun <David@NodeGuy.com>
Date: Wed, 11 Oct 2017 11:37:57 -0400
Subject: [PATCH] Add test/go/perm.js.

---
 test/go/perm.js | 78 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 test/go/perm.js

diff --git a/test/go/perm.js b/test/go/perm.js
new file mode 100644
index 0000000..8344478
--- /dev/null
+++ b/test/go/perm.js
@@ -0,0 +1,78 @@
+// errorcheck
+
+// 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 various correct and incorrect permutations of send-only,
+// receive-only, and bidirectional channels.
+
+'use strict'
+
+const assert = require(`@nodeguy/assert`)
+const Channel = require('../../lib')
+
+it(`perm`, function () {
+  const c = Channel()
+  const cr = Channel().readOnly()
+  const cs = Channel().writeOnly()
+
+  const n = 0
+
+  assert.throws(() => {
+    Channel.shift(n) // ERROR "receive from non-chan"
+  })
+
+  assert.throws(() => {
+    Channel.push(2, n) // ERROR "send to non-chan"
+  })
+
+  c.push(0) // ok
+  c.shift() // ok
+
+  assert.throws(() => {
+    cr.push(0) // ERROR "send"
+  })
+
+  cr.shift() // ok
+
+  cs.push(0) // ok
+
+  assert.throws(() => {
+    cs.shift() // ERROR "receive"
+  })
+
+  Channel.select(
+    c.push(0), // ok
+    c.shift()  // ok
+  )
+
+  assert.throws(() => {
+    Channel.select(
+      cr.push(0) // ERROR "send"
+    )
+  })
+
+  Channel.select(cr.shift()) // ok
+
+  Channel.select(cs.push(0)) // ok
+
+  assert.throws(() => {
+    Channel.select(cs.shift()) // ERROR "receive"
+  })
+
+  assert.throws(() => {
+    cs.forEach(() => {}) // ERROR "receive"
+  })
+
+  c.close()
+  cs.close()
+
+  assert.throws(() => {
+    cr.close() // ERROR "receive"
+  })
+
+  assert.throws(() => {
+    Channel.close(n) // ERROR "invalid operation.*non-chan type"
+  })
+})