test: fix asyncworker test so it runs on 6.x

PR-URL: #298
Fixes: #296
Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com>
Reviewed-By: Nicola Del Gobbo <nicoladelgobbo@NickNaso.local>

test/asyncworker.js

@@ -1,9 +1,22 @@
 'use strict';
 const buildType = process.config.target_defaults.default_configuration;
 const assert = require('assert');
-const async_hooks = require('async_hooks');
 const common = require('./common');
 
+// we only check async hooks on 8.x an higher were
+// they are closer to working properly
+const nodeVersion = process.versions.node.split('.')[0]
+let async_hooks = undefined;
+function checkAsyncHooks() {
+  if (nodeVersion >=8) {
+    if (async_hooks == undefined) {
+      async_hooks = require('async_hooks');
+    }
+    return true;
+  }
+  return false;
+}
+
 test(require(`./build/${buildType}/binding.node`));
 test(require(`./build/${buildType}/binding_noexcept.node`));
 
@@ -40,6 +53,22 @@ function installAsyncHooksForTest() {
 }
 
 function test(binding) {
+  if (!checkAsyncHooks()) {
+    binding.asyncworker.doWork(true, {}, function (e) {
+      assert.strictEqual(typeof e, 'undefined');
+      assert.strictEqual(typeof this, 'object');
+      assert.strictEqual(this.data, 'test data');
+    }, 'test data');
+
+    binding.asyncworker.doWork(false, {}, function (e) {
+      assert.ok(e instanceof Error);
+      assert.strictEqual(e.message, 'test error');
+      assert.strictEqual(typeof this, 'object');
+      assert.strictEqual(this.data, 'test data');
+    }, 'test data');
+    return;
+  }
+
   {
     const hooks = installAsyncHooksForTest();
     const triggerAsyncId = async_hooks.executionAsyncId();