test: crypto-domains avoid spurious failures

The order of the callbacks is non-deterministic, so don't expect the
error messages to come back in the same order every time, instead just
verify they are expected messages.

test/simple/test-crypto-domains.js

@@ -26,7 +26,9 @@ var d = domain.create();
 var expect = ['pbkdf2', 'randomBytes', 'pseudoRandomBytes']
 
 d.on('error', function (e) {
-  assert.equal(e.message, expect.shift());
+  var idx = expect.indexOf(e.message);
+  assert.notEqual(idx, -1, 'we should have error: ' + e.message);
+  expect.splice(idx, 1);
 });
 
 d.run(function () {
@@ -42,3 +44,7 @@ d.run(function () {
     throw new Error('pseudoRandomBytes');
   });
 });
+
+process.on('exit', function () {
+  assert.strictEqual(expect.length, 0, 'we should have seen all error messages');
+});