Increase uniqueness in testSingleNowDates

Reduce instances of
AuthorizeNet failed for unknown reason.E00012: You have submitted a duplicate of Subscription 5642898. A duplicate subscription will not be created

tests/phpunit/CRM/Core/Payment/AuthorizeNetTest.php

@@ -53,8 +53,8 @@ public function tearDown() {
    * Test works but not both due to some form of caching going on in the SmartySingleton
    */
   public function testCreateSingleNowDated() {
-    $firstName = 'John_' . substr(sha1(rand()), 0, 7);
-    $lastName = 'Smith_' . substr(sha1(rand()), 0, 7);
+    $firstName = 'John_' . substr(sha1(rand()), 0, 7)  . uniqid();
+    $lastName = 'Smith_' . substr(sha1(rand()), 0, 7) . uniqid();
     $nameParams = array('first_name' => $firstName, 'last_name' => $lastName);
     $contactId = $this->individualCreate($nameParams);
 
@@ -145,7 +145,7 @@ public function testCreateSingleNowDated() {
       'first_name' => $firstName,
       'middle_name' => '',
       'last_name' => $lastName,
-      'street_address' => '8 Hobbiton Road',
+      'street_address' => '8 Hobbiton Road' .uniqid(),
       'city' => 'The Shire',
       'state_province' => 'IL',
       'postal_code' => 5010,