CRM-20958 - api_v3_CaseTest::testCaseUpdate - Ignore creation/modific…

…ation date.

Checking the `modified_date` is a bit racy -- depending on sub-second
performance/alignment, the original `Case` creation and the subsequent
`Case` update may have the same `modified_date` or may have different
`modified_date`.

tests/phpunit/api/v3/CaseTest.php

@@ -163,8 +163,13 @@ public function testCaseUpdate() {
     $params['subject'] = $case['subject'] = 'Something Else';
     $this->callAPISuccess('case', 'create', $params);
 
-    // Verify that updated case is exactly equal to the original with new subject.
+    // Verify that updated case is equal to the original with new subject.
     $result = $this->callAPISuccessGetSingle('Case', array('case_id' => $id));
+    // Modification dates are likely to differ by 0-2 sec. Check manually.
+    $this->assertTrue($result['modified_date'] >= $case['modified_date']);
+    unset($result['modified_date']);
+    unset($case['modified_date']);
+    // Everything else should be identical.
     $this->assertAPIArrayComparison($result, $case);
   }