try defining horicromtal tests separately

centaur/src/it/scala/centaur/CentaurTestSuite.scala

@@ -32,6 +32,8 @@ object CentaurTestSuite extends StrictLogging {
 
   def isPapiUpgradeTest(testCase: CentaurTestCase): Boolean = testCase.containsTag("papi_upgrade")
 
+  def isHoricromtalTest(testCase: CentaurTestCase): Boolean = testCase.containsTag("horicromtal")
+
   /** Horicromtality-related assertion config. */
   val cromwellTracker: Option[CromwellTracker] = {
 

centaur/src/it/scala/centaur/HoricromtalTestCaseSpec.scala

@@ -0,0 +1,15 @@
+package centaur
+
+import centaur.test.standard.CentaurTestCase
+import org.scalatest.DoNotDiscover
+
+@DoNotDiscover
+class HoricromtalTestCaseSpec(cromwellBackends: List[String])
+  extends AbstractCentaurTestCaseSpec(cromwellBackends) {
+
+  def this() = this(CentaurTestSuite.cromwellBackends)
+
+  def testType: String = "Horicromtal"
+
+  def isMatchingHoricromtalTest(testCase: CentaurTestCase): Boolean = CentaurTestSuite.isHoricromtalTest(testCase)
+}