MQE-1173: [Dev experience] Error on test generation without reference on file

- Made requested changes
- Updated unit tests to be a bit more descriptive

Author: aljcalandra

dev/tests/unit/Magento/FunctionalTestFramework/Util/ActionMergeUtilTest.php

@@ -13,7 +13,7 @@
 class ActionMergeUtilTest extends MagentoTestCase
 {
     /**
-     * Test Exception Handler
+     * Test Exception Handler for merging actions
      *
      * @throws \Exception
      */

dev/tests/unit/Magento/FunctionalTestFramework/Util/TestGeneratorTest.php

@@ -16,11 +16,11 @@
 class TestGeneratorTest extends MagentoTestCase
 {
     /**
-     * Basic test to validate array => test object conversion.
+     * Basic test to check exceptions for incorrect entities.
      *
      * @throws \Exception
      */
-    public function testGetTestObject()
+    public function testEntityException()
     {
         $actionObject = new ActionObject('fakeAction', 'comment', [
             'userInput' => '{{someEntity.entity}}'

src/Magento/FunctionalTestingFramework/Test/Objects/ActionObject.php

@@ -744,7 +744,7 @@ private function checkParameterCount($matches, $parameters, $reference)
             );
         } elseif (count($matches) == 0) {
             throw new TestReferenceException(
-                "Parameter Resolution Failed: No parameter matches found for reference " .
+                "Parameter Resolution Failed: No parameter matches found in parameterized element with selector " .
                 $reference,
                 ["reference" => $reference]
             );