AC-1422: "Random" unit test failure

- Move indexer tests to own suite

Author: xmav

dev/tests/unit/phpunit.xml.dist

@@ -28,6 +28,10 @@
         <testsuite name="Magento_Unit_Tests_App_Code">
             <directory>../../../app/code/*/*/Test/Unit</directory>
             <directory>../../../vendor/magento/module-*/Test/Unit</directory>
+            <exclude>../../../app/code/Magento/Indexer/Test/Unit</exclude>
+        </testsuite>
+        <testsuite name="Magento_Unit_Tests_App_Code_Indexer">
+            <directory>../../../app/code/Magento/Indexer/Test/Unit</directory>
         </testsuite>
         <testsuite name="Magento_Unit_Tests_Other">
             <directory>../../../lib/internal/*/*/Test/Unit</directory>