Build/Test Tools: Move WP_UnitTestCase_Base::assertPostConditions() to a more appropriate place.

See #43218.

git-svn-id: https://develop.svn.wordpress.org/trunk@44719 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/includes/phpunit7/testcase.php

@@ -12,6 +12,7 @@ require_once dirname( dirname( __FILE__ ) ) . '/abstract-testcase.php';
  * All WordPress unit tests should inherit from this class.
  */
 class WP_UnitTestCase extends WP_UnitTestCase_Base {
+
 	/**
 	 * Asserts that a condition is not false.
 	 *