diff --git a/tests/phpunit/includes/testcase.php b/tests/phpunit/includes/testcase.php
index 1150bc0128..dc888740f6 100644
--- a/tests/phpunit/includes/testcase.php
+++ b/tests/phpunit/includes/testcase.php
@@ -55,9 +55,19 @@ class WP_UnitTestCase extends PHPUnit_Framework_TestCase {
 		add_filter( 'wp_die_handler', array( $this, 'get_wp_die_handler' ) );
 	}
 
+	/**
+	 * Detect post-test failure conditions.
+	 *
+	 * We use this method to detect expectedDeprecated and expectedIncorrectUsage annotations.
+	 *
+	 * @since 4.2.0
+	 */
+	protected function assertPostConditions() {
+		$this->expectedDeprecated();
+	}
+
 	function tearDown() {
 		global $wpdb, $wp_query, $post;
-		$this->expectedDeprecated();
 		$wpdb->query( 'ROLLBACK' );
 		if ( is_multisite() ) {
 			while ( ms_is_switched() ) {
@@ -224,24 +234,30 @@ class WP_UnitTestCase extends PHPUnit_Framework_TestCase {
 	}
 
 	function expectedDeprecated() {
+		$errors = array();
+
 		$not_caught_deprecated = array_diff( $this->expected_deprecated, $this->caught_deprecated );
 		foreach ( $not_caught_deprecated as $not_caught ) {
-			$this->fail( "Failed to assert that $not_caught triggered a deprecated notice" );
+			$errors[] = "Failed to assert that $not_caught triggered a deprecated notice";
 		}
 
 		$unexpected_deprecated = array_diff( $this->caught_deprecated, $this->expected_deprecated );
 		foreach ( $unexpected_deprecated as $unexpected ) {
-			$this->fail( "Unexpected deprecated notice for $unexpected" );
+			$errors[] = "Unexpected deprecated notice for $unexpected";
 		}
 
 		$not_caught_doing_it_wrong = array_diff( $this->expected_doing_it_wrong, $this->caught_doing_it_wrong );
 		foreach ( $not_caught_doing_it_wrong as $not_caught ) {
-			$this->fail( "Failed to assert that $not_caught triggered an incorrect usage notice" );
+			$errors[] = "Failed to assert that $not_caught triggered an incorrect usage notice";
 		}
 
 		$unexpected_doing_it_wrong = array_diff( $this->caught_doing_it_wrong, $this->expected_doing_it_wrong );
 		foreach ( $unexpected_doing_it_wrong as $unexpected ) {
-			$this->fail( "Unexpected incorrect usage notice for $unexpected" );
+			$errors[] = "Unexpected incorrect usage notice for $unexpected";
+		}
+
+		if ( ! empty( $errors ) ) {
+			$this->fail( implode( "\n", $errors ) );
 		}
 	}