diff --git a/src/wp-includes/Text/Diff.php b/src/wp-includes/Text/Diff.php
index b3c63afc5f859..0f13b0fe5a650 100644
--- a/src/wp-includes/Text/Diff.php
+++ b/src/wp-includes/Text/Diff.php
@@ -260,24 +260,24 @@ static function _getTempDir()
     function _check($from_lines, $to_lines)
     {
         if (serialize($from_lines) != serialize($this->getOriginal())) {
-            trigger_error("Reconstructed original does not match", E_USER_ERROR);
+            throw new Text_Exception("Reconstructed original does not match");
         }
         if (serialize($to_lines) != serialize($this->getFinal())) {
-            trigger_error("Reconstructed final does not match", E_USER_ERROR);
+            throw new Text_Exception("Reconstructed final does not match");
         }
 
         $rev = $this->reverse();
         if (serialize($to_lines) != serialize($rev->getOriginal())) {
-            trigger_error("Reversed original does not match", E_USER_ERROR);
+            throw new Text_Exception("Reversed original does not match");
         }
         if (serialize($from_lines) != serialize($rev->getFinal())) {
-            trigger_error("Reversed final does not match", E_USER_ERROR);
+            throw new Text_Exception("Reversed final does not match");
         }
 
         $prevtype = null;
         foreach ($this->_edits as $edit) {
             if ($prevtype !== null && $edit instanceof $prevtype) {
-                trigger_error("Edit sequence is non-optimal", E_USER_ERROR);
+                throw new Text_Exception("Edit sequence is non-optimal");
             }
             $prevtype = get_class($edit);
         }
diff --git a/src/wp-includes/Text/Exception.php b/src/wp-includes/Text/Exception.php
new file mode 100644
index 0000000000000..4bbe25dcb6744
--- /dev/null
+++ b/src/wp-includes/Text/Exception.php
@@ -0,0 +1,11 @@
+<?php
+/**
+ * Exception for errors from the Text_Diff package.
+ *
+ * {@internal This is a WP native addition to the external Text_Diff package.}
+ *
+ * @package WordPress
+ * @subpackage Text_Diff
+ */
+
+class Text_Exception extends Exception {}
diff --git a/src/wp-includes/wp-diff.php b/src/wp-includes/wp-diff.php
index 235b04b4bed08..4f4c2c6a159e1 100644
--- a/src/wp-includes/wp-diff.php
+++ b/src/wp-includes/wp-diff.php
@@ -15,6 +15,8 @@
 	require ABSPATH . WPINC . '/Text/Diff/Renderer.php';
 	/** Text_Diff_Renderer_inline class */
 	require ABSPATH . WPINC . '/Text/Diff/Renderer/inline.php';
+	/** Text_Exception class */
+	require ABSPATH . WPINC . '/Text/Exception.php';
 }
 
 require ABSPATH . WPINC . '/class-wp-text-diff-renderer-table.php';
diff --git a/tests/phpunit/tests/diff/Text_Diff_Check_Test.php b/tests/phpunit/tests/diff/Text_Diff_Check_Test.php
index dec8193ad0896..aa62e9cdd2317 100644
--- a/tests/phpunit/tests/diff/Text_Diff_Check_Test.php
+++ b/tests/phpunit/tests/diff/Text_Diff_Check_Test.php
@@ -23,6 +23,7 @@ final class Text_Diff_Check_Test extends WP_UnitTestCase {
 
 	public static function set_up_before_class() {
 		require_once ABSPATH . 'wp-includes/Text/Diff.php';
+		require_once ABSPATH . 'wp-includes/Text/Exception.php';
 	}
 
 	/**
@@ -34,4 +35,20 @@ public function test_check_passes_when_passed_same_input() {
 		$diff = new Text_Diff( 'auto', array( self::FILE_A, self::FILE_B ) );
 		$this->assertTrue( $diff->_check( self::FILE_A, self::FILE_B ) );
 	}
+
+	public function test_check_throws_exception_when_from_is_not_same_as_original() {
+		$this->expectException( Text_Exception::class );
+		$this->expectExceptionMessage( 'Reconstructed original does not match' );
+
+		$diff = new Text_Diff( 'auto', array( self::FILE_A, self::FILE_B ) );
+		$diff->_check( self::FILE_B, self::FILE_B );
+	}
+
+	public function test_check_throws_exception_when_to_is_not_same_as_final() {
+		$this->expectException( Text_Exception::class );
+		$this->expectExceptionMessage( 'Reconstructed final does not match' );
+
+		$diff = new Text_Diff( 'auto', array( self::FILE_A, self::FILE_B ) );
+		$diff->_check( self::FILE_A, self::FILE_A );
+	}
 }