diff --git a/tests/phpunit/tests/load/wpStartScrapingEditedFileErrors.php b/tests/phpunit/tests/load/wpStartScrapingEditedFileErrors.php
new file mode 100644
index 0000000000000..91fdb5b52249c
--- /dev/null
+++ b/tests/phpunit/tests/load/wpStartScrapingEditedFileErrors.php
@@ -0,0 +1,119 @@
+<?php
+
+/**
+ * Tests for wp_start_scraping_edited_file_errors().
+ *
+ * @group load
+ *
+ * @covers ::wp_start_scraping_edited_file_errors
+ */
+class Tests_Load_WpStartScrapingEditedFileErrors extends WP_UnitTestCase {
+
+	/**
+	 * Original $_REQUEST scrape values.
+	 *
+	 * @var array
+	 */
+	private $original_request = array();
+
+	public function set_up() {
+		parent::set_up();
+
+		foreach ( array( 'wp_scrape_key', 'wp_scrape_nonce' ) as $key ) {
+			$this->original_request[ $key ] = array_key_exists( $key, $_REQUEST ) ? $_REQUEST[ $key ] : null;
+			unset( $_REQUEST[ $key ] );
+		}
+	}
+
+	public function tear_down() {
+		foreach ( $this->original_request as $key => $value ) {
+			if ( null !== $value ) {
+				$_REQUEST[ $key ] = $value;
+			} else {
+				unset( $_REQUEST[ $key ] );
+			}
+		}
+
+		parent::tear_down();
+	}
+
+	/**
+	 * @ticket 65819
+	 */
+	public function test_returns_early_without_scrape_request_params() {
+		// Other tests in the same run may already have defined the constant,
+		// so check that this call does not change its state.
+		$was_defined = defined( 'WP_SANDBOX_SCRAPING' );
+
+		$this->expectOutputString( '' );
+
+		wp_start_scraping_edited_file_errors();
+
+		$this->assertSame( $was_defined, defined( 'WP_SANDBOX_SCRAPING' ) );
+	}
+
+	/**
+	 * @ticket 65819
+	 */
+	public function test_returns_early_when_scrape_params_are_empty() {
+		$_REQUEST['wp_scrape_key']   = '';
+		$_REQUEST['wp_scrape_nonce'] = '';
+
+		$was_defined = defined( 'WP_SANDBOX_SCRAPING' );
+
+		$this->expectOutputString( '' );
+
+		wp_start_scraping_edited_file_errors();
+
+		$this->assertSame( $was_defined, defined( 'WP_SANDBOX_SCRAPING' ) );
+	}
+
+	/**
+	 * @ticket 65819
+	 */
+	public function test_returns_early_when_scrape_transient_is_missing() {
+		$_REQUEST['wp_scrape_key']   = 'missingkey1234567890123456789012';
+		$_REQUEST['wp_scrape_nonce'] = 'nonce-value';
+
+		$was_defined = defined( 'WP_SANDBOX_SCRAPING' );
+
+		// A nonce mismatch would print an error and die, so returning quietly
+		// proves the missing transient path was taken.
+		$this->expectOutputString( '' );
+
+		wp_start_scraping_edited_file_errors();
+
+		$this->assertSame( $was_defined, defined( 'WP_SANDBOX_SCRAPING' ) );
+	}
+
+	/**
+	 * Only this test defines WP_SANDBOX_SCRAPING, so it is the only one that
+	 * needs its own process.
+	 *
+	 * @ticket 65819
+	 *
+	 * @runInSeparateProcess
+	 * @preserveGlobalState disabled
+	 */
+	public function test_defines_sandbox_scraping_when_nonce_matches() {
+		$key   = 'matchingkey12345678901234567890';
+		$nonce = 'nonce-value';
+
+		set_transient( 'scrape_key_' . $key, $nonce, 60 );
+
+		$_REQUEST['wp_scrape_key']   = $key;
+		$_REQUEST['wp_scrape_nonce'] = $nonce;
+
+		// A matching nonce registers wp_finalize_scraping_edited_file_errors() as a
+		// shutdown function. It prints the scrape markers when this child process
+		// exits, after PHPUnit has already recorded the test result. This is safe
+		// because the test runs in an isolated process, so the output does not
+		// affect the result or any other test.
+		wp_start_scraping_edited_file_errors();
+
+		$this->assertTrue( defined( 'WP_SANDBOX_SCRAPING' ) );
+		$this->assertTrue( WP_SANDBOX_SCRAPING );
+
+		delete_transient( 'scrape_key_' . $key );
+	}
+}