diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 97a4152..3a2f501 100755
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -92,3 +92,19 @@ if ( ! class_exists( 'WP_Query' ) ) {
         }
     }
 }
+
+// Stub WP text-processing functions used by image prompt builder.
+if ( ! function_exists( 'wp_strip_all_tags' ) ) {
+    function wp_strip_all_tags( $string, $remove_breaks = false ) {
+        $string = strip_tags( $string );
+        if ( $remove_breaks ) {
+            $string = preg_replace( '/[\r\n\t ]+/', ' ', $string );
+        }
+        return trim( $string );
+    }
+}
+if ( ! function_exists( 'sanitize_text_field' ) ) {
+    function sanitize_text_field( $str ) {
+        return trim( strip_tags( $str ) );
+    }
+}