ENH Add lightweight test override for Environment::isCli()

src/Core/Environment.php

@@ -35,6 +35,13 @@ class Environment
      */
     protected static $env = [];
 
+    /**
+     * Used by unit tests to override `isCli()`
+     * This is not config. Use reflection to change the value
+     * @internal
+     */
+    private static ?bool $isCliOverride = null;
+
     /**
      * Extract env vars prior to modification
      *
@@ -251,6 +258,9 @@ class Environment
      */
     public static function isCli()
     {
+        if (self::$isCliOverride !== null) {
+            return self::$isCliOverride;
+        }
         return in_array(strtolower(php_sapi_name() ?? ''), ['cli', 'phpdbg']);
     }
 }