Ensure that configuration is loaded before using it

src/Configuration.php

@@ -107,20 +107,28 @@ public static function auto(?string $stage = null): Configuration
      * @param string $key
      * @param mixed|null $default
      *
+     * @throws ConfigurationException
+     *
      * @return mixed
      */
     public function get(string $key, mixed $default = null): mixed
     {
+        $this->ensureThatConfigurationIsLoaded();
+
         return $this->config->get($key, $default)->getValue();
     }
 
     /**
      * Gets all the tree config.
      *
+     * @throws ConfigurationException
+     *
      * @return array
      */
     public function all(): array
     {
+        $this->ensureThatConfigurationIsLoaded();
+
         return $this->config->toArray();
     }
 
@@ -411,4 +419,14 @@ private static function findDirectories(): string
 
         throw ConfigurationException::autoFindConfigurationDirFailed(self::$possibleLocations);
     }
+
+    /**
+     * @throws ConfigurationException
+     */
+    private function ensureThatConfigurationIsLoaded(): void
+    {
+        if (!isset($this->config)) {
+            throw ConfigurationException::configurationNotLoaded();
+        }
+    }
 }

src/Exception/ConfigurationException.php

@@ -20,14 +20,16 @@ public function __construct(string $message)
         parent::__construct(sprintf("%s\n\nDocumentation available here: %s", $message, self::SPECIFICATION_URI));
     }
 
-    /**
-     * @return self
-     */
     public static function operationNotAllowed(): self
     {
         return new self('Operation not allowed.');
     }
 
+    public static function configurationNotLoaded(): self
+    {
+        return new self('Configuration not loaded. Method `load` called?');
+    }
+
     /**
      * @param string $pattern
      * @param string $path
@@ -43,16 +45,6 @@ public static function filesNotFound(string $pattern, string $path, string $stag
         return new self("$one\n$two");
     }
 
-    /**
-     * @param string $path
-     *
-     * @return self
-     */
-    public static function pathNotFound(string $path): self
-    {
-        return new self("Path [$path] not found.");
-    }
-
     /**
      * @param string $stage
      * @param string $top