More unittests

src/App.php

@@ -37,14 +37,14 @@ class App
                 'options' => Expect::arrayOf('string', 'string')
             ]),
             'backup' => Expect::arrayOf(Expect::structure([
-                'title' => Expect::string(),
-                'source' => Expect::string(),
-                'destination' => Expect::string(),
-            ])),
+                'title' => Expect::string()->required(),
+                'source' => Expect::string()->required(),
+                'destination' => Expect::string()->required(),
+            ]))->required(),
             'notification' => Expect::arrayOf(Expect::structure([
-                'type' => Expect::string(),
-                'domain' => Expect::string(),
-                'topic' => Expect::string(),
+                'type' => Expect::string()->required(),
+                'domain' => Expect::string()->required(),
+                'topic' => Expect::string()->required(),
             ])),
             'log' => Expect::string()->assert(
                 function (string $path): bool {
@@ -53,17 +53,16 @@ class App
             ),
             'templates' => Expect::structure(
                 [
-                    'notify' => Expect::string(),
-                    'error' => Expect::string()
+                    'notify' => Expect::string()->required(),
+                    'error' => Expect::string()->required()
                 ]
-            )
+            )->required()
         ]);
 
         $parser = new Yaml();
         /** @var array<string, mixed> */
         $parsedConfig = $parser->parseFile($configFile);
 
-
         // Merge those values into the configuration schema:
         $this->config->merge($parsedConfig);