Preventing infinite loops when a requested option does not exist. (#8)

src/Chain.php

@@ -131,8 +131,13 @@ private function buildReturn(string $objectClass, $mock, string $method, array $
             } else {
                 $input = json_encode($myInputs);
             }
+            $actualReturn = $return->return($input);
 
-            $return = $this->buildReturn($objectClass, $mock, $method, $inputs, $return->return($input));
+            if (!isset($actualReturn)) {
+                throw new \Exception("Option {$input} does not exist.");
+            }
+
+            $return = $this->buildReturn($objectClass, $mock, $method, $inputs, $actualReturn);
         } elseif ($return instanceof \Exception) {
             throw $return;
         } elseif (is_string($return)) {

src/Options.php

@@ -2,6 +2,11 @@
 
 namespace MockChain;
 
+/**
+ * Class Options
+ * @package MockChain
+ * @todo Options for complex things, like objects.
+ */
 class Options
 {
 

test/ChainTest.php

@@ -105,4 +105,13 @@ public function testUsingAdddIncorrectly() {
       $this->expectExceptionMessage("You should use the add method before using addd.");
       (new Chain($this))->addd("hello");
     }
+
+    public function testNonExistentOption() {
+        $this->expectExceptionMessage('Option digestive does not exist');
+        $options = new Options();
+        $mock = (new Chain($this))
+            ->add(Body::class, 'getSystem', $options)
+            ->getMock();
+        $mock->getSystem("digestive");
+    }
 }