Allow to push and prepend config values on new keys (#40723)

Author: danesteve

src/Illuminate/Config/Repository.php

@@ -99,7 +99,7 @@ public function set($key, $value = null)
      */
     public function prepend($key, $value)
     {
-        $array = $this->get($key);
+        $array = $this->get($key, []);
 
         array_unshift($array, $value);
 
@@ -115,7 +115,7 @@ public function prepend($key, $value)
      */
     public function push($key, $value)
     {
-        $array = $this->get($key);
+        $array = $this->get($key, []);
 
         $array[] = $value;
 

tests/Config/RepositoryTest.php

@@ -143,6 +143,18 @@ public function testPush()
         $this->assertSame('xxx', $this->repository->get('array.2'));
     }
 
+    public function testPrependWithNewKey()
+    {
+        $this->repository->prepend('new_key', 'xxx');
+        $this->assertSame(['xxx'], $this->repository->get('new_key'));
+    }
+
+    public function testPushWithNewKey()
+    {
+        $this->repository->push('new_key', 'xxx');
+        $this->assertSame(['xxx'], $this->repository->get('new_key'));
+    }
+
     public function testAll()
     {
         $this->assertSame($this->config, $this->repository->all());