[9.x] Add newLine to Stringable (#41622)

* Add a method to append a new line.

* Add test.

Author: paulandroshchuk

src/Illuminate/Support/Stringable.php

@@ -64,6 +64,16 @@ public function append(...$values)
         return new static($this->value.implode('', $values));
     }
 
+    /**
+     * Append a new line to the string.
+     *
+     * @return $this
+     */
+    public function newLine()
+    {
+        return $this->append(PHP_EOL);
+    }
+
     /**
      * Transliterate a UTF-8 value to ASCII.
      *

tests/Support/SupportStringableTest.php

@@ -419,6 +419,11 @@ public function testAscii()
         $this->assertSame('u', (string) $this->stringable('ü')->ascii());
     }
 
+    public function testNewLine()
+    {
+        $this->assertSame('Laravel'.PHP_EOL, (string) $this->stringable('Laravel')->newLine());
+    }
+
     public function testAsciiWithSpecificLocale()
     {
         $this->assertSame('h H sht Sht a A ia yo', (string) $this->stringable('х Х щ Щ ъ Ъ иа йо')->ascii('bg'));