Actually test for having multiple headers with same name.

Author: lonnieezell

tests/HTTP/MessageTest.php

@@ -145,6 +145,21 @@ public function testBodyBasics()
 	}
 
 	//--------------------------------------------------------------------
-	
-	
+
+	public function testCanHaveMultipleHeadersWithSameName()
+	{
+		$this->message->setHeader('Line', 'foo1');
+		$this->message->setHeader('Line', 'foo2');
+
+		$headers = $this->message->getHeader('line');
+
+		$this->assertTrue(is_array($headers));
+		$this->assertEquals(2, count($headers));
+		$this->assertTrue($headers[0] instanceof \CodeIgniter\HTTP\Header);
+		$this->assertTrue($headers[1] instanceof \CodeIgniter\HTTP\Header);
+		$this->assertEquals('foo1', $headers[0]->getValueLine());
+		$this->assertEquals('foo2', $headers[1]->getValueLine());
+	}
+
+	//--------------------------------------------------------------------
 }