Test empty header field (#30)

Zegnat · Nyholm · commit 5dfefb2da33c · 2018-09-02T12:01:55.000+02:00
Cannot use getHeaderLine here, as that defaults to an empty string.
diff --git a/src/MessageTrait.php b/src/MessageTrait.php
@@ -106,6 +106,10 @@ public function testWithHeader()
 
         $message = $initialMessage->withHeader('x-foo', ['bar', 'baz']);
         $this->assertRegExp('|bar, ?baz|', $message->getHeaderLine('x-foo'));
+
+        $message = $initialMessage->withHeader('Bar', '');
+        $this->assertTrue($message->hasHeader('Bar'));
+        $this->assertEquals([''], $message->getHeader('Bar'));
     }
 
     /**

Original file line number	Diff line number	Diff line change
`@@ -106,6 +106,10 @@ public function testWithHeader()`
`106`	`106`
`107`	`107`	`$message = $initialMessage->withHeader('x-foo', ['bar', 'baz']);`
`108`	`108`	`$this->assertRegExp('\|bar, ?baz\|', $message->getHeaderLine('x-foo'));`
	`109`	`+`
	`110`	`+ $message = $initialMessage->withHeader('Bar', '');`
	`111`	`+ $this->assertTrue($message->hasHeader('Bar'));`
	`112`	`+ $this->assertEquals([''], $message->getHeader('Bar'));`
`109`	`113`	`}`
`110`	`114`
`111`	`115`	`/**`