Make messages positive

Author: wouterj

book/testing.rst

@@ -264,7 +264,7 @@ document::
                 'Content-Type',
                 'application/json'
             ),
-            '"Content-Type" header is NOT "application/json"' // optional message shown on failure
+            'the "Content-Type" header is "application/json"' // optional message shown on failure
         );
 
         // Assert that the response content contains a string
@@ -273,9 +273,7 @@ document::
         $this->assertRegExp('/foo(bar)?/', $client->getResponse()->getContent());
 
         // Assert that the response status code is 2xx
-        $this->assertTrue($client->getResponse()->isSuccessful(),
-                          'response status code is NOT 2xx'
-                          );
+        $this->assertTrue($client->getResponse()->isSuccessful(), 'response status is 2xx');
         // Assert that the response status code is 404
         $this->assertTrue($client->getResponse()->isNotFound());
         // Assert a specific 200 status code
@@ -287,7 +285,7 @@ document::
         // Assert that the response is a redirect to /demo/contact
         $this->assertTrue(
             $client->getResponse()->isRedirect('/demo/contact'),
-            'response is NOT a redirect to /demo/contact'
+            'response is a redirect to /demo/contact'
         );
         // ...or simply check that the response is a redirect to any URL
         $this->assertTrue($client->getResponse()->isRedirect());