minor #19392 [BrowserKit] Added test for followRedirect method (POST method) (zomberg)

This PR was squashed before being merged into the 2.7 branch (closes #19392).

Discussion
----------

[BrowserKit] Added test for followRedirect method (POST method)

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | ~
| License       | MIT
| Doc PR        | ~

Test covers 'else' branches in these conditions:
```php
if (in_array($this->internalResponse->getStatus(), array(302, 303))) {
    $method = 'get';
    $files = array();
    $content = null;
} else {
    $method = $request->getMethod();
    $files = $request->getFiles();
    $content = $request->getContent();
}

if ('get' === strtolower($method)) {
    // Don't forward parameters for GET request as it should reach the redirection URI
    $parameters = array();
} else {
    $parameters = $request->getParameters();
}
```

Commits
-------

2ace5d8 [BrowserKit] Added test for followRedirect method (POST method)

Author: nicolas-grekas

src/Symfony/Component/BrowserKit/Tests/ClientTest.php

@@ -473,6 +473,26 @@ public function testFollowRedirectWithPort()
         $this->assertEquals($headers, $client->getRequest()->getServer());
     }
 
+    public function testFollowRedirectWithPostMethod()
+    {
+        $parameters = array('foo' => 'bar');
+        $files = array('myfile.foo' => 'baz');
+        $server = array('X_TEST_FOO' => 'bazbar');
+        $content = 'foobarbaz';
+
+        $client = new TestClient();
+
+        $client->setNextResponse(new Response('', 307, array('Location' => 'http://www.example.com/redirected')));
+        $client->request('POST', 'http://www.example.com/foo/foobar', $parameters, $files, $server, $content);
+
+        $this->assertEquals('http://www.example.com/redirected', $client->getRequest()->getUri(), '->followRedirect() follows a redirect with POST method');
+        $this->assertArrayHasKey('foo', $client->getRequest()->getParameters(), '->followRedirect() keeps parameters with POST method');
+        $this->assertArrayHasKey('myfile.foo', $client->getRequest()->getFiles(), '->followRedirect() keeps files with POST method');
+        $this->assertArrayHasKey('X_TEST_FOO', $client->getRequest()->getServer(), '->followRedirect() keeps $_SERVER with POST method');
+        $this->assertEquals($content, $client->getRequest()->getContent(), '->followRedirect() keeps content with POST method');
+        $this->assertEquals('POST', $client->getRequest()->getMethod(), '->followRedirect() keeps request method');
+    }
+
     public function testBack()
     {
         $client = new TestClient();