minor #2243 fix RequestBodyParamConverter tests (xabbuh)

This PR was merged into the 2.x branch.

Discussion
----------

fix RequestBodyParamConverter tests

Commits
-------

6e485c0 fix RequestBodyParamConverter tests

Author: xabbuh

Tests/Request/RequestBodyParamConverterTest.php

@@ -138,7 +138,7 @@ public function testRequestAttribute()
              ->expects($this->once())
              ->method('deserialize')
              ->willReturn('Object');
-        $request = $this->createRequest();
+        $request = $this->createRequest(null, 'application/json');
         $this->launchExecution($converter, $request);
         $this->assertEquals('Object', $request->attributes->get('foo'));
     }
@@ -159,7 +159,7 @@ public function testValidatorParameters()
 
         $converter = new RequestBodyParamConverter($this->serializer, null, null, $validator, 'errors');
 
-        $request = $this->createRequest();
+        $request = $this->createRequest(null, 'application/json');
         $configuration = $this->createConfiguration(null, null, ['validator' => ['groups' => ['foo']]]);
         $this->launchExecution($converter, $request, $configuration);
         $this->assertEquals('fooError', $request->attributes->get('errors'));
@@ -179,7 +179,7 @@ public function testValidatorSkipping()
 
         $converter = new RequestBodyParamConverter($this->serializer, null, null, $validator, 'errors');
 
-        $request = $this->createRequest();
+        $request = $this->createRequest(null, 'application/json');
         $configuration = $this->createConfiguration(null, null, ['validate' => false]);
         $this->launchExecution($converter, $request, $configuration);
         $this->assertNull($request->attributes->get('errors'));
@@ -277,7 +277,6 @@ public function testNoContentTypeCausesUnsupportedMediaTypeException()
     {
         $converter = new RequestBodyParamConverter($this->serializer);
         $request = $this->createRequest();
-        $request->headers->remove('CONTENT_TYPE');
         $this->expectException(UnsupportedMediaTypeHttpException::class);
         $this->launchExecution($converter, $request);
     }