/**
  * @covers WindowsAzure\ServiceRuntime\RoleEnvironment::addRoleEnvironmentChangedListener
  * @covers WindowsAzure\ServiceRuntime\RoleEnvironment::removeRoleEnvironmentChangedListener
  */
 public function testAddRemoveRoleEnvironmentChangedListener()
 {
     RoleEnvironment::addRoleEnvironmentChangedListener('RoleEnvironmentTest::myFunction');
     // Removing succeeds
     $this->assertEquals(true, RoleEnvironment::removeRoleEnvironmentChangedListener('RoleEnvironmentTest::myFunction'));
     // Removing again fails
     $this->assertEquals(false, RoleEnvironment::removeRoleEnvironmentChangedListener('RoleEnvironmentTest::myFunction'));
 }