/**
  * @covers Smsglobal\RestApiClient\Http\HeaderBag::contains
  */
 public function testContains()
 {
     $bag = new HeaderBag(array('foo' => 'bar', 'fuzz' => 'bizz'));
     $this->assertTrue($bag->contains('foo', 'bar'), '->contains first value');
     $this->assertTrue($bag->contains('fuzz', 'bizz'), '->contains second value');
     $this->assertFalse($bag->contains('nope', 'nope'), '->contains unknown value');
     $this->assertFalse($bag->contains('foo', 'nope'), '->contains unknown value');
     // Multiple values
     $bag->set('foo', 'bor', false);
     $this->assertTrue($bag->contains('foo', 'bar'), '->contains first value');
     $this->assertTrue($bag->contains('foo', 'bor'), '->contains second value');
     $this->assertFalse($bag->contains('foo', 'nope'), '->contains unknown value');
 }