public function test_payment_remove_fee() {
    $payment = edd_get_payment( $this->_payment_id );
    $this->assertEmpty( $payment->fees );

    $payment->add_fee( array( 'amount' => 5, 'label' => 'Test Fee 1', 'type' => 'fee' ) );
    $payment->add_fee( array( 'amount' => 5, 'label' => 'Test Fee 2', 'type' => 'fee' ) );
    $payment->add_fee( array( 'amount' => 5, 'label' => 'Test Fee 3', 'type' => 'fee' ) );
    $payment->save();
    $this->assertEquals( 3, count( $payment->fees ) );
    $this->assertEquals( 'Test Fee 2', $payment->fees[1]['label'] );
    $this->assertEquals( 135, $payment->total );

    $payment->remove_fee( 1 );
    $payment->save();
    $this->assertEquals( 2, count( $payment->fees ) );
    $this->assertEquals( 130, $payment->total );
    $this->assertEquals( 'Test Fee 3', $payment->fees[1]['label'] );

    // Test that it saves to the DB
    $payment_meta = edd_get_payment_meta( $this->_payment_id, '_edd_payment_meta', true );
    $this->assertArrayHasKey( 'fees', $payment_meta );
    $fees = $payment_meta['fees'];
    $this->assertEquals( 2, count( $fees ) );
    $this->assertEquals( 'Test Fee 3', $fees[1]['label'] );
  }