Setting the position of a sprite not working in SFML/Box2D - c++

Question

I'm trying to get physics working in SFML using Box2D, but for some reason I can't set the position of my sprite in my class.
I created a TestBox for my game, basically just a box that has physics, but it doesn't seem to be working. I am able to set the position of the box in my class constructor, but not in the update function I created.
So onto the code:
TestBox.h:
#pragma once
#include<Box2D/Box2D.h>
#include<SFML/Graphics.hpp>
#include<string>
#include<iostream>
class TestBox : public sf:: Drawable
{
public:
TestBox(b2World *world, std::string texturePath, float x, float y, float w, float h);
void update();
b2Body *getBody() { return body; }
b2Fixture *getFixture() { return fixture; }
private:
virtual void draw(sf::RenderTarget &target, sf::RenderStates states) const;
b2Body *body = nullptr;
b2Fixture *fixture = nullptr;
sf::Texture texture;
sf::Sprite boxSprite;
};
TestBox.cpp:
#include "TestBox.h"
TestBox::TestBox(b2World *world, std::string texturePath, float x, float y, float w, float h) {
b2BodyDef bodyDef;
bodyDef.type = b2_dynamicBody;
bodyDef.position.Set(x, y);
body = world->CreateBody(&bodyDef);
b2PolygonShape boxShape;
boxShape.SetAsBox(w / 2.0f, h / 2.0f);
b2FixtureDef fixtureDef;
fixtureDef.shape = &boxShape;
fixtureDef.density = 1.0f;
fixtureDef.friction = 0.3f;
fixture = body->CreateFixture(&fixtureDef);
texture.loadFromFile(texturePath.c_str());
boxSprite.setTexture(texture);
boxSprite.setOrigin(16.f, 16.f);
boxSprite.setPosition(30.0f * body->GetPosition().x, 30.0f * body->GetPosition().y);
boxSprite.setRotation(body->GetAngle() * 180 / b2_pi);
}
void TestBox::update() {
std::cout << boxSprite.getPosition().x << ", " << boxSprite.getPosition().y << std::endl;
boxSprite.setPosition(30.0f * body->GetPosition().x, 30.0f * body->GetPosition().y);
boxSprite.setRotation(body->GetAngle() * 180 / b2_pi);
}
void TestBox::draw(sf::RenderTarget &target, sf::RenderStates states) const {
target.draw(boxSprite, states);
}
So, I've tried to narrow down my problem as much as possible, and rule as much as I could out. Here is what I found:
I am able to set the position in the constructor, this works fine.
I have been checking the position of the Box2D body, the position of that changes fine.
I have checked the math:
30.0f * body->GetPosition().x
30.0f * body->GetPosition().y
this is accurate and works fine.
The update function does run, it prints normally.
The result of printing the position is always the start position
Let me know if I left out any information you could need.