Map Size when Testing React Leaflet

I'm trying to test a custom react-leaflet component. It grabs the map element and uses a filter to get the number of elements visible at the current zoom level:

const visible = allPoints.filter(p => map.getBounds().contains(p));

This code works fine in the application, but when I try to test with Jest & Enzyme, the filter always returns 0 elements, regardless of zoom level. Poking at it a bit, I discovered that map.getSize() always returns 0x0 and map.getBounds() returns the same point for the southwest and northeast corners, which explains why it can't really contain any other points.

Is this just a bug in Enzyme or Leaflet or is there something that I need to do to set the map size explicitly?

import React from "react";
import { mount } from "enzyme";
import { act } from "react-dom/test-utils";
import { MapContext } from "../../../context";
import MarkersShown from "../markers-shown";
import { Map } from "react-leaflet";
import { mockParsed, mockCenter, mockData } from "./__data__";

describe("MarkersShown Tests", () => {
    it("renders the total asset count", async () => {
        const parsed = mockParsed;
        const center = mockCenter;
        let wrapper;
        await act(async () => {
            wrapper = mount(
                <MapContext.Provider value={mockData}>
                    <Map zoom={parsed.z} center={center} style={{ height: "100px", width: "100px" }}>
                        <MarkersShown />
                    </Map>
                </MapContext.Provider>
            );
        });
        wrapper.update();
        expect(wrapper.html()).toEqual(
            expect.stringMatching("Markers Shown of 3")
        );
    });
});