radicle-explorer/src/BlockTimer.spec.ts

import BlockTimer from "./BlockTimer.svelte";
import { render } from "@testing-library/svelte";
import "@public/index.css";
import type { EventType, Listener } from "@ethersproject/abstract-provider";

describe("BlockTimer", () => {
  it("increases correctly the loading bar", () => {
    let block = 1;
    const props = {
      config: {
        provider: {
          on: (event: EventType, listener: Listener) => {
            if (event === "block") {
              listener(block);
            }
          },
        },
      },
      startBlock: 1,
      duration: 3,
    };

    const { rerender } = render(BlockTimer, props);

    cy.get("div.loader")
      .should("have.attr", "style", "width: 0%;")
      .then(() => {
        block += 1;
        rerender(props);
      });

    cy.get("div.loader")
      .last()
      .should("have.attr", "style", "width: 33%;")
      .then(() => {
        block += 1;
        rerender(props);
      });

    cy.get("div.loader")
      .last()
      .should("have.attr", "style", "width: 66%;")
      .then(() => {
        block += 1;
        rerender(props);
      });

    cy.get("div.loader")
      .last()
      .should("have.attr", "style", "width: 99%;")
      .then(() => {
        block += 1;
        rerender(props);
      });
  });
});