SolidJS•4mo ago

Testing createResource with dynamic import

I'm trying to test an Icon component that I built that uses a dynamic import inside of a createResource. I attempted to mock createResource but couldn't get it to work as expected... I'll just post a simplified version of the component in the hopes that someone knows based off of the code. And FWIW I'm using vite-plugin-solid-svg to import svg files as solid components. Also, I was prompted to try to do this because I can run tests to get 100% coverage on statements, branches, and lines... but my function coverage was like 3%. It seems to be related to the dynamic import so perhaps I'm barking up the wrong tree with createResource?

import { createResource, Show } from "solid-js";

export function Icon(props) {
  const [lazyIcon] = createResource(
    () => props.icon,
    async (iconName) => {
      try {
        const lazyFile = await import(`./icons/icon-${iconName}.svg?component-solid`);
        return lazyFile.default;
      } catch {
        return null;
      }
    }
  );

  return (
    <Show when={lazyIcon()} fallback={<div />}>
      {(LoadedIcon) => (
        <div id={props.id}}>
          {LoadedIcon()}
        </div>
      )}
    </Show>
  );
}

import { createResource, Show } from "solid-js";

export function Icon(props) {
  const [lazyIcon] = createResource(
    () => props.icon,
    async (iconName) => {
      try {
        const lazyFile = await import(`./icons/icon-${iconName}.svg?component-solid`);
        return lazyFile.default;
      } catch {
        return null;
      }
    }
  );

  return (
    <Show when={lazyIcon()} fallback={<div />}>
      {(LoadedIcon) => (
        <div id={props.id}}>
          {LoadedIcon()}
        </div>
      )}
    </Show>
  );
}

1 Reply

flippyflopsOP•4mo ago

I ended up solving this but decided to ultimately just ignore the dynamic import testing. If anyone is curious about the implementation I had to test 100% here is what I had:

describe("<Icon />", () => {
 // concurrentIcons = import.meta.glob('./icons/*.svg) ... some mapping and filtering to get proper icon names
  for (const iconName of concurrentIcons) {
    test(
      `renders <Icon icon="${iconName}" />`,
      { retry: 5, concurrent: true },
      async ({ expect: localExpect }) => {
        const id = `test-${iconName}`;
        const { container, unmount } = render(() => (
          <Icon icon={iconName as IconType} id={id} />
        ));
        await waitFor(() => {
          localExpect(container.querySelector(`#${id}`)).toBeInTheDocument();
          unmount();
        });
      }
    );
  }
});

describe("<Icon />", () => {
 // concurrentIcons = import.meta.glob('./icons/*.svg) ... some mapping and filtering to get proper icon names
  for (const iconName of concurrentIcons) {
    test(
      `renders <Icon icon="${iconName}" />`,
      { retry: 5, concurrent: true },
      async ({ expect: localExpect }) => {
        const id = `test-${iconName}`;
        const { container, unmount } = render(() => (
          <Icon icon={iconName as IconType} id={id} />
        ));
        await waitFor(() => {
          localExpect(container.querySelector(`#${id}`)).toBeInTheDocument();
          unmount();
        });
      }
    );
  }
});

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Testing createResource with dynamic import