[Glitch] Storybook Helpers

Port c52848b444 to glitch-soc, kinda

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/test_helpers.tsx

@@ -1,60 +0,0 @@
-import PropTypes from 'prop-types';
-import type { PropsWithChildren } from 'react';
-import { Component } from 'react';
-
-import { IntlProvider } from 'react-intl';
-
-import { MemoryRouter } from 'react-router';
-
-// eslint-disable-next-line import/no-extraneous-dependencies
-import { render as rtlRender } from '@testing-library/react';
-
-class FakeIdentityWrapper extends Component<
-  PropsWithChildren<{ signedIn: boolean }>
-> {
-  static childContextTypes = {
-    identity: PropTypes.shape({
-      signedIn: PropTypes.bool.isRequired,
-      accountId: PropTypes.string,
-      disabledAccountId: PropTypes.string,
-    }).isRequired,
-  };
-
-  getChildContext() {
-    return {
-      identity: {
-        signedIn: this.props.signedIn,
-        accountId: '123',
-      },
-    };
-  }
-
-  render() {
-    return this.props.children;
-  }
-}
-
-function render(
-  ui: React.ReactElement,
-  { locale = 'en', signedIn = true, ...renderOptions } = {},
-) {
-  const Wrapper = (props: { children: React.ReactNode }) => {
-    return (
-      <MemoryRouter>
-        <IntlProvider locale={locale}>
-          <FakeIdentityWrapper signedIn={signedIn}>
-            {props.children}
-          </FakeIdentityWrapper>
-        </IntlProvider>
-      </MemoryRouter>
-    );
-  };
-  return rtlRender(ui, { wrapper: Wrapper, ...renderOptions });
-}
-
-// re-export everything
-// eslint-disable-next-line import/no-extraneous-dependencies
-export * from '@testing-library/react';
-
-// override render method
-export { render };