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Issue with theme library causing test failures

See original GitHub issue

Environment Information

Package version(s):

    "@fluentui-react-native/apple-theme": "^0.7.23",
    "@fluentui-react-native/default-theme": "^0.8.3",
    "@fluentui-react-native/theme": "^0.5.19",
    "@fluentui-react-native/theme-types": "^0.12.1",
    "@fluentui-react-native/win32-theme": "^0.13.2",
    "@fluentui/react-native": "0.25.13",

Platform: all

Please provide a reproduction of the bug:

when running a test

    const theme = createDefaultTheme();

    const tree = renderer
      .create(
        <ThemeProvider theme={theme}>
          <Component>
        </ThemeProvider>,
      )
      .toJSON();
    expect(tree).toMatchSnapshot();

I get this error

    Unhandled discriminated union member: undefined

      at Object.assertNever (../../common/temp/node_modules/.pnpm/assert-never@1.2.1/node_modules/assert-never/index.js:32:11)
      at ../../common/temp/node_modules/.pnpm/@fluentui-react-native/default-theme@0.8.3_d1c53b50ef9cfe887d69c9bf99b2b704/node_modules/@fluentui-react-native/default-theme/src/createDefaultTheme.ts:19:20
      at ThemeReference.get [as theme] (../../common/temp/node_modules/.pnpm/@fluentui-react-native/theme@0.5.19_e6f6aee82b874cf5b3bad5d449c8dc73/node_modules/@fluentui-react-native/theme/src/themeReference.ts:61:66)
      at ../../common/temp/node_modules/.pnpm/@fluentui-react-native/theme@0.5.19_e6f6aee82b874cf5b3bad5d449c8dc73/node_modules/@fluentui-react-native/theme/src/ThemeProvider.tsx:14:9
      at mountState (../../common/temp/node_modules/.pnpm/react-test-renderer@16.13.1_react@16.13.1/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:5971:20)
      at Object.useState (../../common/temp/node_modules/.pnpm/react-test-renderer@16.13.1_react@16.13.1/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:6516:16)
      at Object.useState (../../common/temp/node_modules/.pnpm/react@16.13.1/node_modules/react/cjs/react.development.js:1497:21)
      at Object.<anonymous>.exports.ThemeProvider (../../common/temp/node_modules/.pnpm/@fluentui-react-native/theme@0.5.19_e6f6aee82b874cf5b3bad5d449c8dc73/node_modules/@fluentui-react-native/theme/src/ThemeProvider.tsx:14:9)
      at renderWithHooks (../../common/temp/node_modules/.pnpm/react-test-renderer@16.13.1_react@16.13.1/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:5552:18)
      at mountIndeterminateComponent (../../common/temp/node_modules/.pnpm/react-test-renderer@16.13.1_react@16.13.1/node_modules/react-test-renderer/cjs/react-test-renderer.development.js:7918:13)