@protonapp/react-native-material-ui/src/styles/__test__/getTheme.test.js

React Native Material Design Components

import getTheme from '../getTheme';

const uiTheme = {
  palette: {
    primaryColor: '#fff',
  },
  actionButton: {
    container: {
      width: 100,
    },
  },
};

describe('getTheme', () => {
  it('objects exist', () => {
    const theme = getTheme(uiTheme);

    expect(!!theme.palette).toBeTruthy();
    expect(!!theme.fontFamily).toBeTruthy();
    expect(!!theme.spacing).toBeTruthy();
    expect(!!theme.typography).toBeTruthy();

    expect(!!theme.actionButton).toBeTruthy();
    expect(!!theme.actionButton.container).toBeTruthy();
    expect(!!theme.listItem).toBeTruthy();
  });
  it('merges properly', () => {
    const theme = getTheme(uiTheme);

    expect(theme.palette.primaryColor).toBe('#fff');
    expect(theme.actionButton.container.width).toBe(100);
  });
});