test-container.js

class TestContainer extends React.Componen{
  render () {
    const {initialState = {}, children} = this.props;
    return (
      <MemoryRouter
        keyLength={0}
      >
        {
          children
        }
    </MemoryRouter>
    )
  }
}

export default TestContainer;

tests-file.js

describe('test', () => {
  test('test route', () => {
    let wrapper = mount(
        <TestContainer>
          <MyComponent />
        </TestContainer>
      );
    
    console.log(wrapper.instance().history) // prints undefined
  });
  
  test('test route', () => {
    let wrapper = mount(
        <MemoryRouter
          keyLength={0}
        >
          <MyComponent />
        </MemoryRouter>
      );
    
    console.log(wrapper.instance().history) // prints history object
  });
})