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Redux is easy for pure functions (basically action creators that return objects and reducers).

const addTodo = (todo) => ({ type: 'ADD_TODO', todo });
expect(addTodo({ foo: 'bar' })).toEqual({ 
    type: 'ADD_TODO', 
    todo: { foo: 'bar' } 
});

Reducers is the same. Just call the function with a initial state and an action and check the returned object.

When it comes to action creators with thunks, it's a little harder. You can check here:

Your title here

Finally, for React you can use the tools that facebook gives you. I personally like Enzyme.