simple tape js test for redux saga failing with undefined

I've written a few tape tests for my sagas but the most simple examples are consistently failing for the same reason. I have a one line saga:

export function* clearUser(){
    yield* put({type: 'CLEAR_USER'});
}

my tape test is equally simple:

test('clear user saga', (assert)=> {
    const gen = clearUser();
    assert.deepEqual(
        gen.next().value,
        put({type: 'CLEAR_USER'}),
        'clear user should pass to reducer to remove user from state'
    )

    assert.deepEqual(
        gen.next(),
        { done: true, value: undefined },
        'clear user saga should complete'
    )

    assert.end()
});

However, the first assertion fails and says the value is undefined:

  operator: deepEqual
  expected: |-
    { '@@redux-saga/IO': true, PUT: { action: { type: 'CLEAR_USER' }, channel: null } }
  actual: |-
    undefined

I've confirmed I'm importing the saga, and other tests are working, why does this simple test fail?