can't run the users_controller_spec.rb

  describe "GET new" do
    it "assigns a new user as @user" do
      get :new, {}, valid_session
     assigns(:user).should be_a_new(User)
    end
  end

  describe "GET #new" do
    it "assigns a new user as @user" do
      get :new, params: {}, session: valid_session
      expect(assigns(:user)).to be_a_new(User)
    end
  end

  let(:valid_session) {

     skip("I don't know what to put in there!!!!")
  }

require 'rails_helper'

RSpec.describe UsersController, type: :controller do

  # This should return the minimal set of attributes required to create a valid
  # User. As you add validations to User, be sure to
  # adjust the attributes here as well.
  let(:valid_attributes) {{
      first_name:           "Jason",
      last_name:            "Seifer",
      email:                "jason@teamtreehouse.com",
      password:             "password12345",
      password_confirmation: "password12345"
    }}


  let(:invalid_attributes) {
    skip("Add a hash of attributes invalid for your model")
  }

  # This should return the minimal set of values that should be in the session
  # in order to pass any filters (e.g. authentication) defined in
  # UsersController. Be sure to keep this updated too.
  let(:valid_session) {

     skip("I don't know what to put in there!!!!")
  }

  describe "GET #new" do
    it "assigns a new user as @user" do
      get :new, params: {}, session: valid_session
      expect(assigns(:user)).to be_a_new(User)
    end
  end

  describe "GET #edit" do
    it "assigns the requested user as @user" do
      user = User.create! valid_attributes
      get :edit, params: {id: user.to_param}, session: valid_session
      expect(assigns(:user)).to eq(user)
    end
  end

  describe "POST #create" do
    context "with valid params" do
      it "creates a new User" do
        expect {
          post :create, params: {user: valid_attributes}, session: valid_session
        }.to change(User, :count).by(1)
      end

      it "assigns a newly created user as @user" do
        post :create, params: {user: valid_attributes}, session: valid_session
        expect(assigns(:user)).to be_a(User)
        expect(assigns(:user)).to be_persisted
      end

      it "redirects to the created user" do
        post :create, params: {user: valid_attributes}, session: valid_session
        expect(response).to redirect_to(User.last)
      end

      it "sets the session user_id to the created user" do
        post :create, params: {user: valid_attributes}, session: valid_session
        expect(session[:user_id]).to eq(User.find(email: valid_attributes["email"]).id)
      end
    end

    context "with invalid params" do
      it "assigns a newly created but unsaved user as @user" do
        post :create, params: {user: invalid_attributes}, session: valid_session
        expect(assigns(:user)).to be_a_new(User)
      end

      it "re-renders the 'new' template" do
        post :create, params: {user: invalid_attributes}, session: valid_session
        expect(response).to render_template("new")
      end
    end
  end

  describe "PUT #update" do
    context "with valid params" do
      let(:new_attributes) {
        skip("Add a hash of attributes valid for your model")
      }

      it "updates the requested user" do
        user = User.create! valid_attributes
        put :update, params: {id: user.to_param, user: new_attributes}, session: valid_session
        user.reload
        skip("Add assertions for updated state")
      end

      it "assigns the requested user as @user" do
        user = User.create! valid_attributes
        put :update, params: {id: user.to_param, user: valid_attributes}, session: valid_session
        expect(assigns(:user)).to eq(user)
      end

      it "redirects to the user" do
        user = User.create! valid_attributes
        put :update, params: {id: user.to_param, user: valid_attributes}, session: valid_session
        expect(response).to redirect_to(user)
      end
    end

    context "with invalid params" do
      it "assigns the user as @user" do
        user = User.create! valid_attributes
        put :update, params: {id: user.to_param, user: invalid_attributes}, session: valid_session
        expect(assigns(:user)).to eq(user)
      end

      it "re-renders the 'edit' template" do
        user = User.create! valid_attributes
        put :update, params: {id: user.to_param, user: invalid_attributes}, session: valid_session
        expect(response).to render_template("edit")
      end
    end
  end

  describe "DELETE #destroy" do
    it "destroys the requested user" do
      user = User.create! valid_attributes
      expect {
        delete :destroy, params: {id: user.to_param}, session: valid_session
      }.to change(User, :count).by(-1)
    end

    it "redirects to the users list" do
      user = User.create! valid_attributes
      delete :destroy, params: {id: user.to_param}, session: valid_session
      expect(response).to redirect_to(users_url)
    end
  end

end