foos_controller_test.rb

require 'test_helper'

class FoosControllerTest < ActionDispatch::IntegrationTest
  setup do
    @foo = foos(:one)
  end

  test "should get index" do
    get foos_url
    assert_response :success
  end

  test "should get new" do
    get new_foo_url
    assert_response :success
  end

  test "should create foo" do
    assert_difference('Foo.count') do
      post foos_url, params: { foo: { bar: @foo.bar, baz: @foo.baz } }
    end

    assert_redirected_to foo_url(Foo.last)
  end

  test "should show foo" do
    get foo_url(@foo)
    assert_response :success
  end

  test "should get edit" do
    get edit_foo_url(@foo)
    assert_response :success
  end

  test "should update foo" do
    patch foo_url(@foo), params: { foo: { bar: @foo.bar, baz: @foo.baz } }
    assert_redirected_to foo_url(@foo)
  end

  test "should destroy foo" do
    assert_difference('Foo.count', -1) do
      delete foo_url(@foo)
    end

    assert_redirected_to foos_url
  end
end

foos_system_test.rb

require "application_system_test_case"

class FoosTest < ApplicationSystemTestCase
  setup do
    @foo = foos(:one)
  end

  test "visiting the index" do
    visit foos_url
    assert_selector "h1", text: "Foos"
  end

  test "creating a Foo" do
    visit foos_url
    click_on "New Foo"

    fill_in "Bar", with: @foo.bar
    fill_in "Baz", with: @foo.baz
    click_on "Create Foo"

    assert_text "Foo was successfully created"
    click_on "Back"
  end

  test "updating a Foo" do
    visit foos_url
    click_on "Edit", match: :first

    fill_in "Bar", with: @foo.bar
    fill_in "Baz", with: @foo.baz
    click_on "Update Foo"

    assert_text "Foo was successfully updated"
    click_on "Back"
  end

  test "destroying a Foo" do
    visit foos_url
    page.accept_confirm do
      click_on "Destroy", match: :first
    end

    assert_text "Foo was successfully destroyed"
  end
end