The test script should start with "RSpec.describe" or "describe"?

According to Rspec documentation, it is recommended to use the following syntax to write a test script. i.e. the Test script should start with "RSpec.describe":

#example_spec.rb

# 

RSpec.describe EvampleTest do  describe '#Group 1' do
    it 'test 1', :smoke => true do
    end

end

When you run the above example, it throws error uninitialized constant EampleTest (NameError), this happens because the class 'ExampleTest' is not defined. You have create a file with class 'ExampleTest' in lib folder like this
 

#lib/example.rb

class ExmpleTest
end

And include 'exmple.rb' in your script 

#example_spec.rb 

use 'example' 

RSpec.describe EvampleTest do  describe '#Group 1' do
    it 'test 1', :smoke => true do
    end 

end

However This is not mandatory, you can also write Rspec script without creating a dummy class. Just write your script by using "describe" instead of "RSpec.describe" as below

#example_spec.rb

# 

describe "Example Test" do  describe '#Group 1' do
    it 'test 1', :smoke => true do
    end

end