[Rails] gem CanCan help

I defined a block in my ability model

    elsif admin.has_role? :manager

      can [:update, :destroy, :lock, :unlock, :reset_passord], Admin do |another_admin|

         another_admin.is? :employee

      end

but it seems not to be taken in account when testing it :  @manager.is?  :manager true,  @employee.is? :employee true

  test "manager_should_be_able_to_reset_employee_password" do

    sign_in  @manager

    ability = BackofficeAbility.new(@manager)

    debugger

    assert ability.can? :reset_password, @employee

looking into the ability instance , I don't see anything related to another_admin.is? :employee condition ...  => @conditions={},

#<CanCan::Rule:0x007fd92aed1718 @match_all=false, @base_behavior=true, 

@actions=[:update, :destroy, :lock, :unlock, :reset_passord], 

@subjects=[Admin(id: integer, email: string, encrypted_password: string, reset_password_token: string, reset_password_sent_at: datetime, remember_created_at: datetime, sign_in_count: integer, current_sign_in_at: datetime, last_sign_in_at: datetime, current_sign_in_ip: string, last_sign_in_ip: string, failed_attempts: integer, unlock_token: string, locked_at: datetime, created_at: datetime, updated_at: datetime)],

@conditions={},

@block=#<Proc:0x007fd92aed1740@/Users/yves/github/local/yoogroop/app/models/backoffice_ability.rb:26>, @expanded_actions=[:update, :edit, :destroy, :lock, :unlock, :reset_passord]>,

what's wrong with my block ?

thanks for help

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