How to delete an entire array in Ruby and test with RSpec -

i'm new ruby , taking full stack course. 1 of projects building addressbook. have set how add entry addressbook, however, can't seem figure out how delete entry (i make attempt remove_entry method in addressbook class below not having luck). supposed test first rspec, have test fail , write code pass. if didn't include info needed question let me know (rookie here). anyway, here have far:

rspec

context ".remove_entry"     "removes 1 entry address book"       book = addressbook.new       entry = book.add_entry('ada lovelace', '010.012.1815', 'augusta.king@lovelace.com')       book.remove_entry(entry)        expect(entry).to eq nil     end   end 

addressbook class

require_relative "entry.rb"  class addressbook   attr_accessor :entries    def initialize     @entries = []   end    def add_entry(name, phone, email)     index = 0     @entries.each |entry|       if name < entry.name         break       end       index += 1     end      @entries.insert(index, entry.new(name, phone, email))   end    def remove_entry(entry)     @entries.delete(entry)   end end 

entry class

class entry   attr_accessor :name, :phone_number, :email    def initialize(name, phone_number, email)     @name = name     @phone_number = phone_number     @email = email   end    def to_s     "name: #{@name}\nphone number: #{@phone_number}\nemail: #{@email}"   end end 

when testing code rspec receive following error message:

.....f  failures:    1) addressbook.remove_entry removes 1 entry address book      failure/error: expect(entry).to eq nil         expected: nil             got: [#<entry:0x00000101bc82f0 @name="ada lovelace", @phone_number="010.012.1815", @email="augusta.king@lovelace.com">]         (compared using ==)      # ./spec/address_book_spec.rb:49:in `block (3 levels) in <top (required)>'  finished in 0.02075 seconds (files took 0.14221 seconds load) 6 examples, 1 failure  failed examples:  rspec ./spec/address_book_spec.rb:44 # addressbook.remove_entry removes 1 entry address book 

just test book.entries association empty:

expect(book.entries).to be_empty 

as book local variable in test, not false negative result if keep test atomic. best practices on rspec.

edit: can check entry not in set:

expect(book.entries.index(entry)).to be_nil 

or test change of array length with:

expect { book.remove_entry(entry) }.to change{book.entries.count}.by(-1) 

if wonder be_xxx syntax sugar, if object respond xxx?, can use be_xxx in tests (predicate matchers)