Add Faker::Blockchain::Aeternity (faker-ruby#1742)

* add aeternity

* update readme

README.md

@@ -211,6 +211,7 @@ gem 'faker', :git => 'https://github.com/faker-ruby/faker.git', :branch => 'mast
   - [Faker::WorldCup](doc/default/world_cup.md)
 
 ### Blockchain
+  - [Faker::Blockchain::Aeternity](doc/blockchain/aeternity.md)
   - [Faker::Blockchain::Bitcoin](doc/blockchain/bitcoin.md)
   - [Faker::Blockchain::Ethereum](doc/blockchain/ethereum.md)
   - [Faker::Blockchain::Tezos](doc/blockchain/tezos.md)

doc/blockchain/aeternity.md

@@ -0,0 +1,12 @@
+# Faker::Blockchain::Aeternity
+
+```ruby
+Faker::Blockchain::Aeternity.address #=> "ak_zvU8YQLagjcfng7Tg8yCdiZ1rpiWNp1PBn3vtUs44utSvbJVR"
+
+Faker::Blockchain::Aeternity.transaction #=> "th_147nDP22h3pHrLt2qykTH4txUwQh1ccaXp"
+
+Faker::Blockchain::Aeternity.contract #=> "ct_Hk2JsNeWGEYQEHHQCfcBeGrwbhtYSwFTPdDhW2SvjFYVojyhW"
+
+Faker::Blockchain::Aeternity.oracle #=> "ok_28QDg7fkF5qiKueSdUvUBtCYPJdmMEoS73CztzXCRAwMGKHKZh"
+
+```

lib/faker/blockchain/aeternity.rb

@@ -0,0 +1,70 @@
+# frozen_string_literal: true
+
+module Faker
+  class Blockchain
+    class Aeternity < Base
+      class << self
+        ##
+        # Produces a random Aeternity wallet address
+        #
+        # @return [String]
+        #
+        # @example
+        #   Faker::Blockchain::Aeternity.address
+        #     #=> "ak_zvU8YQLagjcfng7Tg8yCdiZ1rpiWNp1PBn3vtUs44utSvbJVR"
+        #
+        def address
+          'ak_' + rand_strings
+        end
+
+        ##
+        # Produces a random Aeternity transaction
+        #
+        # @return [String]
+        #
+        # @example
+        #   Faker::Blockchain::Aeternity.transaction
+        #     #=> "th_147nDP22h3pHrLt2qykTH4txUwQh1ccaXp"
+        #
+        def transaction
+          'th_' + rand_strings(51)
+        end
+
+        ##
+        # Produces a random Aeternity contract
+        #
+        # @return [String]
+        #
+        # @example
+        #   Faker::Blockchain::Aeternity.contract
+        #     #=> "ct_Hk2JsNeWGEYQEHHQCfcBeGrwbhtYSwFTPdDhW2SvjFYVojyhW"
+        #
+        def contract
+          'ct_' + rand_strings
+        end
+
+        ##
+        # Produces a random Aeternity oracle
+        #
+        # @return [String]
+        #
+        # @example
+        #   Faker::Blockchain::Aeternity.oracle
+        #     #=> "ok_28QDg7fkF5qiKueSdUvUBtCYPJdmMEoS73CztzXCRAwMGKHKZh"
+        #
+        def oracle
+          'ok_' + rand_strings(51)
+        end
+
+        protected
+
+        def rand_strings(length = 50)
+          hex_alphabet = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
+          var = +''
+          length.times { var << sample(shuffle(hex_alphabet.split(''))) }
+          var
+        end
+      end
+    end
+  end
+end

test/faker/blockchain/aeternity.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require_relative '../../test_helper'
+
+class TestFakerAeternity < Test::Unit::TestCase
+  def setup
+    @tester = Faker::Blockchain::Aeternity
+  end
+
+  def test_address
+    assert_match(/ak_([0-9a-zA-Z]{50}$)/, @tester.address)
+  end
+
+  def test_transaction
+    assert_match(/th_([0-9a-zA-Z]{51}$)/, @tester.transaction)
+  end
+
+  def test_contract
+    assert_match(/ct_([0-9a-zA-Z]{50}$)/, @tester.contract)
+  end
+
+  def test_oracle
+    assert_match(/ok_([0-9a-zA-Z]{51}$)/, @tester.oracle)
+  end
+end