Adds FFaker::Number:leading_zero_number

Changelog.md

@@ -1,6 +1,7 @@
 ## development
 
   - Add your change HERE
+  - Adds FFaker::Number.leading_zero_number [@professor]
   - Update README [@professor]
   - Adds FFaker::Number.between [@professor]
   - Fixed `FFaker::Number.unique.number(digits: 1)` under Ruby 3 [@simonhildebrandt]

lib/ffaker/number.rb

@@ -15,6 +15,10 @@ def decimal(whole_digits: 1, fractional_digits: 1)
       FFaker.numerify("#{whole_part_pattern}.#{fractional_part_pattern}").to_f
     end
 
+    def leading_zero_number(digits: 10)
+      FFaker.numerify("0#{"#" * (digits - 1)}")
+    end
+
     def between(from: 1.00, to: 5000.00)
       fetch_sample(from..to)
     end

test/test_number.rb

@@ -5,7 +5,7 @@
 class TestNumber < Test::Unit::TestCase
   include DeterministicHelper
 
-  assert_methods_are_deterministic(FFaker::Number, :number, :decimal, :between)
+  assert_methods_are_deterministic(FFaker::Number, :number, :decimal, :between, :leading_zero_number)
 
   def setup
     @tester = FFaker::Number
@@ -43,6 +43,14 @@ def test_decimal_when_invalid_argument
     end
   end
 
+  def test_leading_zero
+    assert @tester.leading_zero_number.is_a?(String)
+    assert @tester.leading_zero_number.length == 10
+    assert @tester.leading_zero_number(digits: 3).length == 3
+    assert_match(/\A0\d{9}\z/, @tester.leading_zero_number.to_s)
+    assert_match(/\A0\d{2}\z/, @tester.leading_zero_number(digits: 3).to_s)
+  end
+
   def test_between
     from = -50
     to = 50