includes all date in document age verification

app/models/verification/management/document.rb

@@ -1,5 +1,6 @@
 class Verification::Management::Document
   include ActiveModel::Model
+  include ActiveModel::Dates
 
   attr_accessor :document_type
   attr_accessor :document_number
@@ -31,7 +32,7 @@ class Verification::Management::Document
   end
 
   def under_sixteen?(response)
-    16.years.ago.year < response.date_of_birth.to_date.year
+    16.years.ago < string_to_date(response.date_of_birth)
   end
 
   def verified?

spec/models/verification/management/document_spec.rb

@@ -0,0 +1,37 @@
+require 'rails_helper'
+
+describe Verification::Management::Document do
+  describe "#valid_age?" do
+    it "returns false when the user is younger than sixteen years old" do
+      census_response = double(date_of_birth: "31-12-#{16.years.ago.year}")
+      expect(Verification::Management::Document.new.valid_age?(census_response)).to be false
+    end
+
+    it "returns true when the user is sixteen years old" do
+      census_response = double(date_of_birth: 16.years.ago.strftime("%d-%m-%Y"))
+      expect(Verification::Management::Document.new.valid_age?(census_response)).to be true
+    end
+
+    it "returns true when the user is older than sixteen years old" do
+      census_response = double(date_of_birth: "31-12-#{33.years.ago.year}")
+      expect(Verification::Management::Document.new.valid_age?(census_response)).to be true
+    end
+  end
+
+  describe "#under_sixteen?" do
+    it "returns true when the user is younger than sixteen years old" do
+      census_response = double(date_of_birth: "31-12-#{16.years.ago.year}")
+      expect(Verification::Management::Document.new.under_sixteen?(census_response)).to be true
+    end
+
+    it "returns false when the user is sixteen years old" do
+      census_response = double(date_of_birth: 16.years.ago.strftime("%d-%m-%Y"))
+      expect(Verification::Management::Document.new.under_sixteen?(census_response)).to be false
+    end
+
+    it "returns false when the user is older than sixteen years old" do
+      census_response = double(date_of_birth: "31-12-#{33.years.ago.year}")
+      expect(Verification::Management::Document.new.under_sixteen?(census_response)).to be false
+    end
+  end
+end