diff --git a/spec/factories.rb b/spec/factories.rb
index 062c80aa2..e3a6debab 100644
--- a/spec/factories.rb
+++ b/spec/factories.rb
@@ -1,7 +1,11 @@
 FactoryGirl.define do
-  factory :local_census_record do
-    
+  factory :local_census_record, class: 'LocalCensusRecord' do
+    document_number '12345678A'
+    document_type 1
+    date_of_birth Date.new(1970, 1, 31)
+    postal_code '28002'
   end
+
   sequence(:document_number) { |n| "#{n.to_s.rjust(8, '0')}X" }
 
   factory :user do
diff --git a/spec/lib/census_caller_spec.rb b/spec/lib/census_caller_spec.rb
new file mode 100644
index 000000000..00458a74f
--- /dev/null
+++ b/spec/lib/census_caller_spec.rb
@@ -0,0 +1,38 @@
+require 'rails_helper'
+
+describe CensusCaller do
+  let(:api) { described_class.new }
+
+  describe '#call' do
+    it "returns data from local_census_records if census API is not available" do
+      census_api_response = CensusApi::Response.new({:get_habita_datos_response=>{:get_habita_datos_return=>{:datos_habitante=>{}, :datos_vivienda=>{}}}})
+      local_census_response = LocalCensus::Response.new(create(:local_census_record))
+
+      CensusApi.any_instance.stub(:call).and_return(census_api_response)
+      LocalCensus.any_instance.stub(:call).and_return(local_census_response)
+
+      allow(CensusApi).to receive(:call).with(1, "12345678A")
+      allow(LocalCensus).to receive(:call).with(1, "12345678A")
+
+      response = api.call(1, "12345678A")
+
+      expect(response).to eq(local_census_response)
+    end
+
+    it "returns data from census API if it's available and valid" do
+      census_api_response = CensusApi::Response.new({get_habita_datos_response: {get_habita_datos_return: {datos_habitante: {item: {fecha_nacimiento_string: "1-1-1980"}}}}})
+      local_census_response = LocalCensus::Response.new(create(:local_census_record))
+
+      CensusApi.any_instance.stub(:call).and_return(census_api_response)
+      LocalCensus.any_instance.stub(:call).and_return(local_census_response)
+
+      allow(CensusApi).to receive(:call).with(1, "12345678A")
+      allow(LocalCensus).to receive(:call).with(1, "12345678A")
+
+      response = api.call(1, "12345678A")
+
+      expect(response).to eq(census_api_response)
+    end
+  end
+
+end
diff --git a/spec/lib/local_census_spec.rb b/spec/lib/local_census_spec.rb
new file mode 100644
index 000000000..846082247
--- /dev/null
+++ b/spec/lib/local_census_spec.rb
@@ -0,0 +1,55 @@
+require 'rails_helper'
+
+describe LocalCensus do
+  let(:api) { described_class.new }
+
+  describe '#get_document_number_variants' do
+    it "trims and cleans up entry" do
+      expect(api.get_document_number_variants(2, '  1 2@ 34')).to eq(['1234'])
+    end
+
+    it "returns only one try for passports & residence cards" do
+      expect(api.get_document_number_variants(2, '1234')).to eq(['1234'])
+      expect(api.get_document_number_variants(3, '1234')).to eq(['1234'])
+    end
+
+    it 'takes only the last 8 digits for dnis and resicence cards' do
+      expect(api.get_document_number_variants(1, '543212345678')).to eq(['12345678'])
+    end
+
+    it 'tries all the dni variants padding with zeroes' do
+      expect(api.get_document_number_variants(1, '0123456')).to eq(['123456', '0123456', '00123456'])
+      expect(api.get_document_number_variants(1, '00123456')).to eq(['123456', '0123456', '00123456'])
+    end
+
+    it 'adds upper and lowercase letter when the letter is present' do
+      expect(api.get_document_number_variants(1, '1234567A')).to eq(['1234567', '01234567', '1234567a', '1234567A', '01234567a', '01234567A'])
+    end
+  end
+
+  describe '#call' do
+    let(:invalid_body) { create(:local_census_record, postal_code: '') }
+    let(:valid_body) { create(:local_census_record) }
+
+    it "returns the response for the first valid variant" do
+      allow(api).to receive(:get_record).with(1, "00123456").and_return(invalid_body)
+      allow(api).to receive(:get_record).with(1, "123456").and_return(invalid_body)
+      expect(api).to receive(:get_record).with(1, "0123456").and_return(valid_body)
+
+      response = api.call(1, "123456")
+
+      expect(response).to be_valid
+      expect(response.date_of_birth).to eq(Date.new(1970, 1, 31))
+    end
+
+    it "returns the last failed response" do
+      expect(api).to receive(:get_record).with(1, "00123456").and_return(invalid_body)
+      expect(api).to receive(:get_record).with(1, "123456").and_return(invalid_body)
+      expect(api).to receive(:get_record).with(1, "0123456").and_return(invalid_body)
+      response = api.call(1, "123456")
+
+      expect(response).to_not be_valid
+    end
+  end
+
+end
diff --git a/spec/models/local_census_record_spec.rb b/spec/models/local_census_record_spec.rb
deleted file mode 100644
index f30474418..000000000
--- a/spec/models/local_census_record_spec.rb
+++ /dev/null
@@ -1,5 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe LocalCensusRecord, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
-end