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diff --git a/test/test_postcodes.rb b/test/test_postcodes.rb
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+++ b/test/test_postcodes.rb
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+require 'minitest/autorun'
+require_relative '../lib/norwegian-postcodes'
+
+describe PostCodes::PostCode do
+  before do
+    @postcode = PostCodes::PostCode.new('1234', 'MYTOWN', '1378', 'MY MUNICIPALITY', 'G')
+  end
+
+  it "compares to a postcode" do
+    (@postcode >= '1233').must_equal true
+    (@postcode >= '1234').must_equal true
+    (@postcode >= '1235').must_equal false
+  end
+
+  it "has a county" do
+    @postcode.county.must_equal [13, '(BERGEN)']
+  end
+
+  it "can print it's original form" do
+    @postcode.to_s.must_equal "1234\tMYTOWN\t1378\tMY MUNICIPALITY\tG"
+  end
+end
+
+describe 'PostCodes::county' do
+  it "must give the right county names" do
+    PostCodes.county(1).must_equal('ØSTFOLD')
+    PostCodes.county(2).must_equal('AKERSHUS')
+    PostCodes.county(3).must_equal('OSLO')
+    PostCodes.county(4).must_equal('HEDMARK')
+    PostCodes.county(5).must_equal('OPPLAND')
+    PostCodes.county(6).must_equal('BUSKERUD')
+    PostCodes.county(7).must_equal('VESTFOLD')
+    PostCodes.county(8).must_equal('TELEMARK')
+    PostCodes.county(9).must_equal('AUST-AGDER')
+    PostCodes.county(10).must_equal('VEST-AGDER')
+    PostCodes.county(11).must_equal('ROGALAND')
+    PostCodes.county(12).must_equal('HORDALAND')
+    PostCodes.county(13).must_equal('(BERGEN)')
+    PostCodes.county(14).must_equal('SOGN OG FJORDANE')
+    PostCodes.county(15).must_equal('MØRE OG ROMSDAL')
+    PostCodes.county(16).must_equal('SØR-TRØNDELAG')
+    PostCodes.county(17).must_equal('NORD-TRØNDELAG')
+    PostCodes.county(18).must_equal('NORDLAND')
+    PostCodes.county(19).must_equal('TROMS')
+    PostCodes.county(20).must_equal('FINNMARK')
+    PostCodes.county(21).must_equal('SVALBARD')
+    PostCodes.county(22).must_equal('JAN MAYEN')
+    PostCodes.county(23).must_equal('KONTINENTALSOKKELEN')
+  end
+
+  it "must fail on invalid county codes" do
+    PostCodes.county(0).must_equal nil
+    PostCodes.county(25).must_equal nil
+  end
+end
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