Add tests

spec/lib/tasks/dupicate_rent_periods_spec.rb

@@ -0,0 +1,57 @@
+require "rails_helper"
+require "rake"
+
+RSpec.describe "duplicate_rent_periods" do
+  before(:all) do
+    Rake.application.rake_require("tasks/duplicate_rent_periods")
+    Rake::Task.define_task(:environment)
+  end
+
+  describe "find_redundant_rent_periods" do
+    let(:task) { Rake::Task["find_redundant_rent_periods"] }
+
+    before do
+      task.reenable
+    end
+
+    it "logs the correct information about duplicate rent periods" do
+      allow(Rails.logger).to receive(:info)
+      organisation = create(:organisation, rent_periods: (1..11).to_a)
+
+      [2,4,6,11].each do |rent_period|
+        org_rent_period = build(:organisation_rent_period, organisation: organisation)
+        org_rent_period.save(validate: false)
+        org_rent_period.update_column(:rent_period, rent_period)
+      end
+
+      task.invoke
+
+      expect(Rails.logger).to have_received(:info).with(include("Total number of records: 15"))
+      expect(Rails.logger).to have_received(:info).with(include("Number of affected records: 8"))
+      expect(Rails.logger).to have_received(:info).with(include("Number of records to delete: 4"))
+      expect(Rails.logger).to have_received(:info).with(include("Number of records to keep: 4"))
+    end
+  end
+
+  describe "delete_duplicate_rent_periods" do
+    let(:task) { Rake::Task["delete_duplicate_rent_periods"] }
+
+    before do
+      task.reenable
+    end
+
+    it "deletes redundant rent periods" do
+      allow(Rails.logger).to receive(:info)
+      organisation = create(:organisation, rent_periods: (1..11).to_a)
+
+      [2,4,6,11].each do |rent_period|
+        org_rent_period = build(:organisation_rent_period, organisation: organisation)
+        org_rent_period.save(validate: false)
+        org_rent_period.update_column(:rent_period, rent_period)
+      end
+
+      expect { task.invoke }.to change { OrganisationRentPeriod.count }.by(-4)
+      expect(Rails.logger).to have_received(:info).with(include("Number of deleted duplicate records: 4"))
+    end
+  end
+end