test: add purchase price rangeimport service tests

spec/fixtures/files/purchase_price_ranges.csv

@@ -0,0 +1,5 @@
+la_name,la,bedrooms,soft_min,soft_max
+Adur,E07000223,1,105000,369000
+Adur,E07000223,2,177000,384000
+Adur,E07000223,3,246000,539000
+Adur,E07000223,4,310000,860000

spec/lib/tasks/purchase_price_range_import_spec.rb

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+require "rails_helper"
+require "rake"
+
+RSpec.describe "data_import" do
+  describe ":purchase_price_ranges", type: :task do
+    subject(:task) { Rake::Task["data_import:purchase_price_ranges"] }
+
+    before do
+      Rake.application.rake_require("tasks/purchase_price_ranges")
+      Rake::Task.define_task(:environment)
+      task.reenable
+    end
+
+    context "when the rake task is run" do
+      let(:start_year) { 2022 }
+      let(:purchase_price_ranges_file_path) { "./spec/fixtures/files/purchase_price_ranges.csv" }
+      let(:wrong_file_path) { "/test/no_csv_here.csv" }
+
+      it "creates new rent range records" do
+        expect { task.invoke(start_year, purchase_price_ranges_file_path) }.to change(LaPurchasePriceRange, :count).by(4)
+        expect(LaPurchasePriceRange.where(bedrooms: 1).exists?).to be true
+      end
+
+      it "raises an error when no path is given" do
+        expect { task.invoke(start_year, nil) }.to raise_error(RuntimeError, "Usage: rake data_import:purchase_price_ranges[start_year,'path/to/csv_file']")
+      end
+
+      it "raises an error when no file exists at the given path" do
+        expect { task.invoke(start_year, wrong_file_path) }.to raise_error(Errno::ENOENT)
+      end
+
+      it "asks for a start year if it is not given" do
+        expect { task.invoke(nil, purchase_price_ranges_file_path) }.to raise_error(RuntimeError, "Usage: rake data_import:purchase_price_ranges[start_year,'path/to/csv_file']")
+      end
+
+      context "when a record already exists with a matching index of la, bedrooms and start year" do
+        let!(:purchase_price_range) { LaPurchasePriceRange.create(la: "E07000223", bedrooms: 2, soft_min: 177000, soft_max: 384000, start_year: 2022) }
+
+        it "updates rent ranges if the record is matched on la, bedrooms and start year" do
+          task.invoke(start_year, purchase_price_ranges_file_path)
+          purchase_price_range.reload
+          expect(purchase_price_range.soft_max).to eq(384000)
+        end
+      end
+    end
+  end
+end