Add tests for back_path

spec/models/forms/bulk_upload_lettings/guidance_spec.rb

@@ -0,0 +1,35 @@
+require "rails_helper"
+
+RSpec.describe Forms::BulkUploadLettings::Guidance do
+  include Rails.application.routes.url_helpers
+
+  subject(:bu_guidance) { described_class.new(year:, referrer:) }
+
+  let(:year) { 2024 }
+
+  describe "#back_path" do
+    context "when referrer is prepare-your-file" do
+      let(:referrer) { "prepare-your-file" }
+
+      it "returns the prepare your file path" do
+        expect(bu_guidance.back_path).to eq bulk_upload_lettings_log_path(id: "prepare-your-file", form: { year: })
+      end
+    end
+
+    context "when referrer is guidance" do
+      let(:referrer) { "guidance" }
+
+      it "returns the main guidance page path" do
+        expect(bu_guidance.back_path).to eq guidance_path
+      end
+    end
+
+    context "when referrer is absent" do
+      let(:referrer) { nil }
+
+      it "returns the main guidance page path" do
+        expect(bu_guidance.back_path).to eq guidance_path
+      end
+    end
+  end
+end

spec/models/forms/bulk_upload_sales/guidance_spec.rb

@@ -0,0 +1,35 @@
+require "rails_helper"
+
+RSpec.describe Forms::BulkUploadSales::Guidance do
+  include Rails.application.routes.url_helpers
+
+  subject(:bu_guidance) { described_class.new(year:, referrer:) }
+
+  let(:year) { 2024 }
+
+  describe "#back_path" do
+    context "when referrer is prepare-your-file" do
+      let(:referrer) { "prepare-your-file" }
+
+      it "returns the prepare your file path" do
+        expect(bu_guidance.back_path).to eq bulk_upload_sales_log_path(id: "prepare-your-file", form: { year: })
+      end
+    end
+
+    context "when referrer is guidance" do
+      let(:referrer) { "guidance" }
+
+      it "returns the main guidance page path" do
+        expect(bu_guidance.back_path).to eq guidance_path
+      end
+    end
+
+    context "when referrer is absent" do
+      let(:referrer) { nil }
+
+      it "returns the main guidance page path" do
+        expect(bu_guidance.back_path).to eq guidance_path
+      end
+    end
+  end
+end