Add test coverage for TaxHelper

spec/helpers/tax_helper_spec.rb

@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe TaxHelper, type: :helper do
+  let(:line_item) { create(:line_item) }
+  let!(:tax_rate) { create(:tax_rate, amount: 0.1) }
+  let!(:tax_rate2) { create(:tax_rate, amount: 0.2, included_in_price: false) }
+  let!(:included_tax_adjustment) {
+    create(:adjustment, originator: tax_rate, adjustable: line_item, state: "closed")
+  }
+  let!(:additional_tax_adjustment) {
+    create(:adjustment, originator: tax_rate2, adjustable: line_item, state: "closed")
+  }
+  let!(:no_tax_adjustment) {
+    create(:adjustment, amount: 0, adjustable: line_item, state: "closed")
+  }
+
+  describe "#display_taxes" do
+    it "displays included tax" do
+      expect(
+        helper.display_taxes(included_tax_adjustment)
+      ).to eq Spree::Money.new(included_tax_adjustment.included_tax_total)
+    end
+
+    it "displays additional tax" do
+      expect(
+        helper.display_taxes(additional_tax_adjustment)
+      ).to eq Spree::Money.new(additional_tax_adjustment.additional_tax_total)
+    end
+
+    it "displays formatted 0.00 amount when amount is zero" do
+      expect(
+        helper.display_taxes(no_tax_adjustment)
+      ).to eq Spree::Money.new(0.00)
+    end
+
+    it "optionally displays nothing when amount is zero" do
+      expect(
+        helper.display_taxes(no_tax_adjustment, display_zero: false)
+      ).to be_nil
+    end
+  end
+
+  describe "#display_total_with_tax" do
+    it "displays total with included tax" do
+      expect(
+        helper.display_total_with_tax(included_tax_adjustment)
+      ).to eq Spree::Money.new(
+        included_tax_adjustment.amount + + included_tax_adjustment.included_tax_total
+      )
+    end
+
+    it "displays total with additional tax" do
+      expect(
+        helper.display_total_with_tax(additional_tax_adjustment)
+      ).to eq Spree::Money.new(
+        additional_tax_adjustment.amount + additional_tax_adjustment.additional_tax_total
+      )
+    end
+  end
+end