Rename attributes

#623

test/models/invoice_test.rb

@@ -9,15 +9,81 @@ class InvoiceTest < ActiveSupport::TestCase
     assert @invoice.valid?
   end
 
-  def test_calculates_subtotal
-    assert_equal BigDecimal('15'), @invoice.sum_without_vat
+  def test_optional_vat_rate
+    @invoice.vat_rate = nil
+    assert @invoice.valid?
+  end
+
+  def test_vat_rate_validation
+    @invoice.vat_rate = -1
+    assert @invoice.invalid?
+
+    @invoice.vat_rate = 0
+    assert @invoice.valid?
+
+    @invoice.vat_rate = 99.9
+    assert @invoice.valid?
+
+    @invoice.vat_rate = 100
+    assert @invoice.invalid?
+  end
+
+  def test_serializes_and_deserializes_vat_rate
+    invoice = @invoice.dup
+    invoice.invoice_items = @invoice.invoice_items
+    invoice.vat_rate = BigDecimal('25.5')
+    invoice.save!
+    invoice.reload
+    assert_equal BigDecimal('25.5'), invoice.vat_rate
+  end
+
+  def test_vat_rate_defaults_to_effective_vat_rate_of_a_registrar
+    registrar = registrars(:bestnames)
+    invoice = @invoice.dup
+    invoice.vat_rate = nil
+    invoice.buyer = registrar
+    invoice.invoice_items = @invoice.invoice_items
+
+    registrar.stub(:effective_vat_rate, BigDecimal(55)) do
+      invoice.save!
+    end
+
+    assert_equal BigDecimal(55), invoice.vat_rate
+  end
+
+  def test_vat_rate_cannot_be_updated
+    @invoice.vat_rate = BigDecimal(21)
+    @invoice.save!
+    @invoice.reload
+    refute_equal BigDecimal(21), @invoice.vat_rate
   end
 
   def test_calculates_vat_amount
     assert_equal BigDecimal('1.5'), @invoice.vat
   end
 
+  def test_vat_amount_is_zero_when_vat_rate_is_blank
+    @invoice.vat_rate = nil
+    assert_equal 0, @invoice.vat
+  end
+
+  def test_calculates_subtotal
+    line_item = InvoiceItem.new
+    invoice = Invoice.new(invoice_items: [line_item, line_item])
+
+    line_item.stub(:item_sum_without_vat, BigDecimal('2.5')) do
+      assert_equal BigDecimal(5), invoice.subtotal
+    end
+  end
+
   def test_calculates_total
-    assert_equal BigDecimal('16.5'), @invoice.sum
+    line_item = InvoiceItem.new
+    invoice = Invoice.new
+    invoice.vat_rate = 10
+    invoice.invoice_items = [line_item, line_item]
+
+    line_item.stub(:item_sum_without_vat, BigDecimal('2.5')) do
+      assert_equal BigDecimal('5.50'), invoice.total
+    end
   end
 end