cart and checkout

pkg/order/tax_test.go

@@ -0,0 +1,34 @@
+package order
+
+import (
+	"testing"
+)
+
+// TestReExports verifies that the order package's type aliases and
+// forwarders to pkg/cart compile and work correctly.
+func TestReExports(t *testing.T) {
+	// Type alias: TaxProvider = cart.TaxProvider
+	var _ TaxProvider = NewNordicTaxProvider("SE")
+	var _ TaxProvider = NewStaticTaxProvider()
+
+	// NordicTaxProvider
+	p := NewNordicTaxProvider("SE")
+	if p.Name() != "nordic" {
+		t.Errorf("Name = %q", p.Name())
+	}
+	if got := p.DefaultTaxRate("SE"); got != 25 {
+		t.Errorf("DefaultTaxRate(SE) = %d, want 25", got)
+	}
+	if got := ComputeTax(1250, 25); got != 250 {
+		t.Errorf("ComputeTax(1250, 25) = %d, want 250", got)
+	}
+
+	// StaticTaxProvider
+	s := NewStaticTaxProvider()
+	if s.Name() != "static" {
+		t.Errorf("Name = %q", s.Name())
+	}
+	if got := s.DefaultTaxRate("SE"); got != 0 {
+		t.Errorf("DefaultTaxRate(SE) = %d, want 0", got)
+	}
+}