1 files changed, 20 insertions, 0 deletions
diff --git a/luhn/luhn_test.go b/luhn/luhn_test.go
new file mode 100644
index 0000000..ea36119
--- /dev/null
+++ b/luhn/luhn_test.go
@@ -0,0 +1,20 @@
+package luhn
+
+import (
+	"testing"
+
+	"github.com/neonxp/checksum"
+)
+
+func TestLuhn(t *testing.T) {
+	samples := map[string]error{
+		"4561261212345464": checksum.ErrInvalidChecksum,
+		"A561261212345464": checksum.ErrInvalidNumber,
+		"4561261212345467": nil,
+	}
+	for num, result := range samples {
+		if err := Check(num); err != result {
+			t.Errorf("Expected %+v actual %+v", result, err)
+		}
+	}
+}