From 54cb2d268b9eb0c6afa7d30c76995d07563729ec Mon Sep 17 00:00:00 2001
From: n1073645 <n1073645@gmail.com>
Date: Mon, 9 Mar 2020 09:37:34 +0000
Subject: [PATCH] Luhn checksum tests

---
 src/core/operations/LuhnChecksum.mjs    |  6 ++++++
 tests/operations/tests/LuhnChecksum.mjs | 24 +++++++++++++++++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/src/core/operations/LuhnChecksum.mjs b/src/core/operations/LuhnChecksum.mjs
index e6d5fe2b..d9aff649 100644
--- a/src/core/operations/LuhnChecksum.mjs
+++ b/src/core/operations/LuhnChecksum.mjs
@@ -64,9 +64,15 @@ class LuhnChecksum extends Operation {
      * @returns {string}
      */
     run(input, args) {
+
+        if (!(input)) return "0";
+
         const checkSum = this.checksum(input).toString();
+
         let checkDigit = this.checksum(input+"0");
+
         checkDigit =  (checkDigit === 0 ? 0 : (10-checkDigit)).toString();
+
         return "Checksum: " + checkSum + "\n\nCheckdigit: " + checkDigit + "\n\nLuhn Validated String: "+ input + checkDigit;
     }
 
diff --git a/tests/operations/tests/LuhnChecksum.mjs b/tests/operations/tests/LuhnChecksum.mjs
index 28b17854..c5c4c6b7 100644
--- a/tests/operations/tests/LuhnChecksum.mjs
+++ b/tests/operations/tests/LuhnChecksum.mjs
@@ -11,7 +11,29 @@ TestRegister.addTests([
     {
         name: "Luhn Checksum on standard data",
         input: "35641709012469",
-        expectedOutput: "7",
+        expectedOutput: "Checksum: 7\n\nCheckdigit: 0\n\nLuhn Validated String: 356417090124690",
+        recipeConfig: [
+            {
+                op: "Luhn Checksum",
+                args: []
+            },
+        ],
+    },
+    {
+        name: "Luhn Checksum on standard data 2",
+        input: "896101950123440000",
+        expectedOutput: "Checksum: 5\n\nCheckdigit: 1\n\nLuhn Validated String: 8961019501234400001",
+        recipeConfig: [
+            {
+                op: "Luhn Checksum",
+                args: []
+            },
+        ],
+    },
+    {
+        name: "Luhn Checksum on standard data 3",
+        input: "35726908971331",
+        expectedOutput: "Checksum: 6\n\nCheckdigit: 7\n\nLuhn Validated String: 357269089713317",
         recipeConfig: [
             {
                 op: "Luhn Checksum",