From 0a4f44ab15b9bdc6a651affafa14589259efdfd5 Mon Sep 17 00:00:00 2001
From: Gibson Fahnestock <gib@uk.ibm.com>
Date: Mon, 30 Jan 2017 08:26:20 +0000
Subject: [PATCH] luhn: Add more tests

The luhn test suite didn't cover a lot of cases, including:
 - Strings of zeros
 - Non-alphabetic characters
 - Numbers which are only valid if you reverse the string
---
 exercises/luhn/canonical-data.json | 35 ++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/exercises/luhn/canonical-data.json b/exercises/luhn/canonical-data.json
index 0da43846c0..95bd2ffafd 100644
--- a/exercises/luhn/canonical-data.json
+++ b/exercises/luhn/canonical-data.json
@@ -10,6 +10,11 @@
       "input": "0",
       "expected": false
     },
+    {
+      "description": "simple valid sin",
+      "input": " 5 9 ",
+      "expected": true
+    },
     {
       "description": "valid Canadian SIN",
       "input": "046 454 286",
@@ -29,6 +34,36 @@
       "description": "valid strings with a non-digit added become invalid",
       "input": "046a 454 286",
       "expected": false
+    },
+    {
+      "description": "punctuation is not allowed",
+      "input": "055-444-285",
+      "expected": false
+    },
+    {
+      "description": "symbols are not allowed",
+      "input": "055£ 444$ 285",
+      "expected": false
+    },
+    {
+      "description": "single zero with space is invalid",
+      "input": " 0",
+      "expected": false
+    },
+    {
+      "description": "lots of zeros are valid",
+      "input": " 00000",
+      "expected": true
+    },
+    {
+      "description": "another valid sin",
+      "input": "055 444 285",
+      "expected": true
+    },
+    {
+      "description": "nine doubled is nine",
+      "input": "091",
+      "expected": true
     }
   ]
 }