luhn: bring tests up to date (#425)

Author: glennj

exercises/luhn/.meta/version

@@ -1 +1 @@
-1.6.1
+1.7.0

exercises/luhn/luhn_test.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# local version: 1.6.1.0
+# local version: 1.7.0.0
 
 @test "single digit strings can not be valid" {
   #[[ $BATS_RUN_SKIPPED == true  ]] || skip
@@ -51,6 +51,13 @@
   [[ $output == "false" ]]
 }
 
+@test  "invalid long number with an even remainder" {
+  [[ $BATS_RUN_SKIPPED == true  ]] || skip
+  run bash luhn.sh "1 2345 6789 1234 5678 9012"
+  [[ $status -eq 0 ]]
+  [[ $output == "false" ]]
+}
+
 @test "valid number with an even number of digits" {
   [[ $BATS_RUN_SKIPPED == true  ]] || skip
   run bash luhn.sh "095 245 88"