Sync isbn-verifier tests (#397)

[no important files changed]

Author: BNAndras

exercises/practice/isbn-verifier/.meta/tests.toml

@@ -30,6 +30,12 @@ description = "invalid character in isbn is not treated as zero"
 [28025280-2c39-4092-9719-f3234b89c627]
 description = "X is only valid as a check digit"
 
+[8005b57f-f194-44ee-88d2-a77ac4142591]
+description = "only one check digit is allowed"
+
+[fdb14c99-4cf8-43c5-b06d-eb1638eff343]
+description = "X is not substituted by the value 10"
+
 [f6294e61-7e79-46b3-977b-f48789a4945b]
 description = "valid isbn without separating dashes"
 

exercises/practice/isbn-verifier/isbn-verifier.spec.coffee

@@ -23,6 +23,12 @@ describe  'ISBN Verifier', ->
   xit 'X is only valid as a check digit', ->
     expect(IsbnVerifier.isValid '3-598-2X507-9').toEqual false
 
+  xit 'only one check digit is allowed', ->
+    expect(IsbnVerifier.isValid '3-598-21508-96').toEqual false
+
+  xit 'X is not substituted by the value 10', ->
+    expect(IsbnVerifier.isValid '3-598-2X507-5').toEqual false
+
   xit 'valid ISBN without separating dashes', ->
     expect(IsbnVerifier.isValid '3598215088').toEqual true