sync isbn-verifier (exercism#281)

Author: keiravillekode

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/run_test.v

@@ -1,6 +1,6 @@
 module main
 
-fn test_a_valid_isbn() {
+fn test_valid_isbn() {
 	assert is_valid('3-598-21508-8')
 }
 
@@ -28,6 +28,14 @@ fn test_x_is_only_valid_as_a_check_digit() {
 	assert !is_valid('3-598-2X507-9')
 }
 
+fn test_only_one_check_digit_is_allowed() {
+	assert !is_valid('3-598-21508-96')
+}
+
+fn test_x_is_not_substituted_by_the_value_10() {
+	assert !is_valid('3-598-2X507-5')
+}
+
 fn test_valid_isbn_without_separating_dashes() {
 	assert is_valid('3598215088')
 }

exercises/practice/line-up/.docs/instructions.md

@@ -5,9 +5,9 @@ Yaʻqūb expects to use numbers from 1 up to 999.
 
 Rules:
 
-- Numbers ending in 1 (except for 11) → `"st"`
-- Numbers ending in 2 (except for 12) → `"nd"`
-- Numbers ending in 3 (except for 13) → `"rd"`
+- Numbers ending in 1 (unless ending in 11) → `"st"`
+- Numbers ending in 2 (unless ending in 12) → `"nd"`
+- Numbers ending in 3 (unless ending in 13) → `"rd"`
 - All other numbers → `"th"`
 
 Examples: