test(validation): add test suite for json-pointer validation

Author: char0n

src/test/json-pointer.js

@@ -1,6 +1,8 @@
 import parse from '../parse/index.js';
 
 const testJSONPointer = (jsonPointer) => {
+  if (typeof jsonPointer !== 'string') return false;
+
   try {
     const parseResult = parse(jsonPointer);
     return parseResult.result.success;

test/test/json-pointer.js

@@ -0,0 +1,50 @@
+import { assert } from 'chai';
+import { testJSONPointer } from '../../src/index.js';
+
+describe('testJSONPointer', function () {
+  context('valid JSON Pointers', function () {
+    it('should return true for valid JSON Pointers (rfc 6901)', function () {
+      const validPointers = [
+        '', // whole document
+        '/foo', // valid key
+        '/foo/0', // valid array index
+        '/', // empty key (valid but rare)
+        '/a~1b', // escaped `/`
+        '/c%d', // special character
+        '/e^f', // special character
+        '/g|h', // special character
+        '/i\\j', // escape sequence
+        '/k"l', // quotation mark inside key
+        '/ ', // space as key
+        '/m~0n', // escaped `~`
+        '/foo//bar', // valid: double `/` means empty segment
+        '/foo/01', // valid: JSON Pointer allows leading zeroes in path segments
+        '/-', // valid: `-` can be used in array operations
+        '/foo/bar/', // valid: trailing slash is allowed
+        '/foo[0]', // valid: brackets are allowed in keys
+        '/foo?bar', // valid: `?` can be part of a key
+        '/#hashtag', // valid: `#` can be part of a key
+        '/foo bar', // valid: spaces are allowed in keys
+      ];
+
+      validPointers.forEach((pointer) => {
+        assert.isTrue(testJSONPointer(pointer), `failed for pointer: ${pointer}`);
+      });
+    });
+  });
+
+  context('invalid JSON Pointers', function () {
+    it('should return false for malformed JSON Pointers', function () {
+      const invalidPointers = [
+        '/foo/~', // unescaped `~` at the end
+        '/foo/~2bar', // invalid escape `~2`,
+        'foo', // valid relative JSON Pointer
+        'foo/bar', // valid relative JSON Pointer
+      ];
+
+      invalidPointers.forEach((pointer) => {
+        assert.isFalse(testJSONPointer(pointer), `failed for pointer: ${pointer}`);
+      });
+    });
+  });
+});