From 34a9deb3c25d00d91dc06230ec47934ec94bde60 Mon Sep 17 00:00:00 2001
From: Ivan Tymoshenko <ivan@tymoshenko.me>
Date: Fri, 20 Oct 2023 22:35:56 +0200
Subject: [PATCH] fix: always return null if sub schema is not found

---
 index.js                                       |  2 +-
 ...ref-resolver.test.js => get-schema.test.js} | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)
 rename test/{ref-resolver.test.js => get-schema.test.js} (92%)

diff --git a/index.js b/index.js
index c86fe77..f5059c0 100644
--- a/index.js
+++ b/index.js
@@ -257,7 +257,7 @@ function getDataByJSONPointer (data, jsonPointer) {
     }
     current = current[part]
   }
-  return current
+  return current ?? null
 }
 
 module.exports = { RefResolver }
diff --git a/test/ref-resolver.test.js b/test/get-schema.test.js
similarity index 92%
rename from test/ref-resolver.test.js
rename to test/get-schema.test.js
index 6a40100..1ef7920 100644
--- a/test/ref-resolver.test.js
+++ b/test/get-schema.test.js
@@ -196,3 +196,21 @@ test('should not use a root $id if it is an anchor', () => {
   const resolvedSchema3 = refResolver.getSchema(schemaIdArgument, schemaIdProperty)
   assert.equal(resolvedSchema3, schema)
 })
+
+test('should return null if sub schema by json pointer is not found', () => {
+  const refResolver = new RefResolver()
+
+  const schemaId = 'schemaId'
+  const schema = {
+    $id: 'schemaId',
+    type: 'object',
+    properties: {
+      foo: { type: 'string' }
+    }
+  }
+
+  refResolver.addSchema(schema)
+
+  const schemaRefs = refResolver.getSchema(schemaId, '#/missingSchema')
+  assert.equal(schemaRefs, null)
+})