2 files changed, 18 insertions, 13 deletions
diff --git a/test/gleam_json_js_ffi_test.gleam b/test/gleam_json_js_ffi_test.gleam
index cecfe20..b1ddb3b 100644
--- a/test/gleam_json_js_ffi_test.gleam
+++ b/test/gleam_json_js_ffi_test.gleam
@@ -39,7 +39,7 @@ pub fn chromium_unexpected_byte_test() {
   "Unexpected token a in JSON at position 5"
   |> StandardError
   |> get_json_decode_error("{\"b\":a}")
-  |> should.equal(UnexpectedByte(byte: "0x61", position: 5))
+  |> should.equal(UnexpectedByte("0x61"))
 }
 
 @target(javascript)
@@ -47,7 +47,7 @@ pub fn spidermonkey_unexpected_byte_test() {
   "JSON.parse: expected property name or '}' at line 1 column 6 of the JSON data"
   |> StandardError
   |> get_json_decode_error("{\"b\":a}")
-  |> should.equal(UnexpectedByte(byte: "0x61", position: 5))
+  |> should.equal(UnexpectedByte("0x61"))
 }
 
 @target(javascript)
@@ -55,7 +55,7 @@ pub fn javascript_core_unexpected_byte_test() {
   "JSON Parse error: Unexpected identifier \"a\""
   |> StandardError
   |> get_json_decode_error("{\"b\":a}")
-  |> should.equal(UnexpectedByte(byte: "0x61", position: 0))
+  |> should.equal(UnexpectedByte("0x61"))
 }
 
 @target(javascript)
@@ -63,12 +63,12 @@ pub fn spidermonkey_multiline_unexpected_byte_test() {
   "JSON.parse: expected property name or '}' at line 2 column 6 of the JSON data"
   |> StandardError
   |> get_json_decode_error("{\n\"b\": a\n}")
-  |> should.equal(UnexpectedByte(byte: "0x61", position: 7))
+  |> should.equal(UnexpectedByte("0x61"))
 
   "JSON.parse: expected double-quoted property name at line 3 column 1 of the JSON data"
   |> StandardError
   |> get_json_decode_error("{\n\"b\": \"x\",\na\n}")
-  |> should.equal(UnexpectedByte(byte: "0x61", position: 12))
+  |> should.equal(UnexpectedByte("0x61"))
 }
 
 @target(javascript)
diff --git a/test/gleam_json_test.gleam b/test/gleam_json_test.gleam
index 3e22f00..fcc4a62 100644
--- a/test/gleam_json_test.gleam
+++ b/test/gleam_json_test.gleam
@@ -1,6 +1,7 @@
 import gleam/dynamic
 import gleam/json.{type Json}
 import gleam/option.{None, Some}
+import gleam/string
 import gleam/string_builder
 import gleeunit
 import gleeunit/should
@@ -21,11 +22,8 @@ pub fn decode_empty_test() {
 
 pub fn decode_unexpected_byte_test() {
   let assert Error(error) = json.decode(from: "[}", using: dynamic.int)
-  let assert json.UnexpectedByte(byte, index) = error
+  let assert json.UnexpectedByte(byte) = error
   let assert "0x7D" = byte
-
-  // V8 does not report the position of the unexpected byte any more.
-  let assert True = index == 1 || index == -1
 }
 
 pub fn decode_unexpected_format_test() {
@@ -45,11 +43,8 @@ pub fn decode_bits_empty_test() {
 
 pub fn decode_bits_unexpected_byte_test() {
   let assert Error(error) = json.decode(from: "[}", using: dynamic.int)
-  let assert json.UnexpectedByte(byte, index) = error
+  let assert json.UnexpectedByte(byte) = error
   let assert "0x7D" = byte
-
-  // V8 does not report the position of the unexpected byte any more.
-  let assert True = index == 1 || index == -1
 }
 
 pub fn decode_bits_unexpected_format_test() {
@@ -57,6 +52,16 @@ pub fn decode_bits_unexpected_format_test() {
   |> should.equal(Error(json.UnexpectedFormat([empty_list_decode_error()])))
 }
 
+pub fn decode_unexpected_sequence_test() {
+  let assert Error(error) =
+    json.decode(from: "\"\\uxxxx\"", using: dynamic.float)
+  case error {
+    json.UnexpectedSequence("\\uxxxx") -> Nil
+    json.UnexpectedByte("0x78") -> Nil
+    _ -> panic as { "unexpected error: " <> string.inspect(error) }
+  }
+}
+
 pub fn encode_string_test() {
   json.string("hello")
   |> should_encode("\"hello\"")