diff --git a/test/cctest/test_encoding_binding.cc b/test/cctest/test_encoding_binding.cc
deleted file mode 100644
index d5d14c60fe..0000000000
--- a/test/cctest/test_encoding_binding.cc
+++ /dev/null
@@ -1,176 +0,0 @@
-#include "encoding_binding.h"
-#include "env-inl.h"
-#include "gtest/gtest.h"
-#include "node_test_fixture.h"
-#include "v8.h"
-
-namespace node {
-namespace encoding_binding {
-
-bool RunDecodeLatin1(Environment* env,
-                     Local<Value> args[],
-                     bool ignore_bom,
-                     bool has_fatal,
-                     Local<Value>* result) {
-  Isolate* isolate = env->isolate();
-  TryCatch try_catch(isolate);
-
-  Local<Boolean> ignoreBOMValue = Boolean::New(isolate, ignore_bom);
-  Local<Boolean> fatalValue = Boolean::New(isolate, has_fatal);
-
-  Local<Value> updatedArgs[] = {args[0], ignoreBOMValue, fatalValue};
-
-  BindingData::DecodeLatin1(FunctionCallbackInfo<Value>(updatedArgs));
-
-  if (try_catch.HasCaught()) {
-    return false;
-  }
-
-  *result = args[0];
-  return true;
-}
-
-class EncodingBindingTest : public NodeTestFixture {};
-
-TEST_F(EncodingBindingTest, DecodeLatin1_ValidInput) {
-  Environment* env = CreateEnvironment();
-  Isolate* isolate = env->isolate();
-  HandleScope handle_scope(isolate);
-
-  const uint8_t latin1_data[] = {0xC1, 0xE9, 0xF3};
-  Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, sizeof(latin1_data));
-  memcpy(ab->GetBackingStore()->Data(), latin1_data, sizeof(latin1_data));
-
-  Local<Uint8Array> array = Uint8Array::New(ab, 0, sizeof(latin1_data));
-  Local<Value> args[] = {array};
-
-  Local<Value> result;
-  EXPECT_TRUE(RunDecodeLatin1(env, args, false, false, &result));
-
-  String::Utf8Value utf8_result(isolate, result);
-  EXPECT_STREQ(*utf8_result, "Áéó");
-}
-
-TEST_F(EncodingBindingTest, DecodeLatin1_EmptyInput) {
-  Environment* env = CreateEnvironment();
-  Isolate* isolate = env->isolate();
-  HandleScope handle_scope(isolate);
-
-  Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, 0);
-  Local<Uint8Array> array = Uint8Array::New(ab, 0, 0);
-  Local<Value> args[] = {array};
-
-  Local<Value> result;
-  EXPECT_TRUE(RunDecodeLatin1(env, args, false, false, &result));
-
-  String::Utf8Value utf8_result(isolate, result);
-  EXPECT_STREQ(*utf8_result, "");
-}
-
-TEST_F(EncodingBindingTest, DecodeLatin1_InvalidInput) {
-  Environment* env = CreateEnvironment();
-  Isolate* isolate = env->isolate();
-  HandleScope handle_scope(isolate);
-
-  Local<Value> args[] = {String::NewFromUtf8Literal(isolate, "Invalid input")};
-
-  Local<Value> result;
-  EXPECT_FALSE(RunDecodeLatin1(env, args, false, false, &result));
-}
-
-TEST_F(EncodingBindingTest, DecodeLatin1_IgnoreBOM) {
-  Environment* env = CreateEnvironment();
-  Isolate* isolate = env->isolate();
-  HandleScope handle_scope(isolate);
-
-  const uint8_t latin1_data[] = {0xFE, 0xFF, 0xC1, 0xE9, 0xF3};
-  Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, sizeof(latin1_data));
-  memcpy(ab->GetBackingStore()->Data(), latin1_data, sizeof(latin1_data));
-
-  Local<Uint8Array> array = Uint8Array::New(ab, 0, sizeof(latin1_data));
-  Local<Value> args[] = {array};
-
-  Local<Value> result;
-  EXPECT_TRUE(RunDecodeLatin1(env, args, true, false, &result));
-
-  String::Utf8Value utf8_result(isolate, result);
-  EXPECT_STREQ(*utf8_result, "Áéó");
-}
-
-TEST_F(EncodingBindingTest, DecodeLatin1_FatalInvalidInput) {
-  Environment* env = CreateEnvironment();
-  Isolate* isolate = env->isolate();
-  HandleScope handle_scope(isolate);
-
-  const uint8_t invalid_data[] = {0xFF, 0xFF, 0xFF};
-  Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, sizeof(invalid_data));
-  memcpy(ab->GetBackingStore()->Data(), invalid_data, sizeof(invalid_data));
-
-  Local<Uint8Array> array = Uint8Array::New(ab, 0, sizeof(invalid_data));
-  Local<Value> args[] = {array};
-
-  Local<Value> result;
-  EXPECT_FALSE(RunDecodeLatin1(env, args, false, true, &result));
-}
-
-TEST_F(EncodingBindingTest, DecodeLatin1_IgnoreBOMAndFatal) {
-  Environment* env = CreateEnvironment();
-  Isolate* isolate = env->isolate();
-  HandleScope handle_scope(isolate);
-
-  const uint8_t latin1_data[] = {0xFE, 0xFF, 0xC1, 0xE9, 0xF3};
-  Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, sizeof(latin1_data));
-  memcpy(ab->GetBackingStore()->Data(), latin1_data, sizeof(latin1_data));
-
-  Local<Uint8Array> array = Uint8Array::New(ab, 0, sizeof(latin1_data));
-  Local<Value> args[] = {array};
-
-  Local<Value> result;
-  EXPECT_TRUE(RunDecodeLatin1(env, args, true, true, &result));
-
-  String::Utf8Value utf8_result(isolate, result);
-  EXPECT_STREQ(*utf8_result, "Áéó");
-}
-
-TEST_F(EncodingBindingTest, DecodeLatin1_BOMPresent) {
-  Environment* env = CreateEnvironment();
-  Isolate* isolate = env->isolate();
-  HandleScope handle_scope(isolate);
-
-  const uint8_t latin1_data[] = {0xFF, 0xC1, 0xE9, 0xF3};
-  Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, sizeof(latin1_data));
-  memcpy(ab->GetBackingStore()->Data(), latin1_data, sizeof(latin1_data));
-
-  Local<Uint8Array> array = Uint8Array::New(ab, 0, sizeof(latin1_data));
-  Local<Value> args[] = {array};
-
-  Local<Value> result;
-  EXPECT_TRUE(RunDecodeLatin1(env, args, true, false, &result));
-
-  String::Utf8Value utf8_result(isolate, result);
-  EXPECT_STREQ(*utf8_result, "Áéó");
-}
-
-TEST_F(EncodingBindingTest, DecodeLatin1_ReturnsString) {
-  Environment* env = CreateEnvironment();
-  Isolate* isolate = env->isolate();
-  HandleScope handle_scope(isolate);
-
-  const uint8_t latin1_data[] = {0xC1, 0xE9, 0xF3};
-  Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, sizeof(latin1_data));
-  memcpy(ab->GetBackingStore()->Data(), latin1_data, sizeof(latin1_data));
-
-  Local<Uint8Array> array = Uint8Array::New(ab, 0, sizeof(latin1_data));
-  Local<Value> args[] = {array};
-
-  Local<Value> result;
-  ASSERT_TRUE(RunDecodeLatin1(env, args, false, false, &result));
-
-  ASSERT_TRUE(result->IsString());
-
-  String::Utf8Value utf8_result(isolate, result);
-  EXPECT_STREQ(*utf8_result, "Áéó");
-}
-
-}  // namespace encoding_binding
-}  // namespace node
diff --git a/test/parallel/test-internal-encoding-binding.js b/test/parallel/test-internal-encoding-binding.js
new file mode 100644
index 0000000000..b7483bf1d2
--- /dev/null
+++ b/test/parallel/test-internal-encoding-binding.js
@@ -0,0 +1,48 @@
+// Flags: --expose-internals
+
+'use strict';
+
+require('../common');
+
+const assert = require('node:assert');
+const { internalBinding } = require('internal/test/binding');
+const binding = internalBinding('encoding_binding');
+
+{
+  // Valid input
+  const buf = Uint8Array.from([0xC1, 0xE9, 0xF3]);
+  assert.strictEqual(binding.decodeLatin1(buf, false, false), 'Áéó');
+}
+
+{
+  // Empty input
+  const buf = Uint8Array.from([]);
+  assert.strictEqual(binding.decodeLatin1(buf, false, false), '');
+}
+
+{
+  // Invalid input, but Latin1 has no invalid chars and should never throw.
+  const buf = new TextEncoder().encode('Invalid Latin1 🧑‍🧑‍🧒‍🧒');
+  assert.strictEqual(
+    binding.decodeLatin1(buf, false, false),
+    'Invalid Latin1 ð\x9F§\x91â\x80\x8Dð\x9F§\x91â\x80\x8Dð\x9F§\x92â\x80\x8Dð\x9F§\x92'
+  );
+}
+
+{
+  // IgnoreBOM with BOM
+  const buf = Uint8Array.from([0xFE, 0xFF, 0xC1, 0xE9, 0xF3]);
+  assert.strictEqual(binding.decodeLatin1(buf, true, false), 'þÿÁéó');
+}
+
+{
+  // Fatal and InvalidInput, but Latin1 has no invalid chars and should never throw.
+  const buf = Uint8Array.from([0xFF, 0xFF, 0xFF]);
+  assert.strictEqual(binding.decodeLatin1(buf, false, true), 'ÿÿÿ');
+}
+
+{
+  // IgnoreBOM and Fatal, but Latin1 has no invalid chars and should never throw.
+  const buf = Uint8Array.from([0xFE, 0xFF, 0xC1, 0xE9, 0xF3]);
+  assert.strictEqual(binding.decodeLatin1(buf, true, true), 'þÿÁéó');
+}