diff --git a/examples/thread/map.php b/examples/thread/map.php
new file mode 100644
index 00000000000..fc38de69ffd
--- /dev/null
+++ b/examples/thread/map.php
@@ -0,0 +1,18 @@
+<?php
+use Swoole\Thread;
+$args = Thread::getArguments();
+
+if (empty($args)) {
+    $array = [
+        'a' => random_int(1, 999999999999999999),
+        'b' => random_bytes(128),
+        'c' => uniqid(),
+        'd' => time(),
+    ];
+
+    $map = new Thread\Map($array);
+    $thread = new Thread(__FILE__, $map);
+} else {
+    $map = $args[0];
+    var_dump($map->toArray());
+}
diff --git a/tests/swoole_runtime/file_hook/fgets.phpt b/tests/swoole_runtime/file_hook/fgets.phpt
new file mode 100644
index 00000000000..9631b564c1f
--- /dev/null
+++ b/tests/swoole_runtime/file_hook/fgets.phpt
@@ -0,0 +1,28 @@
+--TEST--
+swoole_runtime/file_hook: fgets
+--SKIPIF--
+<?php
+require __DIR__ . '/../../include/skipif.inc';
+?>
+--FILE--
+<?php
+require __DIR__ . '/../../include/bootstrap.php';
+
+$testFn = function () {
+    $fp = fopen(__FILE__, 'r');
+    $lines[] = fgets($fp);
+    fclose($fp);
+    return $lines;
+};
+
+Swoole\Runtime::enableCoroutine(false);
+$lines = $testFn();
+
+Co\run(function () use ($testFn, $lines) {
+    Swoole\Runtime::enableCoroutine();
+    $lines_2 = $testFn();
+    Swoole\Runtime::enableCoroutine(false);
+    Assert::eq($lines, $lines_2);
+});
+?>
+--EXPECT--
diff --git a/tests/swoole_runtime/file_hook/co_fread.phpt b/tests/swoole_runtime/file_hook/fread.phpt
similarity index 93%
rename from tests/swoole_runtime/file_hook/co_fread.phpt
rename to tests/swoole_runtime/file_hook/fread.phpt
index e15062caee6..a8d45b341c5 100644
--- a/tests/swoole_runtime/file_hook/co_fread.phpt
+++ b/tests/swoole_runtime/file_hook/fread.phpt
@@ -13,7 +13,7 @@ Swoole\Runtime::enableCoroutine();
 go(function () {
     $fp = fopen(__FILE__, 'r');
     echo "open\n";
-    $data = Co::fread($fp, 1024);
+    $data = fread($fp, 1024);
     echo "read\n";
     Swoole\Runtime::enableCoroutine(false);
     Assert::assert(!empty($data));
diff --git a/tests/swoole_thread/arraylist.phpt b/tests/swoole_thread/arraylist.phpt
index 2e9cd5967d3..196cb862618 100644
--- a/tests/swoole_thread/arraylist.phpt
+++ b/tests/swoole_thread/arraylist.phpt
@@ -19,6 +19,7 @@ $array = [
 ];
 
 $l = new ArrayList($array);
+Assert::eq(count($l), count($array));
 Assert::eq($l->toArray(), $array);
 
 for ($i = 0; $i < count($array); $i++) {
@@ -31,6 +32,7 @@ $array2 = [
 ];
 $l[] = $array2;
 
+Assert::eq(count($l), 5);
 Assert::eq($l[4]->toArray(), $array2);
 
 try {
diff --git a/tests/swoole_thread/map.phpt b/tests/swoole_thread/map.phpt
index 101bf05f8ae..3f16cf03a07 100644
--- a/tests/swoole_thread/map.phpt
+++ b/tests/swoole_thread/map.phpt
@@ -20,6 +20,7 @@ $array = [
 
 $m = new Map($array);
 Assert::eq($m->toArray(), $array);
+Assert::eq(count($m), count($array));
 
 foreach ($array as $k => $v) {
     Assert::eq($m[$k], $array[$k]);
@@ -30,8 +31,9 @@ $array2 = [
     'hello' => 'world',
 ];
 $m['map'] = $array2;
-
+Assert::eq(count($m), 5);
 Assert::eq($m['map']->toArray(), $array2);
+Assert::eq(count($m['map']), count($array2));
 Assert::eq($m['map']->values(), array_values($array2));
 ?>
 --EXPECTF--