diff --git a/src/SPC/builder/BuilderBase.php b/src/SPC/builder/BuilderBase.php
index 531d8ea3..ed7a21a3 100644
--- a/src/SPC/builder/BuilderBase.php
+++ b/src/SPC/builder/BuilderBase.php
@@ -369,8 +369,10 @@ abstract class BuilderBase
 
         foreach ($this->getExts() as $ext) {
             $ext_name = $ext->getDistName();
-            $php .= "echo 'Running micro with {$ext_name} test' . PHP_EOL;\n";
-            $php .= "assert(extension_loaded('{$ext_name}'));\n\n";
+            if (!empty($ext_name)) {
+                $php .= "echo 'Running micro with {$ext_name} test' . PHP_EOL;\n";
+                $php .= "assert(extension_loaded('{$ext_name}'));\n\n";
+            }
         }
         $php .= "echo '[micro-test-end]';\n";
         return $php;
diff --git a/src/SPC/builder/unix/UnixBuilderBase.php b/src/SPC/builder/unix/UnixBuilderBase.php
index b29ebbee..c48c3ef3 100644
--- a/src/SPC/builder/unix/UnixBuilderBase.php
+++ b/src/SPC/builder/unix/UnixBuilderBase.php
@@ -178,12 +178,17 @@ abstract class UnixBuilderBase extends BuilderBase
             file_put_contents(
                 SOURCE_PATH . '/hello.exe',
                 file_get_contents(SOURCE_PATH . '/php-src/sapi/micro/micro.sfx') .
-                '<?php echo "hello";'
+                ($this->getOption('without-micro-ext-test') ? '<?php echo "[micro-test-start][micro-test-end]";' : $this->generateMicroExtTests())
             );
             chmod(SOURCE_PATH . '/hello.exe', 0755);
             [$ret, $output2] = shell()->execWithResult(SOURCE_PATH . '/hello.exe');
-            if ($ret !== 0 || trim($out = implode('', $output2)) !== 'hello') {
-                throw new RuntimeException('micro failed sanity check, ret[' . $ret . '], out[' . ($out ?? 'NULL') . ']');
+            $raw_out = trim(implode('', $output2));
+            $condition[0] = $ret === 0;
+            $condition[1] = str_starts_with($raw_out, '[micro-test-start]') && str_ends_with($raw_out, '[micro-test-end]');
+            foreach ($condition as $k => $v) {
+                if (!$v) {
+                    throw new RuntimeException("micro failed sanity check with condition[{$k}], ret[{$ret}], out[{$raw_out}]");
+                }
             }
         }
     }
diff --git a/src/SPC/builder/windows/WindowsBuilder.php b/src/SPC/builder/windows/WindowsBuilder.php
index 24b54967..6da15b11 100644
--- a/src/SPC/builder/windows/WindowsBuilder.php
+++ b/src/SPC/builder/windows/WindowsBuilder.php
@@ -261,7 +261,7 @@ class WindowsBuilder extends BuilderBase
             file_put_contents(
                 SOURCE_PATH . '\hello.exe',
                 file_get_contents(BUILD_ROOT_PATH . '\bin\micro.sfx') .
-                ($this->getOption('with-micro-ext-test') ? $this->generateMicroExtTests() : '<?php echo "[micro-test-start][micro-test-end]";')
+                ($this->getOption('without-micro-ext-test') ? '<?php echo "[micro-test-start][micro-test-end]";' : $this->generateMicroExtTests())
             );
             chmod(SOURCE_PATH . '\hello.exe', 0755);
             [$ret, $output2] = cmd()->execWithResult(SOURCE_PATH . '\hello.exe');
diff --git a/src/SPC/command/BuildCliCommand.php b/src/SPC/command/BuildCliCommand.php
index 9e90cc4c..fa5e40b6 100644
--- a/src/SPC/command/BuildCliCommand.php
+++ b/src/SPC/command/BuildCliCommand.php
@@ -36,7 +36,7 @@ class BuildCliCommand extends BuildCommand
         $this->addOption('with-suggested-libs', 'L', null, 'Build with suggested libs for selected exts and libs');
         $this->addOption('with-suggested-exts', 'E', null, 'Build with suggested extensions for selected exts');
         $this->addOption('with-added-patch', 'P', InputOption::VALUE_IS_ARRAY | InputOption::VALUE_REQUIRED, 'Inject patch script outside');
-        $this->addOption('with-micro-ext-test', null, null, 'Enable phpmicro with extension test code');
+        $this->addOption('without-micro-ext-test', null, null, 'Disable phpmicro with extension test code');
     }
 
     public function handle(): int