Added opentelemetry test

Author: jerrytfleung

src/Instrumentation/PDO/tests/Unit/OpentelemetryTest.php

@@ -0,0 +1,30 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use OpenTelemetry\Contrib\Instrumentation\PDO\Opentelemetry;
+
+class OpentelemetryTest extends TestCase
+{
+    public function testGetTraceContextValuesReturnsArray()
+    {
+        $result = Opentelemetry::getTraceContextValues();
+        $this->assertIsArray($result);
+    }
+
+    public function testGetServiceNameValuesReturnsArray()
+    {
+        $result = Opentelemetry::getServiceNameValues();
+        $this->assertIsArray($result);
+    }
+
+    public function testGetServiceNameValuesHandlesMissingClass()
+    {
+        // Temporarily ensure the class does not exist
+        if (class_exists('OpenTelemetry\Contrib\Propagation\ServiceName\ServiceNamePropagator')) {
+            $this->markTestSkipped('ServiceNamePropagator class exists, cannot test missing class branch.');
+        }
+        $result = Opentelemetry::getServiceNameValues();
+        $this->assertIsArray($result);
+        $this->assertEmpty($result);
+    }
+}