Add smoke test for sdkVersion() method

Author: dru1x

tests/Unit/ExpoPushConnectorTest.php

@@ -143,6 +143,14 @@ public function custom_retry_configuration_is_used_when_supplied(): void
 
     // SDK Version ----
 
+    #[Test]
+    public function sdk_version_resolves(): void
+    {
+        $connector = new ExpoPushConnector();
+
+        $this->assertNotSame('unknown', $connector->sdkVersion());
+    }
+
     #[Test]
     public function sdk_version_resolves_the_real_installed_version(): void
     {