private void junit5Before(ExtensionContext extensionContext) throws Exception {
        final Store jdbiStore = extensionContext.getStore(jdbiNamespace);
        final String uniqueId = extensionContext.getUniqueId();

        final String extensionId = jdbiStore.getOrComputeIfAbsent(JDBI_ID_KEY, k -> uniqueId, String.class);

        if (extensionId.equals(uniqueId)) {
            startExtension();
        }
    }
Convenience method to attach an extension (such as a SqlObject) to the shared handle.
testing/src/main/java/org/jdbi/v3/testing/junit5/JdbiExtension.java