@Override protected final void configureStorageForTest(StorageComponent.Builder storage) {
    // Defaults are fine.
  }
Base test for {@link SpanStore} implementations that support dependency aggregation. Subtypes
should create a connection to a real backend, even if that backend is in-process.

<p>This is a replacement for {@code zipkin.storage.DependenciesTest}. There is some redundancy
as {@code zipkin2.internal.DependencyLinkerTest} also defines many of these tests. The redundancy
helps ensure integrated storage doesn't fail due to mismapping of data, for example.
zipkin-tests/src/main/java/zipkin2/storage/ITDependencies.java