BlockIDIntToBase64 functions convert an int block ID to a base-64 string and vice versa.

This function generates an entity name by concatenating the passed prefix, the name of the test requesting the entity name, and the minute, second, and nanoseconds of the call.

GetRequiredEnv gets an environment variable by name and returns an error if it is not found.

Some tests require setting service properties.

error thrown by the http client.