A JUnit test for testing Sail implementations that store RDF data. This is
purely a test for data storage and retrieval which assumes that no
inferencing or whatsoever is performed. This is an abstract class that should
be extended for specific Sail implementations.
Gets an instance of the Sail that should be tested. The returned
repository should already have been initialized.
an initialized Sail. throws: SailException - If the initialization of the repository failed.