public StateStore getStateStore(final String name) throws IllegalArgumentException {
        return getStateStore(name, true);
    }
Get the {@link StateStore} with the given name.
The store can be a "regular" or global store.
<p>
Should be used for custom stores only.
For built-in stores, the corresponding typed methods like {@link #getKeyValueStore(String)} should be used.
<p>
This is often useful in test cases to pre-populate the store before the test case instructs the topology to
{@link TestInputTopic#pipeInput(TestRecord) process an input message}, and/or to check the store afterward.

@param name the name of the store
@return the state store, or {@code null} if no store has been registered with the given name
@throws IllegalArgumentException if the store is a built-in store like {@link KeyValueStore},
{@link WindowStore}, or {@link SessionStore}

@see #getAllStateStores()
@see #getKeyValueStore(String)
@see #getTimestampedKeyValueStore(String)
@see #getVersionedKeyValueStore(String)
@see #getWindowStore(String)
@see #getTimestampedWindowStore(String)
@see #getSessionStore(String)
streams/test-utils/src/main/java/org/apache/kafka/streams/TopologyTestDriver.java