### Question:
StringIndexKey extends NativeIndexSingleValueKey<StringIndexKey> { @Override void initialize( long entityId ) { super.initialize( entityId ); ignoreLength = false; }  @Override Value asValue(); @Override String toString(); @Override void writeString( String value ); @Override void writeString( char value ); @Override void writeUTF8( byte[] bytes, int offset, int length );  }### Answer:
@Test void minimalSplitterForSameValueShouldDivideLeftAndRight() { StringLayout layout = new StringLayout(); StringIndexKey left = layout.newKey(); StringIndexKey right = layout.newKey(); StringIndexKey minimalSplitter = layout.newKey(); TextValue value = random.randomValues().nextTextValue(); left.initialize( 1 ); right.initialize( 2 ); left.initFromValue( 0, value, NEUTRAL ); right.initFromValue( 0, value, NEUTRAL ); layout.minimalSplitter( left, right, minimalSplitter ); assertTrue( layout.compare( left, minimalSplitter ) < 0, "Expected minimal splitter to be strictly greater than left but wasn't for value " + value ); assertTrue( layout.compare( minimalSplitter, right ) <= 0, "Expected right to be greater than or equal to minimal splitter but wasn't for value " + value ); }
@Test void minimalSplitterShouldRemoveEntityIdIfPossible() { StringLayout layout = new StringLayout(); StringIndexKey left = layout.newKey(); StringIndexKey right = layout.newKey(); StringIndexKey minimalSplitter = layout.newKey(); String string = random.nextString(); TextValue leftValue = Values.stringValue( string ); TextValue rightValue = Values.stringValue( string + random.randomValues().nextCharRaw() ); left.initialize( 1 ); left.initFromValue( 0, leftValue, NEUTRAL ); right.initialize( 2 ); right.initFromValue( 0, rightValue, NEUTRAL ); layout.minimalSplitter( left, right, minimalSplitter ); assertEquals( NO_ENTITY_ID, minimalSplitter.getEntityId(), "Expected minimal splitter to have entityId removed when constructed from keys with unique values: " + "left=" + leftValue + ", right=" + rightValue ); }