Partition { public int size() { return this.cells.size(); } Partition();  Partition(Partition other);  Partition(int[][] cellData); static Partition unit(int size); @Override boolean equals(Object o); @Override int hashCode(); int size(); int numberOfElements(); boolean isDiscrete(); Permutation toPermutation(); boolean inOrder(); int getFirstInCell(int cellIndex); SortedSet<Integer> getCell(int cellIndex); Partition splitBefore(int cellIndex, int splitElement); Partition splitAfter(int cellIndex, int splitElement); Permutation setAsPermutation(int upTo); boolean isDiscreteCell(int cellIndex); int getIndexOfFirstNonDiscreteCell(); void addSingletonCell(int element); void removeCell(int index); void addCell(int... elements); void addCell(Collection<Integer> elements); void addToCell(int index, int element); void insertCell(int index, SortedSet<Integer> cell); SortedSet<Integer> copyBlock(int cellIndex); void order(); boolean inSameCell(int elementI, int elementJ); @Override String toString(); static Partition fromString(String strForm);  }
@Test public void emptyConstructor() { Partition p = new Partition(); Assert.assertEquals(0, p.size()); }
@Test public void sizeTest() { Partition p = new Partition(); p.addCell(0, 1); p.addCell(2, 3); Assert.assertEquals(2, p.size()); Assert.assertEquals(2, p.getCell(0).size()); Assert.assertEquals(2, p.getCell(1).size()); }