### Question:
FlexDoubleArray implements Serializable { public double get(int index) { int pos = Utils.binarySearch(indices, index, 0, used); if (pos >= 0) { return data[pos]; } else { return 0; } } FlexDoubleArray();  FlexDoubleArray(int size);  FlexDoubleArray(int size, int nz); int getSize(); int nnz(); double get(int index); void set(int index, double val); MatrixCursor cursor(); double dot(DenseDoubleVector v); double dot(double [] v); void add(double alpha, DenseDoubleVector v); void scale(final double alpha); void dotDiv(final double alpha, double [] x); void dotDiv(final double [] x); void add(FlexDoubleArray x); void addTo(double [] x); void add(final double alpha, FlexDoubleArray x); void add(final int index, final double val); double elementSum(); double dot(FlexDoubleArray x); void compact(); static final int FIRST_ALLOC_SIZE; }### Answer:
@Test public void testGet() { System.out.println("get"); int index = 0; FlexDoubleArray instance = new FlexDoubleArray(); double expResult = 0.0d; double result = instance.get(index); assertEquals(expResult, result, 0.0); }