assertTrue(vector1.similarity(vector2) == 1);
}
@Test
public void testProduct() {
Vector vector1 = new SparseVector();
vector1.add(10, 3);
vector1.add(20, 4);
System.out.println(vector1);
Vector vector2 = new SparseVector();
vector2.add(10, 1);
vector2.add(20, 2);
System.out.println(vector2);
assertTrue(vector1.product(vector2) == 11);
}