### Question:
Vector2D { public Vector2D(Vector2D vector2D) { this(vector2D.getXCoordinate(), vector2D.getYCoordinate()); } Vector2D(Vector2D vector2D);  Vector2D(double x, double y); @Override boolean equals(Object o); @Override int hashCode(); double getYCoordinate(); double getXCoordinate(); @Override String toString(); Vector2D getVectorInDirection(double distance, double angle); double getAngleToVector(Vector2D vector2D); double getDistanceToVector(Vector2D vector2D); double getSquaredDistanceToVector(Vector2D vector2D); static final Vector2D ORIGIN; }### Answer:
@Test public void testVector2D() { Vector2D vector2D01 = new Vector2D(5, 7); Assert.assertEquals(7, vector2D01.getYCoordinate(), 0); Assert.assertEquals(5, vector2D01.getXCoordinate(), 0); Vector2D vector2D02 = new Vector2D(vector2D01); Assert.assertEquals(7, vector2D02.getYCoordinate(), 0); Assert.assertEquals(5, vector2D02.getXCoordinate(), 0); Assert.assertEquals(5, vector2D02.getXCoordinate(), 0); Assert.assertEquals(7, vector2D02.getYCoordinate(), 0); }