### Question:
Force implements Direction, Updatable { @Override public String toString() { return new StringBuilder(MIN_LENGTH).append(getClass().getSimpleName()) .append(" [fh=") .append(fh) .append(", fv=") .append(fv) .append(", velocity=") .append(velocity) .append(", sensibility=") .append(sensibility) .append("]") .toString(); } Force();  Force(double fh, double fv);  Force(double fh, double fv, double velocity, double sensibility);  Force(Force force); static Force fromVector(double ox, double oy, double x, double y); void zero(); void setVelocity(double velocity); void setSensibility(double sensibility); void addDirection(double extrp, Direction direction); void addDirection(double extrp, double fh, double fv); void setDirection(Direction direction); void setDirection(double fh, double fv); void setDestination(double fh, double fv); void setDirectionMaximum(Direction max); void setDirectionMinimum(Direction min); double getVelocity(); double getSensibility(); boolean isDecreasingHorizontal(); boolean isIncreasingHorizontal(); @Override void update(double extrp); @Override double getDirectionHorizontal(); @Override double getDirectionVertical(); @Override int hashCode(); @Override boolean equals(Object object); @Override String toString();  }### Answer:
@Test void testToString() { final Force force = new Force(1.0, 2.0, 3.0, 4.0); assertEquals("Force [fh=1.0, fv=2.0, velocity=3.0, sensibility=4.0]", force.toString()); }