### Question:
Line extends AUnboundedLine implements ILine { @Override public ILine toLine() { return this; } private  Line(final IVector2 supportVector, final IVector2 directionVector); static ILine fromPoints(final IVector2 supportPointA, final IVector2 supportPointB); static ILine fromDirection(final IVector2 supportVector, final IVector2 directionVector); @Override ILine copy(); @Override final boolean equals(final Object other); @Override final int hashCode(); @Override Optional<Double> getYIntercept(); @Override Optional<Double> getXValue(final double y); @Override Optional<Double> getYValue(final double x); @Override ILine getOrthogonalLine(); @Override IVector2 closestPointOnLine(final IVector2 point); @Override ILine toLine(); @Override Optional<IVector2> intersectLine(final ILine other); @Override Optional<IVector2> intersectHalfLine(final IHalfLine halfLine); @Override Optional<IVector2> intersectSegment(final ILineSegment segment); @Override String toString();  }### Answer:
@Test public void testToLine() { IVector2 sV = Vector2.fromXY(4, 2); IVector2 dV = Vector2.fromXY(1, 3); ILine line = Line.fromDirection(sV, dV); ILine copy = line.toLine(); assertThat(line.supportVector(), is(copy.supportVector())); assertThat(line.directionVector(), is(copy.directionVector())); }