### Question:
LogAxis extends ValueAxis { @Override public List<ValueTick> refreshTicks(Graphics2D g2, AxisState state, Rectangle2D dataArea, RectangleEdge edge) { List<ValueTick> result = new java.util.ArrayList<ValueTick>(); if (RectangleEdge.isTopOrBottom(edge)) { result = refreshTicksHorizontal(g2, dataArea, edge); } else if (RectangleEdge.isLeftOrRight(edge)) { result = refreshTicksVertical(g2, dataArea, edge); } return result; } LogAxis();  LogAxis(String label); double getBase(); void setBase(double base); double getSmallestValue(); void setSmallestValue(double value); NumberTickUnit getTickUnit(); void setTickUnit(NumberTickUnit unit); void setTickUnit(NumberTickUnit unit, boolean notify,
                            boolean turnOffAutoSelect); NumberFormat getNumberFormatOverride(); void setNumberFormatOverride(NumberFormat formatter); double calculateLog(double value); double calculateValue(double log); @Override double java2DToValue(double java2DValue, Rectangle2D area,
            RectangleEdge edge); @Override double valueToJava2D(double value, Rectangle2D area,
            RectangleEdge edge); @Override void configure(); @Override AxisState draw(Graphics2D g2, double cursor, Rectangle2D plotArea,
            Rectangle2D dataArea, RectangleEdge edge,
            PlotRenderingInfo plotState); @Override List<ValueTick> refreshTicks(Graphics2D g2, AxisState state,
            Rectangle2D dataArea, RectangleEdge edge); double exponentLengthToJava2D(double length, Rectangle2D area,
                                RectangleEdge edge); @Override void zoomRange(double lowerPercent, double upperPercent); @Override void pan(double percent); @Override boolean equals(Object obj); @Override int hashCode(); static TickUnitSource createLogTickUnits(Locale locale);  }### Answer:
@Test public void testrefreshTicksWithZeroTickUnit() { LogAxis axis = new LogAxis(); AxisState state = new AxisState(); BufferedImage image = new BufferedImage(200, 100, BufferedImage.TYPE_INT_ARGB); Graphics2D g2 = image.createGraphics(); Rectangle2D area = new Rectangle2D.Double(0.0, 0.0, 200, 100); axis.refreshTicks(g2, state, area, RectangleEdge.TOP); }