### Question:
Envelope { public Envelope withSideRatioNotTooSmall( ) { double[] from = Arrays.copyOf( this.min, min.length ); double[] to = Arrays.copyOf( this.max, max.length ); double highestDiff = -Double.MAX_VALUE; double[] diffs = new double[from.length]; for ( int i = 0; i < from.length; i++ ) { diffs[i] = to[i] - from[i]; highestDiff = Math.max( highestDiff, diffs[i] ); } final double mindiff = highestDiff / MAXIMAL_ENVELOPE_SIDE_RATIO; for ( int i = 0; i < from.length; i++ ) { if ( diffs[i] < mindiff ) { to[i] = from[i] + mindiff; } } return new Envelope( from, to ); } Envelope( Envelope e );  Envelope( double[] min, double[] max );  Envelope( double xmin, double xmax, double ymin, double ymax ); Envelope withSideRatioNotTooSmall( ); double[] getMin(); double[] getMax(); double getMin( int dimension ); double getMax( int dimension ); double getMinX(); double getMaxX(); double getMinY(); double getMaxY(); int getDimension(); boolean contains( Envelope other ); boolean covers( Envelope other ); boolean intersects( Envelope other ); void expandToInclude( Envelope other ); @Override boolean equals( Object obj ); @Override int hashCode(); double distance( Envelope other, int dimension ); double distance( Envelope other ); double getWidth(); double getWidth( int dimension ); double[] getWidths( int divisor ); double getArea(); double overlap( Envelope other ); boolean isPoint(); @Override String toString(); Envelope intersection( Envelope other );  }### Answer:
@Test void testWithSideRatioNotTooSmall2D() { double[] from = new double[]{0, 0}; double[] to = new double[]{1, 1}; Envelope envelope = new Envelope( from, to ).withSideRatioNotTooSmall(); double[] expectedFrom = new double[]{0, 0}; double[] expectedTo = new double[]{1, 1}; assertArrayEquals( expectedFrom, envelope.min, 0.0001 ); assertArrayEquals( expectedTo, envelope.max, 0.0001 ); final double bigValue = 100; final double smallValue = 0.000000000000000001; to = new double[]{bigValue, smallValue}; Envelope envelope2 = new Envelope( from, to ).withSideRatioNotTooSmall(); double[] expectedTo2 = new double[]{bigValue, bigValue / Envelope.MAXIMAL_ENVELOPE_SIDE_RATIO}; assertArrayEquals( expectedFrom, envelope2.min, 0.0001 ); assertArrayEquals( expectedTo2, envelope2.max, 0.00001 ); }
@Test void testWithSideRatioNotTooSmall4D() { double[] from = new double[]{0, 0, 0, 0}; double[] to = new double[]{1, 1, 1, 1}; Envelope envelope = new Envelope( from, to ).withSideRatioNotTooSmall(); double[] expectedFrom = new double[]{0, 0, 0, 0}; double[] expectedTo = new double[]{1, 1, 1, 1}; assertArrayEquals( expectedFrom, envelope.min, 0.0001 ); assertArrayEquals( expectedTo, envelope.max, 0.0001 ); final double bigValue = 107; final double smallValue = 0.00000000000000000123; to = new double[]{bigValue, smallValue, 12, smallValue * 0.1}; Envelope envelope2 = new Envelope( from, to ).withSideRatioNotTooSmall(); double[] expectedTo2 = new double[]{bigValue, bigValue / Envelope.MAXIMAL_ENVELOPE_SIDE_RATIO, 12, bigValue / Envelope.MAXIMAL_ENVELOPE_SIDE_RATIO}; assertArrayEquals( expectedFrom, envelope2.min, 0.00001 ); assertArrayEquals( expectedTo2, envelope2.max, 0.00001 ); }