### Question:
NumericFeature implements Feature { @Override public String toString() { return Double.toString(value); } private  NumericFeature(double value); static NumericFeature forValue(double value); double getValue(); @Override FeatureType getFeatureType(); @Override String toString(); @Override int hashCode(); @Override boolean equals(Object o);  }### Answer:
@Test public void testToString() { NumericFeature f = NumericFeature.forValue(1.5); assertEquals("1.5", f.toString()); }