### Question:
MostSimilarGuess { public PrecisionRecallAccumulator getPrecisionRecall(int n, double threshold) { PrecisionRecallAccumulator pr = new PrecisionRecallAccumulator(n, threshold); TIntDoubleMap actual = new TIntDoubleHashMap(); for (KnownSim ks : known.getMostSimilar()) { pr.observe(ks.similarity); actual.put(ks.wpId2, ks.similarity); } for (Observation o : observations) { if (o.rank > n) { break; } pr.observeRetrieved(actual.get(o.id)); } return pr; } MostSimilarGuess(KnownMostSim known, String str);  MostSimilarGuess(KnownMostSim known, SRResultList guess); String toString(); List<Observation> getObservations(); int getLength(); KnownMostSim getKnown(); double getNDGC(); double getPenalizedNDGC(); PrecisionRecallAccumulator getPrecisionRecall(int n, double threshold);  }### Answer:
@Test public void testPrecisionRecall() { PrecisionRecallAccumulator pr = guess.getPrecisionRecall(1, 0.7); assertEquals(pr.getN(), 1); assertEquals(1.0, pr.getPrecision(), 0.001); assertEquals(0.333333, pr.getRecall(), 0.001); pr = guess.getPrecisionRecall(2, 0.7); assertEquals(0.5, pr.getPrecision(), 0.001); assertEquals(0.333333, pr.getRecall(), 0.001); pr = guess.getPrecisionRecall(5, 0.7); assertEquals(0.6666, pr.getPrecision(), 0.001); assertEquals(0.6666, pr.getRecall(), 0.001); }