### Question:
AbstractDictionaryModel implements DictionaryModel { @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null || getClass() != obj.getClass()) { return false; } AbstractDictionaryModel other = (AbstractDictionaryModel)obj; if (getFeatureSetting() == null) { if (other.getFeatureSetting() != null) { return false; } } else if (!getFeatureSetting().equals(other.getFeatureSetting())) { return false; } if (getNumUniqTerms() != other.getNumUniqTerms()) { return false; } if (!getDocumentCounts().equals(other.getDocumentCounts())) { return false; } if (!getTermCounts().equals(other.getTermCounts())) { return false; } for (DictionaryEntry thisEntries : this) { CategoryEntries thisCategoryEntries = thisEntries.getCategoryEntries(); CategoryEntries otherEntries = other.getCategoryEntries(thisEntries.getTerm()); if (!thisCategoryEntries.equals(otherEntries)) { return false; } } return true; }  @Override Set<String> getCategories(); @Override void toCsv(PrintStream printStream); @Override int getNumCategories(); @Override int getNumEntries(); @Override int getNumDocuments(); @Override int getNumTerms(); @Override String toString(); @Override int hashCode(); @Override boolean equals(Object obj);  }### Answer:
@Test public void testSerialization() throws IOException { File tempDir = FileHelper.getTempDir(); String tempFile = new File(tempDir, "dictionaryModel.ser").getPath(); FileHelper.serialize(model, tempFile); DictionaryModel deserializedModel = FileHelper.deserialize(tempFile); assertTrue(deserializedModel.equals(model)); }