### Question:
DecompositionFactory { public static String getDecompositionName(Decomposition<?> decomposition) { if (decomposition == null) { return null; } return INSTANCE_NAMES.get(decomposition.getClass()); } private  DecompositionFactory(); static Decomposition<?> getDecomposition(String decompositionName); static String getDecompositionName(Decomposition<?> decomposition); static final String LU_COMMONS_NAME; static final String QR_COMMONS_NAME; static final String SV_COMMONS_NAME; static final Decomposition<?> LU_COMMONS; static final Decomposition<?> QR_COMMONS; static final Decomposition<?> SV_COMMONS; }### Answer:
@Test public void testNullDecomposition() { DecompositionFactory.getDecompositionName(null); }