### Question:
ZipkinRequestUUIDImpl implements ZipkinRequestUUID { @Override public String toCougarLogString() { return cougarUuid.toCougarLogString(); } ZipkinRequestUUIDImpl(@Nonnull RequestUUID cougarUuid);  ZipkinRequestUUIDImpl(@Nonnull RequestUUID cougarUuid, @Nullable ZipkinDataBuilder zipkinDataBuilder); @Override String getRootUUIDComponent(); @Override String getParentUUIDComponent(); @Override String getLocalUUIDComponent(); @Override @Nonnull RequestUUID getNewSubUUID(); @Override @Nonnull ZipkinData getZipkinData(); @Override boolean isZipkinTracingEnabled(); @Override boolean isZipkinTracingReady(); @Override ZipkinData buildZipkinData(@Nonnull String spanName); @Override String getUUID(); @Override String toCougarLogString(); @Override String toString();  }### Answer:
@Test public void toCougarLogString_ShouldDeferToCougarUUID() { String cougarLogString = "abcde-1234-fghij-5678-klmno"; when(cougarUuid.toCougarLogString()).thenReturn(cougarLogString); victim = new ZipkinRequestUUIDImpl(cougarUuid, null); assertEquals(cougarLogString, victim.toCougarLogString()); }