// This file focuses on negative tests. TODO: Add positive tests.
public void testNullable() {
OpEquator eq = OpComparators.SYNTACTIC_IDENTITY;
assertTrue(eq.equalNullable((DocOp) null, null));
assertFalse(eq.equalNullable(null, new DocOpBuffer().finish()));
assertFalse(eq.equalNullable(new DocOpBuffer().finish(), null));
try {
eq.equal(new DocOpBuffer().finish(), null);