ChangeRecords { @Nullable synchronized Status getChangeFor(String filePath) { return records.get(filePath); }  synchronized void add(@NonNull Status status, @NonNull String filePath); synchronized void addAll(@NonNull ChangeRecords changeRecords); static void process(@NonNull File incrementalFile, @NonNull RecordHandler handler);  }
@Test public void testNoChange() { ChangeRecords changeRecords = new ChangeRecords(); assertThat(changeRecords.getChangeFor("foo")).isNull(); }