String baseURLString = "http://localhost/";
CannedDataReader.readCannedData(store, new File("testdata"),
baseURLString);
GraphOverTime got = store.getGraphOverTime(Collections
.singleton((Source) new SourceImpl(baseURLString + "danbri")));
Iterator<Date> previousChanges = got.previousChanges(dateFormat
.parse("20060920123618661"));
assertEquals(dateFormat.parse("20060920123618661"), previousChanges
.next());
assertEquals(dateFormat.parse("19980920123600000"), previousChanges
.next());