Fix expected result

Author: koppor

src/test/java/org/jabref/logic/importer/fetcher/IsbnFetcherTest.java

@@ -38,7 +38,7 @@ void setUp() {
         bibEntry.setField(StandardField.PUBLISHER, "Addison Wesley");
         bibEntry.setField(StandardField.YEAR, "2018");
         bibEntry.setField(StandardField.AUTHOR, "Bloch, Joshua");
-        bibEntry.setField(StandardField.DATE, "2018-01-11");
+        bibEntry.setField(StandardField.DATE, "2018-01-01");
         bibEntry.setField(new UnknownField("ean"), "9780134685991");
         bibEntry.setField(StandardField.ISBN, "0134685997");
         bibEntry.setField(StandardField.URL, "https://www.ebook.de/de/product/28983211/joshua_bloch_effective_java.html");