force file list ordering (#218)

Author: jeromevdl

aws-lambda-java-tests/src/main/java/com/amazonaws/services/lambda/runtime/tests/EventsArgumentsProvider.java

@@ -43,7 +43,7 @@ public Stream<? extends Arguments> provideArguments(ExtensionContext context) th
             if (folderUrl == null) {
                 throw new IllegalArgumentException("Path " + events.folder() + " cannot be found");
             }
-            Stream<Path> files = Files.list(Paths.get(folderUrl.toURI()));
+            Stream<Path> files = Files.list(Paths.get(folderUrl.toURI())).sorted();
             return files
                     .filter(Files::isRegularFile)
                     .map(path -> Arguments.of(EventLoader.loadEvent(path.toString(), events.type())));

aws-lambda-java-tests/src/main/java/com/amazonaws/services/lambda/runtime/tests/HandlerParamsArgumentsProvider.java

@@ -125,6 +125,6 @@ private Stream<Path> listFiles(String folder) throws IOException, URISyntaxExcep
         if (folderUrl == null) {
             throw new IllegalArgumentException("Path " + folder + " cannot be found");
         }
-        return Files.list(Paths.get(folderUrl.toURI()));
+        return Files.list(Paths.get(folderUrl.toURI())).sorted();
     }
 }