Modernize the package's style.

test/iterable_zip_test.dart

Index: test/iterable_zip_test.dart
diff --git a/test/iterable_zip_test.dart b/test/iterable_zip_test.dart
index cc8ac76f03685d3b307add6266dc0c77b14a9fb6..067917176644b988bcb7a425ca2282a365419325 100644
--- a/test/iterable_zip_test.dart
+++ b/test/iterable_zip_test.dart
@@ -3,9 +3,11 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import "dart:collection";
-import "package:collection/iterable_zip.dart";
+
 import "package:test/test.dart";
 
+import "package:collection/collection.dart";
+
 /// Iterable like [base] except that it throws when value equals [errorValue].
 Iterable iterError(Iterable base, int errorValue) {
   return base.map((x) => x == errorValue ? throw "BAD" : x);