Add all_tests.dart.
diff --git a/test/all_tests.dart b/test/all_tests.dart
new file mode 100644
index 0000000..a93d00b
--- /dev/null
+++ b/test/all_tests.dart
@@ -0,0 +1,7 @@
+import 'int32_test.dart' as int32_test;
+import 'int64_test.dart' as int64_test;
+
+main() {
+  int32_test.main();
+  int64_test.main();
+}