Fix the fail test of java examples

Discovered while discussing #1321

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MOS_MIGRATED_REVID=123946533
diff --git a/examples/java-native/src/test/java/com/example/myproject/BUILD b/examples/java-native/src/test/java/com/example/myproject/BUILD
index f3a262d..c804f9f 100644
--- a/examples/java-native/src/test/java/com/example/myproject/BUILD
+++ b/examples/java-native/src/test/java/com/example/myproject/BUILD
@@ -31,6 +31,7 @@
 java_test(
     name = "fail",
     srcs = ["Fail.java"],
+    test_class = "com.example.myproject.Fail",
     deps = ["//third_party:junit4"],
 )