Super Dev Mode: fix tests to work better with Google

- Added tests to Google BUILD file.
- Switched to JUnit3 to match the rest of GWT.
- Renamed "tests" to "javatests" for consistency with Google conventions.

Change-Id: Ib969dec7db12e8a3362299ea066a5a11584603d0
Review-Link: https://gwt-review.googlesource.com/#/c/8924/
diff --git a/dev/BUILD b/dev/BUILD
index 64c0709..59e596a 100644
--- a/dev/BUILD
+++ b/dev/BUILD
@@ -362,6 +362,14 @@
     ],
 )
 
+test_suite(
+    name = "alltests",
+    tests = [
+        ":tests",
+        "//third_party/java_src/gwt/svn/trunk/dev/codeserver:tests"
+    ]
+)
+
 GwtTestSuites(
     name = "tests",
     jvm_flags = ["-ea"],