Make minimal_test open-source only for now.

python/BUILD

@@ -69,6 +69,8 @@ py_extension(
     srcs = ["api_implementation.c"],
 )
 
+# copybara:strip_for_google3_begin
+
 py_test(
     name = "minimal_test",
     srcs = [
@@ -84,8 +86,6 @@ py_test(
     ],
 )
 
-# copybara:strip_for_google3_begin
-
 # Copy the extensions into the location recognized by Python.
 # .abi3.so indicates use of the limited API, and cross-version ABI compatibility.
 EXT_SUFFIX = ".abi3.so"