add junitgate command; use .so extension for urand always

com.oracle.truffle.r.test.native/urand/Makefile

@@ -34,7 +34,9 @@ include $(NATIVE_PROJECT)/platform.mk
 OBJ = lib
 SRC = src
 C_SOURCES := $(wildcard $(SRC)/*.c)
-C_LIBNAME := lib$(subst $(SRC)/,,$(C_SOURCES:.c=.$(SHARED_EXT)))
+# Since this library is loaded explicitly we keep a consistent
+# extension so that the test script is portable for TestExpectedOutput
+C_LIBNAME := lib$(subst $(SRC)/,,$(C_SOURCES:.c=.so))
 C_OBJECTS := $(subst $(SRC),$(OBJ),$(C_SOURCES:.c=.o))
 C_LIB := $(OBJ)/$(C_LIBNAME)
 

mx.fastr/mx_fastr.py

@@ -243,6 +243,9 @@ def junit_simple(args):
 def junit_default(args):
     return junit(['--tests', _all_unit_tests()] + args)
 
+def junit_gate(args):
+    return junit(['--tests', _gate_unit_tests()] + args)
+
 def _simple_unit_tests():
     return 'com.oracle.truffle.r.test.simple'
 
@@ -363,6 +366,7 @@ def mx_init(suite):
         'junit' : [junit, ['options']],
         'junitsimple' : [junit_simple, ['options']],
         'junitdefault' : [junit_default, ['options']],
+        'junitgate' : [junit_gate, ['options']],
         'unittest' : [unittest, ['options']],
         'rbcheck' : [rbcheck, ['options']],
         'rcmplib' : [rcmplib, ['options']],