diff --git a/test/Concrete/_testingUtils.c b/test/Concrete/_testingUtils.c
index 693a5a09..ef99f908 100644
--- a/test/Concrete/_testingUtils.c
+++ b/test/Concrete/_testingUtils.c
@@ -1,27 +1,28 @@
-// This isn't a real test, just common code for the other ones.
-//
-// RUN: true
+// RUN: %llvmgcc -D_TESTINGUTILS_TEST %s -o %t
+// RUN: %t | FileCheck %s
+
+#include <stdint.h>
 
 int printf(const char *fmt, ...);
 
-void print_int(unsigned long long val);
+void print_int(uint64_t val);
 
 #define TYPED_PRINT(_name_type, _arg_type)  \
     void print_ ## _name_type(_arg_type val) { print_int(val); }
  
-TYPED_PRINT(i1, unsigned char)
-TYPED_PRINT(i8, unsigned char)
-TYPED_PRINT(i16, unsigned short)
-TYPED_PRINT(i32, unsigned int)
-TYPED_PRINT(i64, unsigned long long)
+TYPED_PRINT(i1, uint8_t)
+TYPED_PRINT(i8, uint8_t)
+TYPED_PRINT(i16, uint16_t)
+TYPED_PRINT(i32, uint32_t)
+TYPED_PRINT(i64, uint64_t)
 
 // This is a workaround to hide the "%c" only format string from the compiler --
 // llvm-gcc can optimize this into putchar even at -O0, and the LLVM JIT doesn't
 // recognize putchar() as a valid external function.
 char *char_format_string = "%c";
 
-void print_int(unsigned long long val) {
-    int cur = 1;
+void print_int(uint64_t val) {
+    uint64_t cur = 1;
 
     // effectively do a log (can't call log because it returns floats)
     // do the nasty divide to prevent overflow
@@ -39,3 +40,41 @@ void print_int(unsigned long long val) {
     
     printf(char_format_string, '\n');
 }
+
+
+#ifdef _TESTINGUTILS_TEST
+int main(int argc, char *argv[])
+{
+        print_i64(0xf000000000000064);
+        // CHECK: 17293822569102704740
+        print_i64(0x7000000000000064);
+        // CHECK: 8070450532247928932
+
+        print_i32(0xf0000032);
+        // CHECK: 4026531890
+        print_i32(0x70000032);
+        // CHECK: 1879048242
+
+        print_i16(0xf016);
+        // CHECK: 61462
+        print_i16(0x7016);
+        // CHECK: 28694
+
+
+        print_i8(0xf8);
+        // CHECK: 248
+        print_i8(0x78);
+        // CHECK: 120
+
+        printf("print_i1(0)\n");
+        print_i1(0);
+        // CHECK: i1(0)
+        // CHECK_NEXT: 0
+
+        printf("print_i1(1)\n");
+        print_i1(1);
+        // CHECK: i1(1)
+        // CHECK_NEXT: 1
+
+}
+#endif