lib: add test helpers for timeouts and sequential test running

lib/Testing.bsv

@@ -0,0 +1,23 @@
+package Testing;
+
+import Assert::*;
+import StmtFSM::*;
+
+module mkTestCycleLimit#(Integer max_cycles)();
+   Reg#(UInt#(64)) c <- mkReg(fromInteger(max_cycles));
+
+   rule count;
+      dynamicAssert(c > 0, "FAIL: test timed out");
+      c <= c-1;
+   endrule
+endmodule
+
+module mkTest#(String name, RStmt#(Bit#(0)) test)();
+   mkAutoFSM(seq
+                $display("RUN ", name);
+                test;
+                $display("OK  ", name);
+             endseq);
+endmodule
+
+endpackage