Add no-op test

tests/zext_coalescer.cpp

@@ -94,117 +94,23 @@ TEST(ZextCoalescerTests, TestElide) {
   runTest({1, 2}, pre, post, true /* elide */);
 }
 
-// TEST(ZextCoalescerTests, TestMultipleRuns) {
-//   auto pre =
-//       "module test_module (\n"
-//       "    input [7:0] I,\n"
-//       "    output [7:0] O\n"
-//       ");\n"
-//       "assign O = {I[7],I[6],I[5],I[2],I[1],I[0],I[4],I[3]};\n"
-//       "endmodule\n";
-//   auto post =
-//       "module test_module (\n"
-//       "    input [7:0] I,\n"
-//       "    output [7:0] O\n"
-//       ");\n"
-//       "assign O = {I[7:5],I[2:0],I[4:3]};\n"
-//       "endmodule\n";
-//   runTest({3, 4, 0, 1, 2, 5, 6, 7}, pre, post);
-// }
-
-// TEST(ZextCoalescerTests, TestNoRuns) {
-//   auto pre =
-//       "module test_module (\n"
-//       "    input [7:0] I,\n"
-//       "    output [7:0] O\n"
-//       ");\n"
-//       "assign O = {I[7],I[5],I[3],I[1],I[6],I[4],I[2],I[0]};\n"
-//       "endmodule\n";
-//   auto post =
-//       "module test_module (\n"
-//       "    input [7:0] I,\n"
-//       "    output [7:0] O\n"
-//       ");\n"
-//       "assign O = {I[7],I[5],I[3],I[1],I[6],I[4],I[2],I[0]};\n"
-//       "endmodule\n";
-//   // Sequence has no contiguous runs.
-//   runTest({0, 2, 4, 6, 1, 3, 5, 7}, pre, post);
-// }
-
-// TEST(ZextCoalescerTests, ReverseRun) {
-//   auto pre =
-//       "module test_module (\n"
-//       "    input [7:0] I,\n"
-//       "    output [7:0] O\n"
-//       ");\n"
-//       "assign O = {I[4],I[5],I[6],I[7],I[3],I[2],I[1],I[0]};\n"
-//       "endmodule\n";
-//   // ZextCoalescer doesn't coalese reverse runs right now.
-//   auto post =
-//       "module test_module (\n"
-//       "    input [7:0] I,\n"
-//       "    output [7:0] O\n"
-//       ");\n"
-//       "assign O = {I[4],I[5],I[6],I[7],I[3:0]};\n"
-//       "endmodule\n";
-//   runTest({0, 1, 2, 3, 7, 6, 5, 4}, pre, post);
-// }
-
-// TEST(ZextCoalescerTests, MultipleNames) {
-//   auto pre =
-//       "module test_module (\n"
-//       "    input [7:0] I0,\n"
-//       "    input [7:0] I1,\n"
-//       "    output [7:0] O\n"
-//       ");\n"
-//       "assign O = {I0[7],I0[6],I0[5],I0[4],I1[3],I1[2],I1[1],I1[0]};\n"
-//       "endmodule\n";
-//   auto post =
-//       "module test_module (\n"
-//       "    input [7:0] I0,\n"
-//       "    input [7:0] I1,\n"
-//       "    output [7:0] O\n"
-//       ");\n"
-//       "assign O = {I0[7:4],I1[3:0]};\n"
-//       "endmodule\n";
-//   std::vector<std::unique_ptr<vAST::AbstractPort>> ports;
-//   ports.push_back(std::make_unique<vAST::Port>(makeVector("I0", 7, 0),
-//                                                vAST::INPUT,
-//                                                vAST::WIRE));
-//   ports.push_back(std::make_unique<vAST::Port>(makeVector("I1", 7, 0),
-//                                                vAST::INPUT,
-//                                                vAST::WIRE));
-//   ports.push_back(std::make_unique<vAST::Port>(makeVector("O", 7, 0),
-//                                                vAST::OUTPUT,
-//                                                vAST::WIRE));
-//   std::vector<BodyElement> body;
-
-//   std::vector<std::unique_ptr<vAST::Expression>> args = {};
-//   for (int i = 7; i >= 0; i--) {
-//     auto id = i > 3 ? "I0" : "I1";
-//     args.emplace_back(
-//         new vAST::Index(
-//             vAST::make_id(id),
-//             vAST::make_num(std::to_string(i))));
-//   }
-//   std::unique_ptr<vAST::Expression> rhs(new vAST::Concat(std::move(args)));
-
-//   body.push_back(std::make_unique<vAST::ContinuousAssign>(
-//       std::make_unique<vAST::Identifier>("O"), std::move(rhs)));
-
-//   std::unique_ptr<vAST::AbstractModule> module = std::make_unique<vAST::Module>(
-//       "test_module",
-//       std::move(ports),
-//       std::move(body));
-
-//   EXPECT_EQ(module->toString(), pre);
-
-//   // Run ZextCoalescer transformer.
-//   vAST::ZextCoalescer transformer;
-//   module = transformer.visit(std::move(module));
-
-//   EXPECT_EQ(module->toString(), post);
-// }
+TEST(ZextCoalescerTests, TestNoop) {
+  auto pre =
+      "module test_module (\n"
+      "    input [7:0] I,\n"
+      "    output [7:0] O\n"
+      ");\n"
+      "assign O = {I[7:0]};\n"
+      "endmodule\n";
+  auto post =
+      "module test_module (\n"
+      "    input [7:0] I,\n"
+      "    output [7:0] O\n"
+      ");\n"
+      "assign O = {I[7:0]};\n"
+      "endmodule\n";
+  runTest({}, pre, post);
+}
 
 }  // namespace