Trying to run test with cmdline args

mscott9437 · July 22, 2023, 12:44am

test {
   const allocator = std.testing.allocator;

   const args = try std.process.argsAlloc(allocator);
   defer std.process.argsFree(allocator, args);

   std.debug.print("Arguments: {s}\n", .{args});
}

test cmd:
zig test args.zig --test-cmd-bin --test-cmd hello

receiving error message:
error: the following test command failed with exit code 3

any help will be appreciated. thank you

squeek502 · July 22, 2023, 7:45am

I believe you’re hitting this panic in test_runner.zig:

github.com

ziglang/zig/blob/6e4fff6ba62ae3e61a948c98fa8fea7e35732cc0/lib/test_runner.zig#L28


      
          
              const args = std.process.argsAlloc(fba.allocator()) catch
                  @panic("unable to parse command line args");
          
              var listen = false;
          
              for (args[1..]) |arg| {
                  if (std.mem.eql(u8, arg, "--listen=-")) {
                      listen = true;
                  } else {
                      @panic("unrecognized command line argument");
                  }
              }
          
              if (listen) {
                  return mainServer() catch @panic("internal test runner failure");
              } else {
                  return mainTerminal();
              }
          }

This is the relevant commit where this panic was added: make the build runner and test runner talk to each other · ziglang/zig@ede5dcf · GitHub

mscott9437 · July 22, 2023, 1:11pm

Yes that’s it. I checked the commit. So I am supposed to use this --listen=- parameter somehow? Or I need to add some panic handler? I’m confused

mscott9437 · July 22, 2023, 10:32pm

Okay… looks like I was able to get this running by using a custom test runner which bypasses the panic. So i copied the default test_runner.zig to my src directory (renaming to test_runner_custom.zig),

changed the line:
@panic(“unrecognized command line argument”);

to:
“listen=false;”

then reran the test as:
zig test args.zig --test-cmd-bin --test-cmd “hello” --test-runner .\test_runner_custom.zig

I guess I am satisfied with this for now, just it seems like i should be able to do something simple like:
zig test args.zig --arg1 hello