fix tests

Author: Katze719

.devcontainer/devcontainer.json

@@ -16,6 +16,11 @@
     },
     "runArgs": [
         "--network",
-        "host"
+        "host",
+        "--privileged",
+        "--device",
+        "/dev/bus/usb:/dev/bus/usb",
+        "--device=/dev/ttyUSB0:/dev/ttyUSB0",
+        "--group-add=dialout"
     ]
 }

CMakeLists.txt

@@ -78,4 +78,4 @@ add_custom_command(TARGET serial_tests POST_BUILD
     COMMENT "Copy shared library next to test binary")
 
 enable_testing()
-add_test(NAME SerialEchoTest COMMAND serial_tests /dev/ttyACM0)
+add_test(NAME SerialEchoTest COMMAND serial_tests /dev/ttyUSB0)

tests/serial_test.cpp

@@ -32,9 +32,11 @@
 #include <cstring>
 #include <iostream>
 #include <string>
+#include <thread>
+#include <chrono>
 
 int main(int argc, char *argv[]) {
-  const char *port = argc > 1 ? argv[1] : "/dev/ttyACM0"; // default path
+  const char *port = argc > 1 ? argv[1] : "/dev/ttyUSB0"; // default path
   const std::string testMsg = "HELLO";
 
   intptr_t handle = serialOpen((void *)port, 115200, 8, 0, 0);
@@ -43,6 +45,11 @@ int main(int argc, char *argv[]) {
     return 1;
   }
 
+  // Opening a serial connection toggles DTR on most Arduino boards, which
+  // triggers a reset.  Give the micro-controller a moment to reboot before we
+  // start talking to it, otherwise the first bytes might be lost.
+  std::this_thread::sleep_for(std::chrono::seconds(2));
+
   // Send message
   int written =
       serialWrite(handle, (void *)testMsg.c_str(), testMsg.size(), 100, 1);