Test and Build commands difference

There is an Arduino (Uno R4 Minima board) project within VSCode that uses outer libraries like Ethernet.h and empty stub for unit testing

Build command platformio.exe run --environment uno_r4_minima compiles depending and my files fine, but test command platformio.exe test fails.

It requires to include SPI.h because it mentioned in .pio\libdeps\uno_r4_minima\Ethernet\src\utility/w5100.h. It is a first weird thing.

Second: after installation missing dependency package test commands fails with errors on standard and third-party libraries

class EthernetServer : public Server {
    using Print::write;
 - 'Server' is not a class or struct name
 - type 'arduino::Print' is not a base type for type 'EthernetServer'


Is there any configuration can change test command behavior? Or maybe I do it completely wrong and some other test approach should be used…

Can you provide a minimal project that reproduces that error?


  1. You are not including your ArduinoProxy.h in the test/test.cpp file, as thus, PlatformIO’s LDF doesn’t resolve its dependencies correctly. This is expected behavior of the LDF.
  2. You misspell Arduino.h as arduino.h in that file too, this will cause build failure on Linux / Mac systems
  3. In your test.cpp you are overwriting the main() function, but this being an on-(embedded)-target unit test, it still needs to be an Arduino sketch with setup() and loop(). See official example instead.

All in all, if you git apply fix.patch with

diff --git a/include/ArduinoProxy.h b/include/ArduinoProxy.h
index b46cefc..46bae70 100644
--- a/include/ArduinoProxy.h
+++ b/include/ArduinoProxy.h
@@ -1,7 +1,7 @@
 #include <Ethernet.h>
 #if defined(ARDUINO) && ARDUINO >= 100
-	#include "arduino.h"
+	#include "Arduino.h"
 	#include "WProgram.h"
@@ -18,4 +18,4 @@ class ArduinoProxy
         IPAddress ip;
         unsigned int localPort = 8888;
         EthernetUDP udp;
\ No newline at end of file
diff --git a/test/test.cpp b/test/test.cpp
index 9366344..6cce09a 100644
--- a/test/test.cpp
+++ b/test/test.cpp
@@ -1,4 +1,6 @@
 #include <unity.h>
+#include <ArduinoProxy.h>
 void setUp(void) {
     // set stuff up here
@@ -8,7 +10,20 @@ void tearDown(void) {
     // clean stuff up here
-int main( int argc, char **argv) {
+void test_calculator_addition(void) {
+    TEST_ASSERT_EQUAL(32, 25 + 7);
+void setup() {
+    // NOTE!!! Wait for >2 secs
+    // if board doesn't support software reset via Serial.DTR/RTS
+    delay(2000);
+    RUN_TEST(test_calculator_addition);
\ No newline at end of file
+void loop() {
+    //Nothing, maybe blink LED

The pio test command will be able to build the firmware correctly.

1 Like

Thanks, it works

One more question: what is PlatformIO’s LDF?



1 Like