tests/drivers/at_unit: fix unit tests on native

tests/drivers/at_unit/test_all_configs.sh

@@ -7,6 +7,7 @@ rcv_eol_2=""
 send_eol=""
 
 run_test() {
+	echo "================================="
 	echo "Running test with:"
 	echo "  URC handling = $handle_urc"
 	echo "  echo         = $echo"
@@ -14,12 +15,12 @@ run_test() {
 	echo "  rcv EOL 1    = $rcv_eol_1"
 	echo "  rcv EOL 2    = $rcv_eol_2"
 
-	make -j --silent BOARD=native "HANDLE_URC=$handle_urc" "ECHO_ON=$echo" "SEND_EOL=\"$send_eol\"" "RECV_EOL_1=\"$rcv_eol_1\"" "RECV_EOL_2=\"$rcv_eol_2\"" tests-at
+	make -j --silent BOARD=native "HANDLE_URC=$handle_urc" "ECHO_ON=$echo" "SEND_EOL=\"$send_eol\"" "RECV_EOL_1=\"$rcv_eol_1\"" "RECV_EOL_2=\"$rcv_eol_2\""
 
 	# take /dev/ttyS0 as serial interface. It is only required s.t. UART
 	# initialization succeeds and it gets turned off right away.
 	set +e
-	if ! ./bin/native/tests_unittests.elf -c /dev/ttyS0 <<< "s\n";
+	if ! ./bin/native/tests_at_unit.elf -c /dev/ttyS0 <<< "s\n";
 	then
 		echo "================================================================================"
 		echo "Test failed! Generating compile-commands.json of the last build configuration..."
@@ -33,11 +34,6 @@ run_test() {
 # set -x
 set -e
 
-SCRIPT=$(readlink -f "$0")
-BASEDIR=$(dirname "$SCRIPT")/../../../unittests
-
-cd "$BASEDIR"
-
 for urc_i in 0 1; do
 	handle_urc=$urc_i
 	for echo_i in 0 1; do

tests/drivers/at_unit/tests-at.c

@@ -50,6 +50,13 @@ at_urc_t urc_short = {
 };
 #endif
 
+#ifdef BOARD_NATIVE
+#define AT_UNIT_UART_DEV 0
+#else
+/* Most non-native boards have stdout mapped to device 0 */
+#define AT_UNIT_UART_DEV 1
+#endif
+
 static void set_up(void)
 {
     at_dev_init_t at_init_params = {
@@ -58,7 +65,7 @@ static void set_up(void)
         .rp_buf_size = sizeof(rp_buf),
         .rx_buf = buf,
         .rx_buf_size = sizeof(buf),
-        .uart = UART_DEV(1),
+        .uart = UART_DEV(AT_UNIT_UART_DEV),
     };
     int res = at_dev_init(&at_dev, &at_init_params);
     /* check the UART initialization return value and respond as needed */