tests/external_board_dirs: Test app for EXTERNAL_BOARD_DIRS

tests/external_board_dirs/Makefile

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+include ../Makefile.tests_common
+
+# Require arch_native feature so this is not compiled for other boards in
+# $(RIOTBOARD)/
+FEATURES_REQUIRED += arch_native
+
+# Set without '?=' to also verify the docker integration when set with =
+EXTERNAL_BOARD_DIRS = $(CURDIR)/external_board_dir_1
+EXTERNAL_BOARD_DIRS += $(CURDIR)/external_board_dir_2
+
+include $(RIOTBASE)/Makefile.include

tests/external_board_dirs/README.md

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+Test for `EXTERNAL_BOARD_DIRS`
+==============================
+
+This test contains two directories containing external boards, namely
+`external_board_dir_1` and `external_board_dir_2`. Each contains a symlink to
+boards/native (so that this test does not need to maintain boards), the first
+is named `native1` and the second `native2`. The variable `EXTERNAL_BOARD_DIRS`
+is set to contain both directories.
+
+This test succeeds if:
+
+1. `make info-boards-supported` lists `native native1 native2`
+2. Building works for all three boards, e.g. by
+    a) `make BOARD=native`
+    b) `make BOARD=native1`
+    c) `make BOARD=native2`

tests/external_board_dirs/external_board_dir_1/native1

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+../../../boards/native/

tests/external_board_dirs/external_board_dir_2/native2

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+../../../boards/native/

tests/external_board_dirs/main.c

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+/*
+ * Copyright (C) 2014 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     examples
+ * @{
+ *
+ * @file
+ * @brief       Hello World application
+ *
+ * @author      Kaspar Schleiser <kaspar@schleiser.de>
+ * @author      Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+
+int main(void)
+{
+    puts("Hello World!");
+
+    printf("You are running RIOT on a(n) %s board.\n", RIOT_BOARD);
+    printf("This board features a(n) %s MCU.\n", RIOT_MCU);
+
+    return 0;
+}