tests: add test application for Elk package

tests/pkg_elk/Makefile

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+include ../Makefile.tests_common
+
+USEPKG += elk
+
+include $(RIOTBASE)/Makefile.include

tests/pkg_elk/Makefile.ci

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+BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-leonardo \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
+    atmega328p-xplained-mini \
+    msb-430 \
+    msb-430h \
+    nucleo-f031k6 \
+    nucleo-f042k6 \
+    nucleo-l011k4 \
+    nucleo-l031k6 \
+    samd10-xmini \
+    stk3200 \
+    stm32f030f4-demo \
+    stm32g0316-disco \
+    telosb \
+    z1 \
+    #

tests/pkg_elk/README.md

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+pkg_elk
+=======
+
+This test application shows a basic usage of the Elk tiny javascript engine.

tests/pkg_elk/app.config.test

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+CONFIG_PACKAGE_ELK=y

tests/pkg_elk/main.c

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+/*
+ * Copyright (C) 2013-2021 Cesanta Software Limited
+ * All rights reserved
+ *
+ * This software is dual-licensed: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. For the terms of this
+ * license, see <http://www.gnu.org/licenses/>.
+ *
+ * You are free to use this software under the terms of the GNU General
+ * Public License, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Alternatively, you can license this software under a commercial
+ * license, please contact us at https://cesanta.com/contact.html
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       Test application for the Elk Javascript engine
+ *
+ *              Taken from README at https://github.com/cesanta/elk
+ * @}
+ */
+#include <stdio.h>
+#include "elk.h"
+
+static char mem[256];
+
+/* C function that adds two numbers. Will be called from JS */
+int sum(int a, int b)
+{
+    return a + b;
+}
+
+int main(void)
+{
+    struct js *js = js_create(mem, sizeof(mem));  /* Create JS instance */
+    jsval_t v = js_import(js, (uintptr_t)sum, "iii"); /* Import C function "sum" */
+    js_set(js, js_glob(js), "f", v);              /* Under the name "f" */
+    jsval_t result = js_eval(js, "f(3, 4);", ~0); /* Call "f" */
+    printf("result: %s\n", js_str(js, result));   /* result: 7 */
+    return 0;
+}

tests/pkg_elk/tests/01-run.py

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+#!/usr/bin/env python3
+
+# Copyright (C) 2021 Inria
+#
+# 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.
+
+import sys
+from testrunner import run
+
+
+def testfunc(child):
+    child.expect_exact("result: 7")
+
+
+if __name__ == "__main__":
+    sys.exit(run(testfunc))