tests/unittests: add tests for libc module

tests/unittests/tests-libc/Makefile

@@ -0,0 +1 @@
+include $(RIOTBASE)/Makefile.base

tests/unittests/tests-libc/tests-libc.c

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+/*
+ * Copyright (C) 2019 ML!PA Consulting GmbH
+ *
+ * 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.
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include "string_utils.h"
+
+#include "tests-libc.h"
+
+static void test_libc_strscpy(void)
+{
+    char buffer[8];
+
+    TEST_ASSERT_EQUAL_INT(strscpy(buffer, "Hello", sizeof(buffer)), 5);
+    TEST_ASSERT_EQUAL_INT(strcmp(buffer, "Hello"), 0);
+    TEST_ASSERT_EQUAL_INT(strscpy(buffer, "012345678", sizeof(buffer)), -E2BIG);
+    TEST_ASSERT_EQUAL_INT(strcmp(buffer, "0123456"), 0);
+    memset(buffer, 0, sizeof(buffer));
+    TEST_ASSERT_EQUAL_INT(strscpy(buffer, "01234567", sizeof(buffer)), -E2BIG);
+    TEST_ASSERT_EQUAL_INT(strcmp(buffer, "0123456"), 0);
+    memset(buffer, 0, sizeof(buffer));
+    TEST_ASSERT_EQUAL_INT(strscpy(buffer, "0123456", sizeof(buffer)), 7);
+    TEST_ASSERT_EQUAL_INT(strcmp(buffer, "0123456"), 0);
+    TEST_ASSERT_EQUAL_INT(strscpy(buffer, "empty", 0), -E2BIG);
+}
+
+Test *tests_libc_tests(void)
+{
+    EMB_UNIT_TESTFIXTURES(fixtures) {
+        new_TestFixture(test_libc_strscpy),
+    };
+
+    EMB_UNIT_TESTCALLER(libc_tests, NULL, NULL, fixtures);
+
+    return (Test *)&libc_tests;
+}
+
+void tests_libc(void)
+{
+    TESTS_RUN(tests_libc_tests());
+}

tests/unittests/tests-libc/tests-libc.h

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+/*
+ * Copyright (C) 2022 ML!PA Consulting GmbH
+ *
+ * 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.
+ */
+
+/**
+ * @addtogroup  unittests
+ * @{
+ *
+ * @file
+ * @brief       Unittests for the ``libc`` module
+ *
+ * @author      Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ */
+#ifndef TESTS_LIBC_H
+#define TESTS_LIBC_H
+
+#include "embUnit.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   The entry point of this test suite.
+ */
+void tests_libc(void);
+
+/**
+ * @brief   Generates tests for libc
+ *
+ * @return  embUnit tests if successful, NULL if not.
+ */
+Test *tests_libc_tests(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* TESTS_LIBC_H */
+/** @} */