tests: lib: c_lib: add test suite for remove api

Add test suite for remove of zephyr native libc

Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
Signed-off-by: Karthikeyan Krishnasamy <karthikeyan@linumiz.com>

tests/lib/c_lib/stdio/CMakeLists.txt

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(stdio)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/lib/c_lib/stdio/app.overlay

@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2024 Linumiz
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	ramdisk0 {
+		compatible = "zephyr,ram-disk";
+		disk-name = "RAM";
+		sector-size = <512>;
+		sector-count = <160>;
+	};
+};

tests/lib/c_lib/stdio/prj.conf

@@ -0,0 +1,6 @@
+CONFIG_ZTEST=y
+CONFIG_TEST_USERSPACE=y
+CONFIG_ZTEST_FATAL_HOOK=y
+CONFIG_MINIMAL_LIBC=y
+CONFIG_FILE_SYSTEM=y
+CONFIG_FAT_FILESYSTEM_ELM=y

tests/lib/c_lib/stdio/src/main.c

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2024 Linumiz
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <zephyr/kernel.h>
+#include <zephyr/sys/__assert.h>
+#include <zephyr/ztest.h>
+#include <zephyr/ztest_error_hook.h>
+#include <ff.h>
+#include <zephyr/fs/fs.h>
+
+#define FATFS_MNTP	"/RAM:"
+#define TEST_FILE	FATFS_MNTP"/testfile.txt"
+
+static FATFS fat_fs;
+
+static struct fs_mount_t fatfs_mnt = {
+	.type = FS_FATFS,
+	.mnt_point = FATFS_MNTP,
+	.fs_data = &fat_fs,
+};
+
+ZTEST_SUITE(libc_stdio, NULL, NULL, NULL, NULL, NULL);
+
+/**
+ * @brief Test for remove API
+ *
+ * @details Test deletes a file through remove API.
+ */
+ZTEST(libc_stdio, test_remove)
+{
+	struct fs_file_t file;
+
+	fs_file_t_init(&file);
+
+	zassert_ok(fs_mount(&fatfs_mnt), "Error in mount file system\n");
+	zassert_equal(fs_open(&file, TEST_FILE, FS_O_CREATE), 0,
+		      "Error creating file\n");
+	zassert_ok(fs_close(&file), "Error closing file\n");
+	zassert_ok(remove(TEST_FILE), "Error removing file: %d\n", errno);
+	zassert_equal(remove(""), -1, "Error Invalid path removed\n");
+	zassert_equal(remove(NULL), -1, "Error Invalid path removed\n");
+	zassert_ok(fs_unmount(&fatfs_mnt), "Error while unmount file system\n");
+}

tests/lib/c_lib/stdio/testcase.yaml

@@ -0,0 +1,21 @@
+common:
+  tags:
+    - clib
+  min_ram: 128
+  filter: not CONFIG_NATIVE_LIBC
+tests:
+  libraries.libc.common.stdio.minimal:
+    tags: minimal_libc
+    filter: CONFIG_MINIMAL_LIBC_SUPPORTED
+    extra_configs:
+      - CONFIG_MINIMAL_LIBC=y
+  libraries.libc.common.stdio.picolibc:
+    tags: picolibc
+    filter: CONFIG_PICOLIBC_SUPPORTED
+    extra_configs:
+      - CONFIG_PICOLIBC=y
+  libraries.libc.common.stdio.newlib:
+    tags: newlib
+    filter: TOOLCHAIN_HAS_NEWLIB == 1
+    extra_configs:
+      - CONFIG_NEWLIB_LIBC=y