Add moduletests for FileSystemStore

Baseline for the tests is similar to the TDBStore.
Differing from TDBStore moduletests, FileSystemStore doesn't include
tests for reserved data or corrupting the blockdevice, as it corrupts
the filesystem also.

UNITTESTS/moduletests/storage/kvstore/FileSystemStore/moduletest.cpp

@@ -0,0 +1,111 @@
+/* Copyright (c) 2020 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "gtest/gtest.h"
+#include "features/storage/blockdevice/HeapBlockDevice.h"
+#include "features/storage/kvstore/filesystemstore/FileSystemStore.h"
+#include "features/storage/filesystem/littlefs/LittleFileSystem.h"
+#include "mbed_error.h"
+#include <stdlib.h>
+
+#define HEAPBLOCK_SIZE (4096)
+
+using namespace mbed;
+
+class FileSystemStoreModuleTest : public testing::Test {
+protected:
+    HeapBlockDevice heap{HEAPBLOCK_SIZE};
+    LittleFileSystem *fs;
+    FileSystemStore *store;
+
+    virtual void SetUp()
+    {
+        fs = new LittleFileSystem("kvstore", &heap);
+        if(fs->mount(&heap) != MBED_SUCCESS) {
+            EXPECT_EQ(fs->reformat(&heap), MBED_SUCCESS);
+        }
+        store = new FileSystemStore(fs);
+        EXPECT_EQ(store->init(), MBED_SUCCESS);
+    }
+
+    virtual void TearDown()
+    {
+        EXPECT_EQ(store->deinit(), MBED_SUCCESS);
+        delete store;
+        EXPECT_EQ(fs->unmount(), MBED_SUCCESS);
+        delete fs;
+    }
+};
+
+TEST_F(FileSystemStoreModuleTest, init)
+{
+    EXPECT_EQ(store->deinit(), MBED_SUCCESS);
+    EXPECT_EQ(store->init(), MBED_SUCCESS);
+    EXPECT_EQ(store->init(), MBED_SUCCESS);
+}
+
+TEST_F(FileSystemStoreModuleTest, set_get)
+{
+    char buf[100];
+    size_t size;
+    EXPECT_EQ(store->set("key", "data", 5, 0), MBED_SUCCESS);
+    EXPECT_EQ(store->get("key", buf, 100, &size), MBED_SUCCESS);
+    EXPECT_EQ(size, 5);
+    EXPECT_STREQ("data", buf);
+}
+
+TEST_F(FileSystemStoreModuleTest, erased_set_get)
+{
+    EXPECT_EQ(store->deinit(), MBED_SUCCESS);
+    EXPECT_EQ(heap.init(), MBED_SUCCESS);
+    EXPECT_EQ(heap.erase(0, heap.size()), MBED_SUCCESS);
+    EXPECT_EQ(heap.deinit(), MBED_SUCCESS);
+    EXPECT_EQ(store->init(), MBED_SUCCESS);
+    char buf[100];
+    size_t size;
+    EXPECT_EQ(store->set("key", "data", 5, 0), MBED_SUCCESS);
+    EXPECT_EQ(store->get("key", buf, 100, &size), MBED_SUCCESS);
+    EXPECT_EQ(size, 5);
+    EXPECT_STREQ("data", buf);
+}
+
+TEST_F(FileSystemStoreModuleTest, set_deinit_init_get)
+{
+    char buf[100];
+    size_t size;
+    for (int i = 0; i < 100; ++i) {
+        EXPECT_EQ(store->set("key", "data", 5, 0), MBED_SUCCESS);
+        EXPECT_EQ(store->deinit(), MBED_SUCCESS);
+        EXPECT_EQ(store->init(), MBED_SUCCESS);
+        EXPECT_EQ(store->get("key", buf, 100, &size), MBED_SUCCESS);
+        EXPECT_EQ(size, 5);
+        EXPECT_STREQ("data", buf);
+        EXPECT_EQ(store->remove("key"), MBED_SUCCESS);
+    }
+}
+
+TEST_F(FileSystemStoreModuleTest, set_multiple_iterate)
+{
+    char buf[100];
+    KVStore::iterator_t iterator;
+    EXPECT_EQ(store->set("primary_key", "data", 5, 0), MBED_SUCCESS);
+    EXPECT_EQ(store->set("primary_second_key", "value", 6, 0), MBED_SUCCESS);
+    EXPECT_EQ(store->iterator_open(&iterator, "primary"), MBED_SUCCESS);
+    EXPECT_EQ(store->iterator_next(iterator, buf, 100), MBED_SUCCESS);
+    EXPECT_EQ(store->iterator_next(iterator, buf, 100), MBED_SUCCESS);
+    EXPECT_EQ(store->iterator_next(iterator, buf, 100), MBED_ERROR_ITEM_NOT_FOUND);
+    EXPECT_EQ(store->iterator_close(iterator), MBED_SUCCESS);
+}

UNITTESTS/moduletests/storage/kvstore/FileSystemStore/unittest.cmake

@@ -0,0 +1,40 @@
+####################
+# UNIT TESTS
+####################
+
+set(unittest-includes ${unittest-includes}
+  .
+  ..
+  ../features/frameworks/mbed-trace/mbed-trace
+)
+
+set(unittest-sources
+  ../features/storage/blockdevice/HeapBlockDevice.cpp
+  ../features/storage/kvstore/filesystemstore/FileSystemStore.cpp
+  ../features/storage/filesystem/littlefs/LittleFileSystem.cpp
+  ../features/storage/filesystem/Dir.cpp
+  ../features/storage/filesystem/File.cpp
+  ../features/storage/filesystem/FileSystem.cpp
+  ../features/frameworks/mbed-trace/source/mbed_trace.c
+  ../features/storage/filesystem/littlefs/littlefs/lfs_util.c
+  ../features/storage/filesystem/littlefs/littlefs/lfs.c
+  ../platform/source/FileBase.cpp
+  ../platform/source/FileSystemHandle.cpp
+  ../platform/source/FileHandle.cpp
+)
+
+set(unittest-test-sources
+  moduletests/storage/kvstore/FileSystemStore/moduletest.cpp
+  stubs/mbed_atomic_stub.c
+  stubs/mbed_assert_stub.cpp
+  stubs/mbed_error.c
+  stubs/kv_config_stub.cpp
+  stubs/mbed_retarget_stub.cpp
+)
+
+set(unittest-test-flags
+  -DMBED_LFS_READ_SIZE=64
+  -DMBED_LFS_PROG_SIZE=64
+  -DMBED_LFS_BLOCK_SIZE=512
+  -DMBED_LFS_LOOKAHEAD=512
+)

UNITTESTS/stubs/kv_config_stub.cpp

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) , Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "features/storage/kvstore/conf/kv_config.h"
+
+const char *get_filesystemstore_folder_path()
+{
+    return "kvstore";
+}

UNITTESTS/stubs/mbed_retarget_stub.cpp

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) , Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "platform/mbed_retarget.h"
+#include "platform/FileHandle.h"
+
+namespace mbed {
+void remove_filehandle(FileHandle *file)
+{
+    (void)file;
+}
+}

UNITTESTS/target_h/platform/mbed_retarget.h

@@ -300,6 +300,49 @@ namespace mbed {
 #define     _IFCHR  0020000 //< character special
 #define     _IFIFO  0010000 //< fifo special
 
+#ifndef S_IFMT
+#define S_IFMT      _IFMT   //< type of file
+#endif
+#ifndef S_IFSOCK
+#define S_IFSOCK    _IFSOCK //< socket
+#endif
+#ifndef S_IFLNK
+#define S_IFLNK     _IFLNK  //< symbolic link
+#endif
+#ifndef S_IFREG
+#define S_IFREG     _IFREG  //< regular
+#endif
+#ifndef S_IFBLK
+#define S_IFBLK     _IFBLK  //< block special
+#endif
+#ifndef S_IFDIR
+#define S_IFDIR     _IFDIR  //< directory
+#endif
+#ifndef S_IFCHR
+#define S_IFCHR     _IFCHR  //< character special
+#endif
+#ifndef S_IFIFO
+#define S_IFIFO     _IFIFO  //< fifo special
+#endif
+
+#ifndef S_IRWXU
+#define S_IRWXU     (S_IRUSR | S_IWUSR | S_IXUSR)
+#define     S_IRUSR 0000400 ///< read permission, owner
+#define     S_IWUSR 0000200 ///< write permission, owner
+#define     S_IXUSR 0000100 ///< execute/search permission, owner
+#endif /* S_IRWXU */
+#ifndef S_IRWXG
+#define S_IRWXG     (S_IRGRP | S_IWGRP | S_IXGRP)
+#define     S_IRGRP 0000040 ///< read permission, group
+#define     S_IWGRP 0000020 ///< write permission, group
+#define     S_IXGRP 0000010 ///< execute/search permission, group
+#endif /* S_IRWXG */
+#ifndef S_IRWXO
+#define S_IRWXO     (S_IROTH | S_IWOTH | S_IXOTH)
+#define     S_IROTH 0000004 ///< read permission, other
+#define     S_IWOTH 0000002 ///< write permission, other
+#define     S_IXOTH 0000001 ///< execute/search permission, other
+#endif /* S_IRWXO */
 
 #define O_RDONLY 0        ///< Open for reading
 #define O_WRONLY 1        ///< Open for writing
@@ -319,6 +362,23 @@ namespace mbed {
 #define STDOUT_FILENO 1
 #define STDERR_FILENO 2
 
+#ifndef _STAT_VER
+struct stat {
+    dev_t     st_dev;     ///< Device ID containing file
+    ino_t     st_ino;     ///< File serial number
+    mode_t    st_mode;    ///< Mode of file
+    nlink_t   st_nlink;   ///< Number of links to file
+
+    uid_t     st_uid;     ///< User ID
+    gid_t     st_gid;     ///< Group ID
+
+    off_t     st_size;    ///< Size of file in bytes
+
+    time_t    st_atime;   ///< Time of last access
+    time_t    st_mtime;   ///< Time of last data modification
+    time_t    st_ctime;   ///< Time of last status change
+};
+#endif
 
 struct statvfs {
     unsigned long  f_bsize;    ///< Filesystem block size