device tests: some of them can be run on host (#6912)

* device tests: mock scripts + rename some tests to enable mock-testing them

* move symbol

tests/device/test_sw_FS/test_sw_FS.ino

@@ -0,0 +1,147 @@
+#include <ESP8266WiFi.h>
+#include "FS.h"
+#include <BSTest.h>
+
+BS_ENV_DECLARE();
+
+void setup()
+{
+    Serial.begin(115200);
+    BS_RUN(Serial);
+}
+
+bool pretest()
+{
+    return true;
+}
+
+
+TEST_CASE("read-write test","[fs]")
+{
+    REQUIRE(SPIFFS.begin());
+
+    String text = "write test";
+    {
+        File out = SPIFFS.open("/tmp.txt", "w");
+        REQUIRE(out);
+        out.print(text);
+    }
+
+    {
+        File in = SPIFFS.open("/tmp.txt", "r");
+        REQUIRE(in);
+        CHECK(in.size() == text.length());
+        in.setTimeout(0);
+        String result = in.readString();
+        CHECK(result == text);
+    }
+}
+
+TEST_CASE("A bunch of files show up in openDir, and can be removed", "[fs]")
+{
+    REQUIRE(SPIFFS.begin());
+    const int n = 10;
+    int found[n] = {0};
+
+    {
+        Dir root = SPIFFS.openDir("");
+        while (root.next()) {
+            CHECK(SPIFFS.remove(root.fileName()));
+        }
+    }
+
+    for (int i = 0; i < n; ++i) {
+        String name = "/seq_";
+        name += i;
+        name += ".txt";
+
+        File out = SPIFFS.open(name, "w");
+        REQUIRE(out);
+
+        out.println(i);
+    }
+
+    {
+        Dir root = SPIFFS.openDir("/");
+        while (root.next()) {
+            String fileName = root.fileName();
+            CHECK(fileName.indexOf("/seq_") == 0);
+            int i = fileName.substring(5).toInt();
+            CHECK(i >= 0 && i < n);
+            found[i]++;
+        }
+
+        for (auto f : found) {
+            CHECK(f == 1);
+        }
+    }
+
+    {
+        Dir root = SPIFFS.openDir("/");
+        while (root.next()) {
+            String fileName = root.fileName();
+            CHECK(SPIFFS.remove(fileName));
+        }
+    }
+}
+
+TEST_CASE("files can be renamed", "[fs]")
+{
+    REQUIRE(SPIFFS.begin());
+    {
+        File tmp = SPIFFS.open("/tmp1.txt", "w");
+        tmp.println("rename test");
+    }
+
+    {
+        CHECK(SPIFFS.rename("/tmp1.txt", "/tmp2.txt"));
+
+        File tmp2 = SPIFFS.open("/tmp2.txt", "r");
+        CHECK(tmp2);
+    }
+}
+
+TEST_CASE("FS::info works","[fs]")
+{
+    REQUIRE(SPIFFS.begin());
+    FSInfo info;
+    CHECK(SPIFFS.info(info));
+
+    Serial.printf("Total: %u\nUsed: %u\nBlock: %u\nPage: %u\nMax open files: %u\nMax path len: %u\n",
+                  info.totalBytes,
+                  info.usedBytes,
+                  info.blockSize,
+                  info.pageSize,
+                  info.maxOpenFiles,
+                  info.maxPathLength
+                 );
+}
+
+TEST_CASE("FS is empty after format","[fs]")
+{
+    REQUIRE(SPIFFS.begin());
+    REQUIRE(SPIFFS.format());
+
+    Dir root = SPIFFS.openDir("/");
+    int count = 0;
+    while (root.next()) {
+        ++count;
+    }
+    CHECK(count == 0);
+}
+
+TEST_CASE("Can reopen empty file","[fs]")
+{
+    REQUIRE(SPIFFS.begin());
+    {
+        File tmp = SPIFFS.open("/tmp.txt", "w");
+    }
+    {
+        File tmp = SPIFFS.open("/tmp.txt", "w");
+        CHECK(tmp);
+    }
+}
+
+void loop()
+{
+}