nvs_flash: introduce write failures after each word written

Previously the test bench would check failure recovery by introducing error after each write operation.
This makes checks a bit more extensive (and much longer) by failing after every word written. Surprisingly, this change didn't expose any bugs.

components/nvs_flash/test/spi_flash_emulation.h

@@ -74,11 +74,11 @@ public:
             return false;
         }
         
-        if (mFailCountdown != SIZE_MAX && mFailCountdown-- == 0) {
-            return false;
-        }
-
         for (size_t i = 0; i < size / 4; ++i) {
+            if (mFailCountdown != SIZE_MAX && mFailCountdown-- == 0) {
+                return false;
+            }
+
             uint32_t sv = src[i];
             size_t pos = dstAddr / 4 + i;
             uint32_t& dv = mData[pos];

components/nvs_flash/test/test_nvs.cpp

@@ -894,7 +894,7 @@ TEST_CASE("test recovery from sudden poweroff", "[.][long][nvs][recovery][monkey
     
     size_t totalOps = 0;
     int lastPercent = -1;
-    for (uint32_t errDelay = 4; ; ++errDelay) {
+    for (uint32_t errDelay = 0; ; ++errDelay) {
         INFO(errDelay);
         emu.randomize(seed);
         emu.clearStats();
@@ -903,23 +903,25 @@ TEST_CASE("test recovery from sudden poweroff", "[.][long][nvs][recovery][monkey
         
         if (totalOps != 0) {
             int percent = errDelay * 100 / totalOps;
-            if (percent != lastPercent) {
+            if (percent > lastPercent) {
                 printf("%d/%d (%d%%)\r\n", errDelay, static_cast<int>(totalOps), percent);
                 lastPercent = percent;
             }
         }
         
-        TEST_ESP_OK(nvs_flash_init_custom(NVS_FLASH_SECTOR, NVS_FLASH_SECTOR_COUNT_MIN));
 
         nvs_handle handle;
-        TEST_ESP_OK(nvs_open("namespace1", NVS_READWRITE, &handle));
-        
         size_t count = iter_count;
-        if(test.doRandomThings(handle, gen, count) != ESP_ERR_FLASH_OP_FAIL) {
-            nvs_close(handle);
-            break;
+
+        if (nvs_flash_init_custom(NVS_FLASH_SECTOR, NVS_FLASH_SECTOR_COUNT_MIN) == ESP_OK) {
+            if (nvs_open("namespace1", NVS_READWRITE, &handle) == ESP_OK) {
+                if(test.doRandomThings(handle, gen, count) != ESP_ERR_FLASH_OP_FAIL) {
+                    nvs_close(handle);
+                    break;
+                }
+                nvs_close(handle);
+            }
         }
-        nvs_close(handle);
         
         TEST_ESP_OK(nvs_flash_init_custom(NVS_FLASH_SECTOR, NVS_FLASH_SECTOR_COUNT_MIN));
         TEST_ESP_OK(nvs_open("namespace1", NVS_READWRITE, &handle));
@@ -929,7 +931,7 @@ TEST_CASE("test recovery from sudden poweroff", "[.][long][nvs][recovery][monkey
             CHECK(0);
         }
         nvs_close(handle);
-        totalOps = emu.getEraseOps() + emu.getWriteOps();
+        totalOps = emu.getEraseOps() + emu.getWriteBytes() / 4;
     }
 }