test: drivers: flash: common: Copied size can't exceed page.size

flash_copy() is performed on a page.size span but following flash_read()
verification step is performed on EXPECTED_SIZE length (512).

This doesn't work on devices where page.size is lower than EXPECTED_SIZE,
such as STM32L1 where page size is 256.

To fix this, perform verification on the smalest value between page.size
and EXPECTED_SIZE.

Signed-off-by: Erwan Gouriou <[email protected]>

Author: erwango

tests/drivers/flash/common/src/main.c

@@ -397,8 +397,10 @@ static void test_flash_copy_inner(const struct device *src_dev, off_t src_offset
 
 	if ((expected_result == 0) && (size != 0) && (src_offset != dst_offset)) {
 		/* verify a successful copy */
-		zassert_ok(flash_read(flash_dev, TEST_AREA_OFFSET, expected, EXPECTED_SIZE));
-		for (int i = 0; i < EXPECTED_SIZE; i++) {
+		off_t copy_size = MIN(size, EXPECTED_SIZE);
+
+		zassert_ok(flash_read(flash_dev, TEST_AREA_OFFSET, expected, copy_size));
+		for (int i = 0; i < copy_size; i++) {
 			zassert_equal(buf[i], 0xaa, "incorrect data (%02x) at %d", buf[i], i);
 		}
 	}