Test fifo8_peek_buf() can fill a buffer with wrapped data.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <20240906132909.78886-3-philmd@linaro.org>
---
 tests/unit/test-fifo.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tests/unit/test-fifo.c b/tests/unit/test-fifo.c
index 9b3a4940d0..fada526b6c 100644
--- a/tests/unit/test-fifo.c
+++ b/tests/unit/test-fifo.c
@@ -158,7 +158,7 @@ static void test_fifo8_peek_buf_wrap(void)
     Fifo8 fifo;
     uint8_t data_in1[] = { 0x1, 0x2, 0x3, 0x4 };
     uint8_t data_in2[] = { 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc };
-    uint8_t data_out[4];
+    uint8_t data_out[8];
     int count;
 
     fifo8_create(&fifo, 8);
@@ -174,6 +174,13 @@ static void test_fifo8_peek_buf_wrap(void)
     g_assert(data_out[0] == 0x5 && data_out[1] == 0x6 &&
              data_out[2] == 0x7 && data_out[3] == 0x8);
 
+    count = fifo8_peek_buf(&fifo, data_out, 8);
+    g_assert(count == 8);
+    g_assert(data_out[0] == 0x5 && data_out[1] == 0x6 &&
+             data_out[2] == 0x7 && data_out[3] == 0x8);
+    g_assert(data_out[4] == 0x9 && data_out[5] == 0xa &&
+             data_out[6] == 0xb && data_out[7] == 0xc);
+
     g_assert(fifo8_num_used(&fifo) == 8);
     fifo8_destroy(&fifo);
 }
-- 
2.45.2