From patchwork Fri Sep 6 13:12:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= X-Patchwork-Id: 13794179 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 08316CE7B09 for ; Fri, 6 Sep 2024 13:13:42 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1smYlL-0003Xc-43; Fri, 06 Sep 2024 09:12:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1smYlJ-0003T4-O6 for qemu-devel@nongnu.org; Fri, 06 Sep 2024 09:12:29 -0400 Received: from mail-ej1-x62e.google.com ([2a00:1450:4864:20::62e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1smYlI-0006WQ-6Y for qemu-devel@nongnu.org; Fri, 06 Sep 2024 09:12:29 -0400 Received: by mail-ej1-x62e.google.com with SMTP id a640c23a62f3a-a89c8db505bso281646866b.0 for ; Fri, 06 Sep 2024 06:12:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1725628346; x=1726233146; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=xlW+VXX8IoMKaXfrpm1YbHCvNIPynyn64aMHFczAQAA=; b=MUl+/r2eV+Llh2jRFh4QKPcnmKGyKcbS/4jwIj4qLqDUp+nbcjD51vCjSZM3iGW1jx WfGnJmgIJZtBEtNb1/VfXl+QzgHfyZGgxrahREyll90oMvQGHBvtbE2DE1iBvB/IIRSQ 2u+EoVrvu07fVODGHfJ3/OTeQhC+bJJzU2ScwQt9nfvk2520ThpmcqRMijkTSqNqYPH6 YuLeh4QbuLpYizQlHHZ/A572iuhl8LmlnOC209bHYOcQvpDMPjYcA0oL+0qLJunyT7oV 5yjWwTgQ8aEMZmtGZx4VxsO+NDBB8QOFT0AZjcrcMAgHfmCOAA6WIypI5fFigM2kAelf 3DGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725628346; x=1726233146; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=xlW+VXX8IoMKaXfrpm1YbHCvNIPynyn64aMHFczAQAA=; b=WkQeKNSayTnE7LCHq5Zmf60h97PNi4C8/jJV12kedZyYtKDCHScduIVpROTRzR6xA+ WOP55/AlFL6xVXp516oZzB+3SNq+izLGaFsH2eI4O0iYt/mIcWwTEafjd41wrbstny3p NdySo+azagyBgA17WpQKH5xM3/WBSiVm97G+4M/5SC+Uv0LETy2UsEz3MYHX0tRv4clZ DgJj6x/nSM4J3AHnT5xoizAAsnOOKkpFxmwchXecPpWHGQwnnmLcC+IyxByWT2BdxT3H lBmwcMoaQvu+7kNT7uxy+UZAoxGenwM99vl8wpp7RXiGjNXydoia+Lbnrs7It37CMpf8 rbUg== X-Gm-Message-State: AOJu0YzvqG41bmazg942cJHawL8VsU+fzz84S7/4DoCp6+LP5jkQgmsE FyZ2j3YDVSzHaXG8utlhnFgXUCMJAGcp0hzYUZeugvkzPS2v5NTzJwaADA6ECSKU1rlziwr/N1E 8 X-Google-Smtp-Source: AGHT+IE0adYOLiwLwAxzEbot6AnY93c1UwstU6m/jyZOIAhewC8qhi9wFF74baHKxOshu0GL+7Zgyg== X-Received: by 2002:a17:907:703:b0:a86:78fd:1df0 with SMTP id a640c23a62f3a-a8a88668305mr207090666b.34.1725628345695; Fri, 06 Sep 2024 06:12:25 -0700 (PDT) Received: from localhost.localdomain ([80.215.236.92]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a8a8b7da1d0sm93248566b.50.2024.09.06.06.12.24 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Fri, 06 Sep 2024 06:12:25 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Mark Cave-Ayland , Octavian Purdila , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= Subject: [PATCH 1/3] tests/unit: Strengthen FIFO8 tests Date: Fri, 6 Sep 2024 15:12:15 +0200 Message-ID: <20240906131217.78159-2-philmd@linaro.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240906131217.78159-1-philmd@linaro.org> References: <20240906131217.78159-1-philmd@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::62e; envelope-from=philmd@linaro.org; helo=mail-ej1-x62e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Replace reused bytes { 0x1, 0x2, 0x3, 0x4 } by { 0x9, 0xa, 0xb, 0xc } to be sure a different value is overwritten. Signed-off-by: Philippe Mathieu-Daudé --- tests/unit/test-fifo.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/tests/unit/test-fifo.c b/tests/unit/test-fifo.c index 1e54cde871..60436a7600 100644 --- a/tests/unit/test-fifo.c +++ b/tests/unit/test-fifo.c @@ -22,7 +22,7 @@ static void test_fifo8_pop_bufptr_wrap(void) { Fifo8 fifo; uint8_t data_in1[] = { 0x1, 0x2, 0x3, 0x4 }; - uint8_t data_in2[] = { 0x5, 0x6, 0x7, 0x8, 0x1, 0x2 }; + uint8_t data_in2[] = { 0x5, 0x6, 0x7, 0x8, 0x9, 0xa }; const uint8_t *buf; uint32_t count; @@ -112,7 +112,7 @@ static void test_fifo8_pop_buf_wrap(void) { Fifo8 fifo; uint8_t data_in1[] = { 0x1, 0x2, 0x3, 0x4 }; - uint8_t data_in2[] = { 0x5, 0x6, 0x7, 0x8, 0x1, 0x2, 0x3, 0x4 }; + uint8_t data_in2[] = { 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc }; uint8_t data_out[4]; int count; @@ -126,8 +126,8 @@ static void test_fifo8_pop_buf_wrap(void) g_assert(count == 4); count = fifo8_pop_buf(&fifo, data_out, 4); g_assert(count == 4); - g_assert(data_out[0] == 0x1 && data_out[1] == 0x2 && - data_out[2] == 0x3 && data_out[3] == 0x4); 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Signed-off-by: Philippe Mathieu-Daudé --- tests/unit/test-fifo.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tests/unit/test-fifo.c b/tests/unit/test-fifo.c index 60436a7600..4706bf8708 100644 --- a/tests/unit/test-fifo.c +++ b/tests/unit/test-fifo.c @@ -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); } From patchwork Fri Sep 6 13:12:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= X-Patchwork-Id: 13794177 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 36421CE7B0B for ; 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Fri, 06 Sep 2024 06:12:36 -0700 (PDT) Received: from localhost.localdomain ([80.215.236.92]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a8a83ed05c9sm122141066b.114.2024.09.06.06.12.35 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Fri, 06 Sep 2024 06:12:36 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Mark Cave-Ayland , Octavian Purdila , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= Subject: [PATCH 3/3] tests/unit: Comment FIFO8 tests Date: Fri, 6 Sep 2024 15:12:17 +0200 Message-ID: <20240906131217.78159-4-philmd@linaro.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240906131217.78159-1-philmd@linaro.org> References: <20240906131217.78159-1-philmd@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::132; envelope-from=philmd@linaro.org; helo=mail-lf1-x132.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add comments describing how the FIFO evolves during each test. Signed-off-by: Philippe Mathieu-Daudé --- tests/unit/test-fifo.c | 190 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 188 insertions(+), 2 deletions(-) diff --git a/tests/unit/test-fifo.c b/tests/unit/test-fifo.c index 4706bf8708..14153c41fa 100644 --- a/tests/unit/test-fifo.c +++ b/tests/unit/test-fifo.c @@ -27,14 +27,36 @@ static void test_fifo8_pop_bufptr_wrap(void) uint32_t count; fifo8_create(&fifo, 8); + /* + * head --v-- tail used = 0 + * FIFO: [ . . . . . . . . ] + */ fifo8_push_all(&fifo, data_in1, sizeof(data_in1)); + /* + * head --v ]-- tail used = 4 + * FIFO: [ 1 2 3 4 . . . . ] + */ buf = fifo8_pop_bufptr(&fifo, 2, &count); + /* + * head --v ]-- tail used = 2 + * FIFO: [ 1 2 3 4 . . . . ] + * buf --^ count = 2 + */ g_assert(count == 2); g_assert(buf[0] == 0x1 && buf[1] == 0x2); fifo8_push_all(&fifo, data_in2, sizeof(data_in2)); + /* + * tail --]v-- head used = 8 + * FIFO: [ 9 a 3 4 5 6 7 8 ] + */ buf = fifo8_pop_bufptr(&fifo, 8, &count); + /* + * head --v ]-- tail used = 2 + * FIFO: [ 9 a 3 4 5 6 7 8 ] + * buf --^ count = 6 + */ g_assert(count == 6); g_assert(buf[0] == 0x3 && buf[1] == 0x4 && buf[2] == 0x5 && buf[3] == 0x6 && buf[4] == 0x7 && buf[5] == 0x8); @@ -51,9 +73,22 @@ static void test_fifo8_pop_bufptr(void) uint32_t count; fifo8_create(&fifo, 8); + /* + * head --v-- tail used = 0 + * FIFO: [ . . . . . . . . ] + */ fifo8_push_all(&fifo, data_in, sizeof(data_in)); + /* + * head --v ]-- tail used = 4 + * FIFO: [ 1 2 3 4 . . . . ] + */ buf = fifo8_pop_bufptr(&fifo, 2, &count); + /* + * head --v ]-- tail used = 2 + * FIFO: [ 1 2 3 4 . . . . ] + * buf --^ count = 2 + */ g_assert(count == 2); g_assert(buf[0] == 0x1 && buf[1] == 0x2); @@ -65,23 +100,50 @@ static void test_fifo8_peek_bufptr_wrap(void) { Fifo8 fifo; uint8_t data_in1[] = { 0x1, 0x2, 0x3, 0x4 }; - uint8_t data_in2[] = { 0x5, 0x6, 0x7, 0x8, 0x1, 0x2 }; + uint8_t data_in2[] = { 0x5, 0x6, 0x7, 0x8, 0x9, 0xa }; const uint8_t *buf; uint32_t count; fifo8_create(&fifo, 8); + /* + * head --v-- tail used = 0 + * FIFO: { . . . . . . . . } + */ fifo8_push_all(&fifo, data_in1, sizeof(data_in1)); + /* + * head --v ]-- tail used = 4 + * FIFO: { 1 2 3 4 . . . . } + */ buf = fifo8_peek_bufptr(&fifo, 2, &count); + /* + * head --v ]-- tail used = 4 + * FIFO: { 1 2 3 4 . . . . } + * buf: [ 1 2 ] count = 2 + */ g_assert(count == 2); g_assert(buf[0] == 0x1 && buf[1] == 0x2); buf = fifo8_pop_bufptr(&fifo, 2, &count); + /* + * head --v ]-- tail used = 2 + * FIFO: { 1 2 3 4 . . . . } + * buf: [ 1 2 ] count = 2 + */ g_assert(count == 2); g_assert(buf[0] == 0x1 && buf[1] == 0x2); fifo8_push_all(&fifo, data_in2, sizeof(data_in2)); + /* + * tail ---]v-- head used = 8 + * FIFO: { 9 a 3 4 5 6 7 8 } + */ buf = fifo8_peek_bufptr(&fifo, 8, &count); + /* + * tail --]v-- head used = 8 + * FIFO: { 9 a 3 4 5 6 7 8 } + * buf: [ 3 4 5 6 7 8 ] count = 6 + */ g_assert(count == 6); g_assert(buf[0] == 0x3 && buf[1] == 0x4 && buf[2] == 0x5 && buf[3] == 0x6 && buf[4] == 0x7 && buf[5] == 0x8); @@ -98,9 +160,22 @@ static void test_fifo8_peek_bufptr(void) uint32_t count; fifo8_create(&fifo, 8); + /* + * head --v-- tail used = 0 + * FIFO: { . . . . . . . . } + */ fifo8_push_all(&fifo, data_in, sizeof(data_in)); + /* + * head --v ]-- tail used = 4 + * FIFO: { 1 2 3 4 . . . . } + */ buf = fifo8_peek_bufptr(&fifo, 2, &count); + /* + * head --v ]-- tail used = 4 + * FIFO: { 1 2 3 4 . . . . } + * buf: [ 1 2 ] count = 2 + */ g_assert(count == 2); g_assert(buf[0] == 0x1 && buf[1] == 0x2); @@ -117,14 +192,38 @@ static void test_fifo8_pop_buf_wrap(void) int count; fifo8_create(&fifo, 8); + /* + * head --v-- tail used = 0 + * FIFO: { . . . . . . . . } + */ fifo8_push_all(&fifo, data_in1, sizeof(data_in1)); + /* + * head --v ]-- tail used = 4 + * FIFO: { 1 2 3 4 . . . . } + */ fifo8_pop_buf(&fifo, NULL, 4); + /* + * tail --]v-- head used = 0 + * FIFO: [ 1 2 3 4 . . . . ] + */ fifo8_push_all(&fifo, data_in2, sizeof(data_in2)); + /* + * tail --]v-- head used = 8 + * FIFO: { 9 a b c 5 6 7 8 } + */ count = fifo8_pop_buf(&fifo, NULL, 4); + /* + * head --v ]-- tail used = 4 + * FIFO: { 9 a b c 5 6 7 8 } + */ g_assert(count == 4); count = fifo8_pop_buf(&fifo, data_out, 4); + /* + * tail --]v-- head used = 0 + * FIFO: { 9 a b c 5 6 7 8 } + */ g_assert(count == 4); g_assert(data_out[0] == 0x9 && data_out[1] == 0xa && data_out[2] == 0xb && data_out[3] == 0xc); @@ -141,9 +240,21 @@ static void test_fifo8_pop_buf(void) int count; fifo8_create(&fifo, 8); + /* + * head --v-- tail used = 0 + * FIFO: { . . . . . . . . } + */ fifo8_push_all(&fifo, data_in, sizeof(data_in)); + /* + * head --v ]-- tail used = 4 + * FIFO: { 1 2 3 4 . . . . } + */ count = fifo8_pop_buf(&fifo, NULL, 4); + /* + * tail --]v-- head used = 0 + * FIFO: { 1 2 3 4 . . . . } + */ g_assert(count == 4); count = fifo8_pop_buf(&fifo, data_out, 4); g_assert(data_out[0] == 0x5 && data_out[1] == 0x6 && @@ -162,19 +273,45 @@ static void test_fifo8_peek_buf_wrap(void) int count; fifo8_create(&fifo, 8); + /* + * head --v-- tail used = 0 + * FIFO: { . . . . . . . . } + */ fifo8_push_all(&fifo, data_in1, sizeof(data_in1)); + /* + * head --v ]-- tail used = 4 + * FIFO: { 1 2 3 4 . . . . } + */ fifo8_pop_buf(&fifo, NULL, 4); + /* + * tail --]v-- head used = 0 + * FIFO: { 1 2 3 4 . . . . } + */ fifo8_push_all(&fifo, data_in2, sizeof(data_in2)); + /* + * tail --]v-- head used = 8 + * FIFO: { 9 a b c 5 6 7 8 } + */ count = fifo8_peek_buf(&fifo, NULL, 4); g_assert(count == 4); count = fifo8_peek_buf(&fifo, data_out, 4); + /* + * tail --]v-- head used = 8 + * FIFO: { 9 a b c 5 6 7 8 } + * buf: [ 5 6 7 8 ] count = 4 + */ g_assert(count == 4); 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); + /* + * tail --]v-- head used = 8 + * FIFO: { 9 a b c 5 6 7 8 } + * buf: [ 5 6 7 8 9 a b c ] count = 8 + */ g_assert(count == 8); g_assert(data_out[0] == 0x5 && data_out[1] == 0x6 && data_out[2] == 0x7 && data_out[3] == 0x8); @@ -193,14 +330,27 @@ static void test_fifo8_peek_buf(void) int count; fifo8_create(&fifo, 8); + /* + * head --v-- tail used = 0 + * FIFO: { . . . . . . . . } + */ fifo8_push_all(&fifo, data_in, sizeof(data_in)); + /* + * head --v ]-- tail used = 4 + * FIFO: { 1 2 3 4 . . . . } + */ count = fifo8_peek_buf(&fifo, NULL, 4); g_assert(count == 4); + g_assert(data_out[0] == 0xff && data_out[1] == 0xff && data_out[2] == 0xff && data_out[3] == 0xff); - count = fifo8_peek_buf(&fifo, data_out, 4); + /* + * head --v ]-- tail used = 4 + * FIFO: { 1 2 3 4 . . . . } + * buf: [ 1 2 3 4 ] count = 4 + */ g_assert(count == 4); g_assert(data_out[0] == 0x1 && data_out[1] == 0x2 && data_out[2] == 0x3 && data_out[3] == 0x4); @@ -215,12 +365,28 @@ static void test_fifo8_peek(void) uint8_t c; fifo8_create(&fifo, 8); + /* + * head --v-- tail used = 0 + * FIFO: { . . . . . . . . } + */ fifo8_push(&fifo, 0x1); + /* + * head --v]-- tail used = 1 + * FIFO: { 1 . . . . . . . } + */ fifo8_push(&fifo, 0x2); + /* + * head --v ]-- tail used = 2 + * FIFO: { 1 2 . . . . . . } + */ c = fifo8_peek(&fifo); g_assert(c == 0x1); fifo8_pop(&fifo); + /* + * head --v]-- tail used = 1 + * FIFO: { 1 2 . . . . . . } + */ c = fifo8_peek(&fifo); g_assert(c == 0x2); @@ -234,12 +400,32 @@ static void test_fifo8_pushpop(void) uint8_t c; fifo8_create(&fifo, 8); + /* + * head --v-- tail used = 0 + * FIFO: { . . . . . . . . } + */ fifo8_push(&fifo, 0x1); + /* + * head --v]-- tail used = 1 + * FIFO: { 1 . . . . . . . } + */ fifo8_push(&fifo, 0x2); + /* + * head --v ]-- tail used = 2 + * FIFO: { 1 2 . . . . . . } + */ c = fifo8_pop(&fifo); + /* + * head --v]-- tail used = 1 + * FIFO: { 1 2 . . . . . . } + */ g_assert(c == 0x1); c = fifo8_pop(&fifo); + /* + * tail --]v-- head used = 0 + * FIFO: { 1 2 . . . . . . } + */ g_assert(c == 0x2); g_assert(fifo8_num_used(&fifo) == 0);