[PATCH 4/4] tests/acceptance/integratorcp: Verify Tux is displayed on framebuffer

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

From: Philippe Mathieu-Daudé <f4bug@amsat.org>

Add a test that verifies the Tux logo is displayed on the framebuffer.

We simply follow the OpenCV "Template Matching with Multiple Objects"
tutorial, replacing Lionel Messi by Tux:
https://docs.opencv.org/4.2.0/d4/dc6/tutorial_py_template_matching.html

When OpenCV and NumPy are installed, this test can be run using:

  $ AVOCADO_ALLOW_UNTRUSTED_CODE=hmmm \
    avocado --show=app,framebuffer run -t device:framebuffer \
      tests/acceptance/machine_arm_integratorcp.py
  JOB ID     : 8c46b0f8269242e87d738247883ea2a470df949e
  JOB LOG    : avocado/job-results/job-2020-01-31T21.38-8c46b0f/job.log
   (1/1) tests/acceptance/machine_arm_integratorcp.py:IntegratorMachine.test_framebuffer_tux_logo:
  framebuffer: found Tux at position [x, y] = (0, 0)
  PASS (3.96 s)
  RESULTS    : PASS 1 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
  JOB TIME   : 4.23 s

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Message-Id: <20200131211102.29612-3-f4bug@amsat.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 tests/acceptance/machine_arm_integratorcp.py | 52 ++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/tests/acceptance/machine_arm_integratorcp.py b/tests/acceptance/machine_arm_integratorcp.py
index 22afd3b82a..49c8ebff78 100644
--- a/tests/acceptance/machine_arm_integratorcp.py
+++ b/tests/acceptance/machine_arm_integratorcp.py
@@ -9,11 +9,26 @@
 # later.  See the COPYING file in the top-level directory.
 
 import os
+import logging
 
 from avocado import skipUnless
 from avocado_qemu import Test
 from avocado_qemu import wait_for_console_pattern
 
+
+NUMPY_AVAILABLE = True
+try:
+    import numpy as np
+except ImportError:
+    NUMPY_AVAILABLE = False
+
+CV2_AVAILABLE = True
+try:
+    import cv2
+except ImportError:
+    CV2_AVAILABLE = False
+
+
 class IntegratorMachine(Test):
 
     timeout = 90
@@ -45,3 +60,40 @@ def test_integratorcp_console(self):
         """
         self.boot_integratorcp()
         wait_for_console_pattern(self, 'Log in as root')
+
+    @skipUnless(NUMPY_AVAILABLE, 'Python NumPy not installed')
+    @skipUnless(CV2_AVAILABLE, 'Python OpenCV not installed')
+    @skipUnless(os.getenv('AVOCADO_ALLOW_UNTRUSTED_CODE'), 'untrusted code')
+    def test_framebuffer_tux_logo(self):
+        """
+        Boot Linux and verify the Tux logo is displayed on the framebuffer.
+        :avocado: tags=arch:arm
+        :avocado: tags=machine:integratorcp
+        :avocado: tags=device:pl110
+        :avocado: tags=device:framebuffer
+        """
+        screendump_path = os.path.join(self.workdir, "screendump.pbm")
+        tuxlogo_url = ('https://github.com/torvalds/linux/raw/v2.6.12/'
+                       'drivers/video/logo/logo_linux_vga16.ppm')
+        tuxlogo_hash = '3991c2ddbd1ddaecda7601f8aafbcf5b02dc86af'
+        tuxlogo_path = self.fetch_asset(tuxlogo_url, asset_hash=tuxlogo_hash)
+
+        self.boot_integratorcp()
+        framebuffer_ready = 'Console: switching to colour frame buffer device'
+        wait_for_console_pattern(self, framebuffer_ready)
+        self.vm.command('human-monitor-command', command_line='stop')
+        self.vm.command('human-monitor-command',
+                        command_line='screendump %s' % screendump_path)
+        logger = logging.getLogger('framebuffer')
+
+        cpu_count = 1
+        match_threshold = 0.92
+        screendump_bgr = cv2.imread(screendump_path)
+        screendump_gray = cv2.cvtColor(screendump_bgr, cv2.COLOR_BGR2GRAY)
+        result = cv2.matchTemplate(screendump_gray, cv2.imread(tuxlogo_path, 0),
+                                   cv2.TM_CCOEFF_NORMED)
+        loc = np.where(result >= match_threshold)
+        tux_count = 0
+        for tux_count, pt in enumerate(zip(*loc[::-1]), start=1):
+            logger.debug('found Tux at position [x, y] = %s', pt)
+        self.assertGreaterEqual(tux_count, cpu_count)
-- 
2.21.1