tests/functional: Convert the m68k nextcube test with tesseract

The code that handles running of tesseract needs to be tweaked a little
bit to be able to run without the functions from avocado.utils, and
while we're at it, drop some legacy stuff that was still there due to
Tesseract 3 support that we already dropped a while ago.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240830133841.142644-29-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/functional/test_m68k_nextcube.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+#
+# Functional test that boots a VM and run OCR on the framebuffer
+#
+# Copyright (c) 2019 Philippe Mathieu-Daudé <f4bug@amsat.org>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or
+# later.  See the COPYING file in the top-level directory.
+
+import os
+import time
+
+from qemu_test import QemuSystemTest, Asset
+from unittest import skipUnless
+
+from qemu_test.tesseract import tesseract_available, tesseract_ocr
+
+PIL_AVAILABLE = True
+try:
+    from PIL import Image
+except ImportError:
+    PIL_AVAILABLE = False
+
+
+class NextCubeMachine(QemuSystemTest):
+
+    timeout = 15
+
+    ASSET_ROM = Asset(('https://sourceforge.net/p/previous/code/1350/tree/'
+                       'trunk/src/Rev_2.5_v66.BIN?format=raw'),
+                      '1b753890b67095b73e104c939ddf62eca9e7d0aedde5108e3893b0ed9d8000a4')
+
+    def check_bootrom_framebuffer(self, screenshot_path):
+        rom_path = self.ASSET_ROM.fetch()
+
+        self.vm.add_args('-bios', rom_path)
+        self.vm.launch()
+
+        self.log.info('VM launched, waiting for display')
+        # TODO: Use avocado.utils.wait.wait_for to catch the
+        #       'displaysurface_create 1120x832' trace-event.
+        time.sleep(2)
+
+        self.vm.cmd('human-monitor-command',
+                    command_line='screendump %s' % screenshot_path)
+
+    @skipUnless(PIL_AVAILABLE, 'Python PIL not installed')
+    def test_bootrom_framebuffer_size(self):
+        self.set_machine('next-cube')
+        screenshot_path = os.path.join(self.workdir, "dump.ppm")
+        self.check_bootrom_framebuffer(screenshot_path)
+
+        width, height = Image.open(screenshot_path).size
+        self.assertEqual(width, 1120)
+        self.assertEqual(height, 832)
+
+    # Tesseract 4 adds a new OCR engine based on LSTM neural networks. The
+    # new version is faster and more accurate than version 3. The drawback is
+    # that it is still alpha-level software.
+    @skipUnless(tesseract_available(4), 'tesseract OCR tool not available')
+    def test_bootrom_framebuffer_ocr_with_tesseract(self):
+        self.set_machine('next-cube')
+        screenshot_path = os.path.join(self.workdir, "dump.ppm")
+        self.check_bootrom_framebuffer(screenshot_path)
+        lines = tesseract_ocr(screenshot_path)
+        text = '\n'.join(lines)
+        self.assertIn('Testing the FPU', text)
+        self.assertIn('System test failed. Error code', text)
+        self.assertIn('Boot command', text)
+        self.assertIn('Next>', text)
+
+if __name__ == '__main__':
+    QemuSystemTest.main()