sandbox: Add a test for SCSI

Add a simple uclass test for SCSI. It reads the partition table from a
disk image and checks that it looks correct.

Signed-off-by: Simon Glass <sjg@chromium.org>

test/py/tests/test_ut.py

@@ -114,6 +114,15 @@ def test_ut_dm_init(u_boot_console):
         with open(fn, 'wb') as fh:
             fh.write(data)
 
+    # Create a file with a single partition
+    fn = u_boot_console.config.source_dir + '/scsi.img'
+    if not os.path.exists(fn):
+        data = b'\x00' * (2 * 1024 * 1024)
+        with open(fn, 'wb') as fh:
+            fh.write(data)
+        u_boot_utils.run_and_log(
+            u_boot_console, f'sfdisk {fn}', stdin=b'type=83')
+
 @pytest.mark.buildconfigspec('cmd_bootflow')
 def test_ut_dm_init_bootstd(u_boot_console):
     """Initialise data for bootflow tests"""