selftest: runqemu: use better error message when asserts fail

* It was showing whole log and that the runqemu command failed, but not
  where the log file is, nor why it thinks the runqemu failed

[YOCTO #12937]

(From OE-Core rev: c79334f7bd52db6edf05f05616c5a3398d32a55c)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit ad4b72e6524114a3bdee10cab71f194ea143cd24)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/meta/lib/oeqa/selftest/cases/runqemu.py b/meta/lib/oeqa/selftest/cases/runqemu.py
index e72dc1036e..d3eeee3b41 100644
--- a/meta/lib/oeqa/selftest/cases/runqemu.py
+++ b/meta/lib/oeqa/selftest/cases/runqemu.py
@@ -65,7 +65,8 @@ SYSLINUX_TIMEOUT = "10"
         cmd = "%s %s iso" % (self.cmd_common, self.machine)
         with runqemu(self.recipe, ssh=False, launch_cmd=cmd) as qemu:
             with open(qemu.qemurunnerlog) as f:
-                self.assertIn('media=cdrom', f.read(), "Failed: %s" % cmd)
+                text_in = 'media=cdrom'
+                self.assertIn(text_in, f.read(), "Failed to find '%s' in '%s' after running '%s'" % (text_in, qemu.qemurunnerlog, cmd))
 
     def test_boot_recipe_image(self):
         """Test runqemu recipe-image"""
@@ -80,14 +81,16 @@ SYSLINUX_TIMEOUT = "10"
         cmd = "%s %s wic.vmdk" % (self.cmd_common, self.recipe)
         with runqemu(self.recipe, ssh=False, launch_cmd=cmd) as qemu:
             with open(qemu.qemurunnerlog) as f:
-                self.assertIn('format=vmdk', f.read(), "Failed: %s" % cmd)
+                text_in = 'format=vmdk'
+                self.assertIn(text_in, f.read(), "Failed to find '%s' in '%s' after running '%s'" % (text_in, qemu.qemurunnerlog, cmd))
 
     def test_boot_recipe_image_vdi(self):
         """Test runqemu recipe-image vdi"""
         cmd = "%s %s wic.vdi" % (self.cmd_common, self.recipe)
         with runqemu(self.recipe, ssh=False, launch_cmd=cmd) as qemu:
             with open(qemu.qemurunnerlog) as f:
-                self.assertIn('format=vdi', f.read(), "Failed: %s" % cmd)
+                text_in = 'format=vdi'
+                self.assertIn(text_in, f.read(), "Failed to find '%s' in '%s' after running '%s'" % (text_in, qemu.qemurunnerlog, cmd))
 
     def test_boot_deploy(self):
         """Test runqemu deploy_dir_image"""