support/testing: use .assertRunOk() when possible

The BRTest() class implements an assertRunOk() method that does the
very common work of running a command inside the emulator, and
checking that it is successful.

This commit changes all locations where this .assertRunOk() method can
be used, instead of open-coding the same logic.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

support/testing/tests/package/test_python_pytest.py

@@ -15,5 +15,4 @@ class TestPythonPy3Pytest(TestPythonPackageBase):
     def run_sample_scripts(self):
         for script in self.sample_scripts:
             cmd = self.interpreter + " -m pytest " + os.path.basename(script)
-            _, exit_code = self.emulator.run(cmd, timeout=self.timeout)
-            self.assertEqual(exit_code, 0)
+            self.assertRunOk(cmd, timeout=self.timeout)