oeqa.buildperf: make tests independent

Add test set-up functionality so that the individual tests do not depend
on each other. This should make sure that a failure in one test does not
affect the results of another test. The patch also makes it reasonable
to run only a subset of the tests by using the --run-tests option.

The increase in total execution time of the full suite - caused by the
additional set-up steps - is insignificant because normally no
additional tasks need to be run. The previous test has already done all
set-up work.

(From OE-Core rev: 69b3c63e32d09ea4a41b21daacdff6bf1fc447c1)

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/buildperf/test_basic.py

@@ -23,7 +23,6 @@ class Test1P1(BuildPerfTestCase):
 
     def test1(self):
         """Measure wall clock of bitbake core-image-sato and size of tmp dir"""
-        self.log_cmd_output("bitbake {} -c fetchall".format(self.build_target))
         self.rm_tmp()
         self.rm_sstate()
         self.rm_cache()
@@ -39,8 +38,10 @@ class Test1P2(BuildPerfTestCase):
 
     def test12(self):
         """Measure bitbake virtual/kernel"""
-        self.log_cmd_output("bitbake {} -c cleansstate".format(
-            self.build_target))
+        # Build and cleans state in order to get all dependencies pre-built
+        self.log_cmd_output(['bitbake', self.build_target])
+        self.log_cmd_output(['bitbake', self.build_target, '-c', 'cleansstate'])
+
         self.sync()
         self.measure_cmd_resources(['bitbake', self.build_target], 'build',
                                    'bitbake ' + self.build_target)
@@ -73,6 +74,9 @@ class Test2(BuildPerfTestCase):
 
     def test2(self):
         """Measure bitbake core-image-sato -c rootfs with sstate"""
+        # Build once in order to populate sstate cache
+        self.log_cmd_output(['bitbake', self.build_target])
+
         self.rm_tmp()
         self.rm_cache()
         self.sync()