Pass cmd line args onwards.

run_tests.py

@@ -31,5 +31,5 @@ if __name__ == '__main__':
             myenv['CXX'] = 'clang++'
             print("'\nRunnint unittests with clang.\n")
             returncode += subprocess.call([sys.executable, 'run_unittests.py'], env=myenv)
-    returncode += subprocess.call([sys.executable, 'run_project_tests.py'])
+    returncode += subprocess.call([sys.executable, 'run_project_tests.py'] + sys.argv[1:])
     sys.exit(returncode)

run_unittests.py

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import unittest, os, shutil
+import unittest, os, sys, shutil
 import subprocess
 import re
 
@@ -32,7 +32,7 @@ class LinuxlikeTests(unittest.TestCase):
         super().setUp()
         src_root = os.path.split(__file__)[0]
         self.builddir = 'unittestdir' # fixme to be unique
-        self.meson_command = [os.path.join(src_root, 'meson.py')]
+        self.meson_command = [sys.executable, os.path.join(src_root, 'meson.py')]
         self.ninja_command = ['ninja', '-C', self.builddir]
         self.common_test_dir = os.path.join(src_root, 'test cases/common')
         os.mkdir(self.builddir)