tests: Show full logs if PPD_TEST_VERBOSE env is set and use it in meson

It can be useful to inspect the daemon logs in any case, so let's show
the logs details when running in meson.

Then it's up to use the `--verbose` parameter to decide whether to see
them or to inspect them from the generated logs.

tests/integration_test.py

@@ -142,7 +142,9 @@ class Tests(dbusmock.DBusTestCase):
 
     def run(self, result=None):
         super().run(result)
-        if result and len(result.errors) + len(result.failures) > 0 and self.log:
+        if not result or not self.log:
+            return
+        if len(result.errors) + len(result.failures) or os.getenv("PPD_TEST_VERBOSE"):
             with open(self.log.name, encoding="utf-8") as tmpf:
                 sys.stderr.write("\n-------------- daemon log: ----------------\n")
                 sys.stderr.write(tmpf.read())

tests/meson.build

@@ -1,4 +1,5 @@
 envs = environment()
+envs.set('PPD_TEST_VERBOSE', 'true')
 envs.set ('top_builddir', meson.project_build_root())
 envs.set ('top_srcdir', meson.project_source_root())