tools: fix Python 3 deprecation warning in test.py

PR-URL: #30208
Reviewed-By: Christian Clauss <cclauss@me.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>

tools/test.py

@@ -29,7 +29,6 @@
 
 
 from __future__ import print_function
-import imp
 import logging
 import optparse
 import os
@@ -45,6 +44,27 @@
 import errno
 import copy
 
+
+if sys.version_info >= (3, 5):
+  from importlib import machinery, util
+  def get_module(name, path):
+    loader_details = (machinery.SourceFileLoader, machinery.SOURCE_SUFFIXES)
+    spec = machinery.FileFinder(path, loader_details).find_spec(name)
+    module = util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    return module
+else:
+  import imp
+  def get_module(name, path):
+    file = None
+    try:
+      (file, pathname, description) = imp.find_module(name, [path])
+      return imp.load_module(name, file, pathname, description)
+    finally:
+      if file:
+        file.close()
+
+
 from io import open
 from os.path import join, dirname, abspath, basename, isdir, exists
 from datetime import datetime
@@ -786,18 +806,13 @@ def GetConfiguration(self, context):
     if self.is_loaded:
       return self.config
     self.is_loaded = True
-    file = None
-    try:
-      (file, pathname, description) = imp.find_module('testcfg', [ self.path ])
-      module = imp.load_module('testcfg', file, pathname, description)
-      self.config = module.GetConfiguration(context, self.path)
-      if hasattr(self.config, 'additional_flags'):
-        self.config.additional_flags += context.node_args
-      else:
-        self.config.additional_flags = context.node_args
-    finally:
-      if file:
-        file.close()
+
+    module = get_module('testcfg', self.path)
+    self.config = module.GetConfiguration(context, self.path)
+    if hasattr(self.config, 'additional_flags'):
+      self.config.additional_flags += context.node_args
+    else:
+      self.config.additional_flags = context.node_args
     return self.config
 
   def GetBuildRequirements(self, path, context):