Fix small mjtest issue

mjtest/environment.py

@@ -191,13 +191,8 @@ class Environment:
         if os.path.exists(dst_file) and os.path.isfile(dst_file) and os.path.getmtime(file) < os.path.getmtime(dst_file) and False:
             _LOG.debug("File '{}' already exists in a pre processed form".format(os.path.relpath(file)))
             return dst_file
-        cur = os.path.split(dst_file)[0]
-        while not os.path.exists(cur):
-            os.mkdir(cur)
-            cur = os.path.split(cur)[0]
-
         if not os.path.exists(dst_dir):
-            os.mkdir(dst_dir)
+            os.makedirs(dst_dir, exist_ok=True)
         try:
             PreProcessor(file, import_base_dir, dst_file).preprocess()
         except:

mjtest/test/exec_tests.py

@@ -43,7 +43,7 @@ class JavaExecTest(BasicSyntaxTest):
         is_big_testcase = "big" in self.file
         timeout = self.env.big_timeout if is_big_testcase else self.env.timeout
         base_filename = path.basename(self.file).split(".")[0]
-        tmp_dir = self.env.create_tmpdir()
+        tmp_dir = self.env.create_pid_local_tmpdir()
         shutil.copy(self.preprocessed_file, path.join(tmp_dir, base_filename + ".java"))
         cwd = os.getcwd()
         os.chdir(tmp_dir)

mjtest/test/tests.py

@@ -352,6 +352,7 @@ class ExtensibleTestResult(TestResult):
                     texts.append(self._ident(msg.content))
                 else:
                     texts.append(msg.content)
+                texts.append("")
             else:
                 texts.append("{}: {}".format(msg.title, msg.content))
         return "\n".join(texts)