fix ImportError

Fixes deepmodeling#1000. Add tests.

dpgen/main.py

@@ -16,7 +16,7 @@
 from dpgen.database.run import db_run
 from dpgen.tools.run_report import run_report
 from dpgen.tools.auto_gen_param import auto_gen_param
-from dpgen import info, __version__, __date__
+from dpgen import info, __version__
 
 
 

tests/test_cli.py

@@ -0,0 +1,9 @@
+import sys
+import subprocess as sp
+
+
+class TestCLI(unittest.TestCase):
+    def test_cli(self):
+        sp.check_output([sys.executable, "-m", "dpgen", "-h"])
+        for subcommand in ('run', 'simplify', 'init_surf', 'init_bulk', 'init_reaction', 'autotest'):
+            sp.check_output([sys.executable, "-m", "dpgen", subcommand, "-h"])