[playwright] fix tests

haruhi_dl/playwright.py

@@ -22,7 +22,8 @@ class PlaywrightHelper():
             cls._real_import_pw()
         except ImportError as err:
             if fatal is True:
-                raise ExtractorError('Playwright could not be imported: %s' % err.msg, expected=True)
+                raise ExtractorError('Playwright could not be imported: %s' % err.msg if 'msg' in err else '[no err.msg]',
+                                     expected=True)
 
     @classmethod
     def _version(cls):

test/test_playwright.py

@@ -8,6 +8,7 @@ import unittest
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from haruhi_dl.compat import compat_str
+from haruhi_dl.utils import ExtractorError
 
 from haruhi_dl.playwright import PlaywrightHelper
 
@@ -23,13 +24,17 @@ class TestPlaywright(unittest.TestCase):
             helper._import_pw(fatal=True)
             self.assertIsNotNone(helper._pw)
             self.assertIsInstance(helper._pw_version, compat_str)
-        except ImportError:
+        except ExtractorError:
             self.assertIsNone(helper._pw)
             self.assertIsNone(helper._pw_version)
 
     def test_checking_version(self):
-        version = PlaywrightHelper._version()
+        helper = PlaywrightHelper
-        self.assertIsInstance(version, (compat_str, None))
+        version = helper._version()
+        if helper._pw:
+            self.assertIsInstance(version, compat_str)
+        else:
+            self.assertIsNone(version)
 
 
 if __name__ == '__main__':