Fix exception causes in config/__init__.py

Author: cool-RR

src/_pytest/config/__init__.py

@@ -641,7 +641,7 @@ def import_plugin(self, modname: str, consider_entry_points: bool = False) -> No
         except ImportError as e:
             raise ImportError(
                 'Error importing plugin "{}": {}'.format(modname, str(e.args[0]))
-            ).with_traceback(e.__traceback__)
+            ).with_traceback(e.__traceback__) from e
 
         except Skipped as e:
             from _pytest.warnings import _issue_warning_captured
@@ -1130,8 +1130,8 @@ def getini(self, name: str):
     def _getini(self, name: str) -> Any:
         try:
             description, type, default = self._parser._inidict[name]
-        except KeyError:
-            raise ValueError("unknown configuration value: {!r}".format(name))
+        except KeyError as e:
+            raise ValueError("unknown configuration value: {!r}".format(name)) from e
         override_value = self._get_override_ini_value(name)
         if override_value is None:
             try:
@@ -1197,12 +1197,12 @@ def _get_override_ini_value(self, name: str) -> Optional[str]:
         for ini_config in self._override_ini:
             try:
                 key, user_ini_value = ini_config.split("=", 1)
-            except ValueError:
+            except ValueError as e:
                 raise UsageError(
                     "-o/--override-ini expects option=value style (got: {!r}).".format(
                         ini_config
                     )
-                )
+                ) from e
             else:
                 if key == name:
                     value = user_ini_value
@@ -1223,14 +1223,14 @@ def getoption(self, name: str, default=notset, skip: bool = False):
             if val is None and skip:
                 raise AttributeError(name)
             return val
-        except AttributeError:
+        except AttributeError as e:
             if default is not notset:
                 return default
             if skip:
                 import pytest
 
                 pytest.skip("no {!r} option found".format(name))
-            raise ValueError("no option named {!r}".format(name))
+            raise ValueError("no option named {!r}".format(name)) from e
 
     def getvalue(self, name, path=None):
         """ (deprecated, use getoption()) """