Fix PyLint: Consider explicitly re-raising

platformio/test/runners/base.py

@@ -128,11 +128,11 @@ class TestRunnerBase:
             targets.append("checkprogsize")
         try:
             return self.run_project_targets(targets)
-        except ReturnErrorCode:
+        except ReturnErrorCode as exc:
             raise UnitTestSuiteError(
                 "Building stage has failed, see errors above. "
                 "Use `pio test -vvv` option to enable verbose output."
-            )
+            ) from exc
 
     def stage_uploading(self):
         is_embedded = self.platform.is_embedded()
@@ -150,11 +150,11 @@ class TestRunnerBase:
             targets.append("__debug")
         try:
             return self.run_project_targets(targets)
-        except ReturnErrorCode:
+        except ReturnErrorCode as exc:
             raise UnitTestSuiteError(
                 "Uploading stage has failed, see errors above. "
                 "Use `pio test -vvv` option to enable verbose output."
-            )
+            ) from exc
 
     def stage_testing(self):
         if self.options.without_testing:

platformio/test/runners/factory.py

@@ -56,11 +56,11 @@ class TestRunnerFactory(object):
 
             try:
                 mod = load_python_module(module_name, custom_runner_path)
-            except (FileNotFoundError, ImportError):
+            except (FileNotFoundError, ImportError) as exc:
                 raise UserSideException(
                     "Could not find custom test runner "
                     f"by this path -> {custom_runner_path}"
-                )
+                ) from exc
         else:
             mod = importlib.import_module(module_name)
         runner_cls = getattr(mod, cls.get_clsname(test_framework))

platformio/test/runners/readers/program.py

@@ -108,8 +108,8 @@ class ProgramTestOutputReader:
             raise UnitTestError(
                 f"Program received signal {sig.name} ({signal_description})"
             )
-        except ValueError:
-            raise UnitTestError("Program errored with %d code" % return_code)
+        except ValueError as exc:
+            raise UnitTestError("Program errored with %d code" % return_code) from exc
 
     def begin(self):
         try:

platformio/test/runners/readers/serial.py

@@ -45,8 +45,8 @@ class SerialTestOutputReader:
             ser.rts = self.test_runner.options.monitor_rts
             ser.dtr = self.test_runner.options.monitor_dtr
             ser.open()
-        except serial.SerialException as e:
-            click.secho(str(e), fg="red", err=True)
+        except serial.SerialException as exc:
+            click.secho(str(exc), fg="red", err=True)
             return None
 
         if not self.test_runner.options.no_reset: