return target.getClass().getSimpleName() + "[" + target.getMessage() + "]";
        }
        final StringBuilder sb = new StringBuilder();
        while (target != null) {
            sb.append(target.getClass().getSimpleName());
            if (target.getMessage() != null) {
                sb.append("[");
                sb.append(target.getMessage());
                sb.append("]");
            }

        } catch (JobProcessingException e) {
            assertEquals("Python Process terminated.", e.getMessage());
            assertNotNull(e.getCause());
            // Check cause message if available, otherwise just verify cause exists
            if (e.getCause().getMessage() != null) {
                assertTrue(e.getCause().getMessage().contains("Process start failed"));
            }
        }
    }

        final NullArgumentException nullArgumentException = new NullArgumentException("hoge");
        assertThat(nullArgumentException.getArgName(), is("hoge"));
        assertThat(nullArgumentException.getMessage(), is("[ECL0008]argument[hoge] is null."));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testErrorMessage_en() throws Exception {
        // ## Arrange ##

     * .
     */
    @Test
    public void testSIllegalStateExceptionString() {
        final ClIllegalStateException clIllegalStateException = new ClIllegalStateException("hoge");
        assertThat(clIllegalStateException.getMessage(), is("hoge"));
    }

    /**
     * Test method for
     * {@link org.codelibs.core.exception.ClIllegalStateException#SIllegalStateException(java.lang.String, java.lang.Throwable)}
     * .
     */
    @Test

          "the hash (1) of TestObject{group=1, item=1} [group 1, item 1] must be "
              + "equal to the hash (2) of TestObject{group=1, item=2} [group 1, item 2]";
      if (!expected.getMessage().contains(expectedMessage)) {
        fail("<" + expected.getMessage() + "> expected to contain <" + expectedMessage + ">");
      }
      return;
    }
    fail();
  }

  /** An object with a friendly {@link #toString()}. */

          "the hash (1) of TestObject{group=1, item=1} [group 1, item 1] must be "
              + "equal to the hash (2) of TestObject{group=1, item=2} [group 1, item 2]";
      if (!expected.getMessage().contains(expectedMessage)) {
        fail("<" + expected.getMessage() + "> expected to contain <" + expectedMessage + ">");
      }
      return;
    }
    fail();
  }

  /** An object with a friendly {@link #toString()}. */

        assertEquals("Runtime error", runtimeEx.getMessage());

        // Test Exception
        Exception generalEx = new Exception("General error");
        assertEquals("General error", generalEx.getMessage());

        // Test with null message
        RuntimeException nullMessageEx = new RuntimeException();
        assertNull(nullMessageEx.getMessage());

        // Test with empty message

            provider.provide(null);
            fail("Should throw exception for null classification name");
        } catch (ProvidedClassificationNotFoundException e) {
            // expected
            assertTrue(e.getMessage().contains("Not found the classification: null"));
        } catch (NullPointerException e) {
            // Also acceptable if null is not handled explicitly
        }
    }

        try {
            jobHelper.register((ScheduledJob) null);
            fail("Should throw ScheduledJobException");
        } catch (ScheduledJobException e) {
            assertEquals("No job.", e.getMessage());
        } catch (Exception e) {
            // Expected due to missing dependencies in test environment
            assertTrue(true);
        }
    }

        // If logging fails, e.g. due to missing memory, at least try to log the
        // message and the cause for the failed logging.
        System.err.println(e.getMessage());
        System.err.println(errorInLogging.getMessage());
      } finally {
        runtime.exit(1);
      }
    }
  }