### **4.1 Spark Pi**

Test the Spark installation by running the following compute intensive example, which calculates pi by “throwing darts” at a circle. The program generates points in the unit square ((0,0) to (1,1)) and counts how many points fall within the unit circle within the square. The result approximates pi.

   * full range of <a
   * href="https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/util/Formatter.html#syntax">format
   * specifiers</a>, and alert you to usage errors by throwing {@link
   * java.util.IllegalFormatException}.
   *
   * <p>In certain cases, such as outputting debugging information or constructing a message to be

                transport.getRequestSecurityMode(firstReq));
    }

    @Test
    @DisplayName("toString contains key fields without throwing")
    void toStringContainsInfo() {
        String s = transport.toString();
        assertNotNull(s);
        assertTrue(s.contains("state="));
        assertTrue(s.contains(":445"));
    }

   * <code>'&#92;u002D'</code>) is recognized as the minus sign.
   *
   * <p>Unlike {@link Long#parseLong(String)}, this method returns {@code null} instead of throwing
   * an exception if parsing fails. Additionally, this method only accepts ASCII digits, and returns
   * {@code null} if non-ASCII digits are present in the string.
   *

  public void testPuttingTheSameKeyTwiceThrowsOnBuild() {
    Builder<String, Integer> builder =
        new Builder<String, Integer>()
            .put("one", 1)
            .put("one", 1); // throwing on this line would be even better

    IllegalArgumentException expected =
        assertThrows(IllegalArgumentException.class, () -> builder.build());
    assertThat(expected).hasMessageThat().contains("one");
  }

     * specified by the <code>UniAddress</code> parameter. If the credentials are
     * not accepted, an <code>SmbAuthException</code> will be thrown. If an error
     * occurs an <code>SmbException</code> will be thrown. If the credentials are
     * valid, the method will return without throwing an exception. See the
     * last <a href="../../../faq.html">FAQ</a> question.
     * <p>

   *       of a task are ignored.
   * </ol>
   *
   * <p>{@code RuntimeException}s thrown by tasks are simply logged and the executor keeps trucking.
   * If an {@code Error} is thrown, the error will propagate and execution will stop until the next
   * time a task is submitted.
   *
   * <p>When an {@code Error} is thrown by an executed task, previously submitted tasks may never

                // Not called
            }
        }, CrawlingInfoService.class.getCanonicalName());

        // Should log warning and return without throwing exception
        crawlingInfoHelper.updateParams(sessionId, "Test", 1);
    }

    @Test
    public void test_updateParams_storeException() {
        final String sessionId = "store-error-session";

          continue
        }

        if (readBytesDelivered != -1L) {
          return readBytesDelivered
        }

        if (errorExceptionToDeliver != null) {
          // We defer throwing the exception until now so that we can refill the connection
          // flow-control window. This is necessary because we don't transmit window updates until

    }

    @Test
    @DisplayName("Should handle null configuration gracefully")
    void testNullConfiguration() {
        // When - constructor accepts null config without throwing
        Smb2ReadResponse responseWithNull = new Smb2ReadResponse(null, outputBuffer, outputBufferOffset);

        // Then - response is created successfully
        assertNotNull(responseWithNull);
    }