if (num >= 0) {
      Object[] rest = new Integer[num];
      for (int i = 0; i < num; i++) {
        rest[i] = partsArray[i + 2];
      }

      assertEquals(expected, joiner.join(partsArray[0], partsArray[1], rest));

      StringBuilder sb3 = new StringBuilder().append('x');
      joiner.appendTo(sb3, partsArray[0], partsArray[1], rest);
      assertEquals("x" + expected, sb3.toString());
    }

        log.debug("Test setup completed");
    }

    @AfterEach
    void cleanupTest() throws Exception {
        // Simple cleanup between tests
        try {
            System.gc();
            Thread.sleep(100);
            log.debug("Test cleanup completed");
        } catch (Exception e) {
            log.warn("Failed to cleanup test", e);
        }
    }

 * the updated response if it has changed, or a short 'not modified' response if the client's copy
 * is still valid. Such responses increment both the network count and hit count.
 *
 * The best way to improve the cache hit rate is by configuring the web server to return cacheable
 * responses. Although this client honors all [HTTP/1.1 (RFC 7234)][rfc_7234] cache headers, it
 * doesn't cache partial responses.
 *

 *
 * <p>The tested methods and constructors are invoked -- each time with one parameter being null and
 * the rest not null -- and the test fails if no expected exception is thrown. {@code
 * NullPointerTester} uses best effort to pick non-null default values for many common JDK and Guava
 * types, and also for interfaces and public classes that have public parameter-less constructors.

    return LoadBalancingStrategy.valueOf(strategy.toUpperCase());
}
```

## 7. Testing Strategy

### 7.1 Unit Tests
```java
@Test
public void testChannelSelection() {
    ChannelManager manager = new ChannelManager(context, session);
    
    // Add test channels
    ChannelInfo channel1 = createTestChannel("channel1", 1000);  // 1Gbps
    ChannelInfo channel2 = createTestChannel("channel2", 10000); // 10Gbps

      }
    }.test();
  }

  @GwtIncompatible // slow (~30s)
  public void testIterator_general() {
    new IteratorTester<String>(
        5, UNMODIFIABLE, asList("a", "b", "c"), IteratorTester.KnownOrder.KNOWN_ORDER) {
      @Override
      protected Iterator<String> newTargetIterator() {
        return of("a", "b", "c").iterator();
      }
    }.test();
  }

                .addAll(curr)
                .build());
      }
    }
    return allOverloads.build().asList();
  }

  // 'test' to demonstrate some potentially ambiguous overloads.  This 'test' is kind of strange,
  // but essentially each line will be a call to a Preconditions method that, but for a documented
  // change would be a compiler error.

                .addAll(curr)
                .build());
      }
    }
    return allOverloads.build().asList();
  }

  // 'test' to demonstrate some potentially ambiguous overloads.  This 'test' is kind of strange,
  // but essentially each line will be a call to a Preconditions method that, but for a documented
  // change would be a compiler error.

## Version 4.7.0

_2020-05-17_

 *  New: `HandshakeCertificates.Builder.addInsecureHost()` makes it easy to turn off security in
    private development environments that only carry test data. Prefer this over creating an
    all-trusting `TrustManager` because only hosts on the allowlist are insecure. From
    [our DevServer sample][dev_server]:

    ```kotlin

        assertDoesNotThrow(() -> InputValidator.validateBufferSize(0, 1000, "test"));
        assertDoesNotThrow(() -> InputValidator.validateBufferSize(1000, 1000, "test"));
    }

    @Test
    @DisplayName("Test invalid buffer size validation")
    void testInvalidBufferSize() {
        assertThrows(IllegalArgumentException.class, () -> InputValidator.validateBufferSize(-1, 1000, "test"));