void testCapacityEdgeValues(long capacity) {
        when(mockAllocInfo.getCapacity()).thenReturn(capacity);
        assertEquals(capacity, mockAllocInfo.getCapacity());
    }

    /**
     * Null pointer scenario – calls on a null reference should raise
     * {@link NullPointerException}. This test is defensive; in real code it
     * would likely be handled elsewhere.
     */
    @Test

#### Blocking APIs

Blocking APIs are convenient because you get top-to-bottom procedural code without indirection. Network calls work like regular method calls: ask for data and it is returned. If the request fails, you get a stacktrace right where the call was made.

    }

    @Test
    @DisplayName("getInput and getOutput throw after close")
    void testGetInputOutputAndClosed() throws CIFSException {
        // After closing the handle, further calls throw
        target.close();
        CIFSException e1 = assertThrows(SmbException.class, target::getInput);
        assertTrue(e1.getMessage().contains("Already closed"));

import org.junit.Ignore;

/**
 * Common superclass for {@link MultisetSetCountUnconditionallyTester} and {@link
 * MultisetSetCountConditionallyTester}. It is used by those testers to test calls to the
 * unconditional {@code setCount()} method and calls to the conditional {@code setCount()} method
 * when the expected present count is correct.
 *
 * @author Chris Povirk
 */
@GwtCompatible

        toRemove = mapEntry;
        return mapEntry.getKey();
      }

      @Override
      public void remove() {
        checkState(toRemove != null, "no calls to next() since the last call to remove()");
        size -= toRemove.getValue().getAndSet(0);
        backingEntries.remove();
        toRemove = null;
      }
    };
  }

  @Override

    }

    @Test
    public void testMultipleCompressionCalls() {
        CurlRequest request = new CurlRequest(Method.GET, "https://example.com");

        // Multiple compression calls should work
        request.compression("gzip");
        request.compression("deflate");

        assertNotNull(request);
    }

    @Test
    public void testEmptyStringParam() {

            // Then
            assertEquals(0, opnum, "Opnum should always be 0 for bind messages");
        }

        @Test
        @DisplayName("getOpnum should be consistent across multiple calls")
        void testGetOpnumConsistency() {
            // When
            int opnum1 = bind.getOpnum();
            int opnum2 = bind.getOpnum();
            int opnum3 = bind.getOpnum();

            // Then

        assertTrue(ntlmConnection.getInstanceFollowRedirects());
        assertEquals("application/json", ntlmConnection.getRequestProperty("Accept"));
    }

    /**
     * Test that connect() calls connect() on the underlying connection.
     * @throws IOException
     */
    @Test
    void testConnect() throws Exception {
        // Act
        ntlmConnection.connect();

        // Assert

configured to fall back for broad connectivity.

Using OkHttp is easy. Its request/response API is designed with fluent builders and immutability. It
supports both synchronous blocking calls and async calls with callbacks.

A well behaved user agent
-------------------------

OkHttp follows modern HTTP specifications such as

* HTTP Semantics - [RFC 9110](https://datatracker.ietf.org/doc/html/rfc9110)

The process that happens when your API app calls the *external API* is named a "callback". Because the software that the external developer wrote sends a request to your API and then your API *calls back*, sending a request to an *external API* (that was probably created by the same developer).