Object toBeSupplied = new Object();
    Supplier<Object> objectSupplier = Suppliers.ofInstance(toBeSupplied);
    assertSame(toBeSupplied, objectSupplier.get());
    assertSame(toBeSupplied, objectSupplier.get()); // idempotent
  }

  public void testOfInstanceSuppliesNull() {
    Supplier<@Nullable Integer> nullSupplier = Suppliers.ofInstance(null);
    assertThat(nullSupplier.get()).isNull();
  }

  @J2ktIncompatible

            assertTrue(e instanceof IOException);
            assertTrue(e.getMessage().contains("endpoint is blank"));
        }
    }

    /**
     * Test that connect() is idempotent - calling it multiple times should be safe.
     */
    public void test_connect_idempotent() throws Exception {
        URL url = new URL("storage://mybucket/object.txt");
        Handler handler = new Handler();

    assertThat(partEfg.headers).isEqualTo(headersOf("Content-ID", "efg"))
    assertThat(partEfg.body.readUtf8()).isEqualTo("efgh")

    assertThat(parts.nextPart()).isNull()
  }

  @Test fun `no more parts is idempotent`() {
    val multipart =
      """
      |--simple boundary
      |
      |abcd
      |--simple boundary--
      |
      |efgh
      |--simple boundary--
      """.trimMargin()

        assertEquals("working", result);

        // Close it
        cbToClose.close();

        // Should not throw exception (close should be idempotent)
        cbToClose.close();
    }

    @Test
    public void testEnhancedMetricsTracking() throws Exception {
        SmbCircuitBreaker cbWithEnhanced = new SmbCircuitBreaker("enhanced-test");

     * `ID > lastGoodStreamId` on a new connection.  In- flight streams with
     * `ID <= lastGoodStreamId` can only be replayed on a new connection if they are idempotent.
     *
     * @param lastGoodStreamId the last stream ID the peer processed before sending this message. If
     *     [lastGoodStreamId] is zero, the peer processed no frames.

        // First close
        closeableFactory.destroyObject(pooledObject);
        assertTrue(component.isClosed());

        // Component's close is idempotent, so calling destroy again should not increment counter
        closeableFactory.destroyObject(pooledObject);
        assertEquals(1, CloseableTestComponent.getCloseCount());
    }

    /**

      int value = random.nextInt();
      HashCode hashcode1 = hashFunction.hashInt(value);
      HashCode hashcode2 = hashFunction.hashInt(value);
      Assert.assertEquals(hashcode1, hashcode2); // idempotent
      Assert.assertEquals(hashFunction.bits(), hashcode1.bits());
      Assert.assertEquals(hashFunction.bits(), hashcode1.asBytes().length * 8);
      hashcodes.add(hashcode1);
    }

      int value = random.nextInt();
      HashCode hashcode1 = hashFunction.hashInt(value);
      HashCode hashcode2 = hashFunction.hashInt(value);
      Assert.assertEquals(hashcode1, hashcode2); // idempotent
      Assert.assertEquals(hashFunction.bits(), hashcode1.bits());
      Assert.assertEquals(hashFunction.bits(), hashcode1.asBytes().length * 8);
      hashcodes.add(hashcode1);
    }

 *  New: Support for SOCKS proxies.
 *  New: Support for `TLS_FALLBACK_SCSV`.
 *  New: Update HTTP/2 support to `h2-16` and `hpack-10`.
 *  New: APIs to prevent retrying non-idempotent requests.
 *  Fix: Drop NPN support. Going forward we support ALPN only.
 *  Fix: The hostname verifier is now strict. This is consistent with the hostname
    verifier in modern browsers.

        assertFalse(context.isClosed());

        // When
        context.close();

        // Then
        assertTrue(context.isClosed());

        // Should be idempotent
        assertDoesNotThrow(() -> context.close());

        // Cleanup
        keyManager.close();
    }

    @Test
    @DisplayName("Should rotate keys successfully")