* to set the result of the computation through the protected methods {@link #set(Object)}, {@link
 * #setFuture(ListenableFuture)} and {@link #setException(Throwable)}. Subclasses may also override
 * {@link #afterDone()}, which will be invoked automatically when the future completes. Subclasses
 * should rarely override other methods.
 *
 * @author Sven Mawson

		// Test case - 5.
		// Enabling PreSigned Signature v4, but X-Amz-Content-Sha256 set and its not UNSIGNED-PAYLOAD, we shouldn't skip.
		{"X-Amz-Content-Sha256", "somevalue", "X-Amz-Credential", "", false},

		// Test case - 6.
		// Test case with "X-Amz-Content-Sha256" header set to  "UNSIGNED-PAYLOAD" and its not presigned, we should skip.
		{"X-Amz-Content-Sha256", unsignedPayload, "", "", true},

		// Test case - 7.

  public void testNullPointers() {
    /*
     * Don't bother testing: Preconditions defines a bunch of methods that accept a template (or
     * even entire message) that simultaneously:
     *
     * - _shouldn't_ be null, so we don't annotate it with @Nullable
     *
     * - _can_ be null without causing a runtime failure (because we don't want the interesting

  internal var errorException: IOException? = null

  init {
    if (headers != null) {
      check(!isLocallyInitiated) { "locally-initiated streams shouldn't have headers yet" }
      headersQueue += headers
    } else {
      check(isLocallyInitiated) { "remotely-initiated streams should have headers" }
    }
  }

  /**
   * Returns true if this stream is open. A stream is open until either:
   *

	}

	// RelationModel3 should be existed
	_, err = findColumnType(&RelationModel3{}, "id")
	AssertEqual(t, nil, err)

	// RelationModel1 should not be existed
	_, err = findColumnType(&RelationModel1{}, "id")
	if err == nil {
		t.Errorf("RelationModel1 should not be migrated")
	}

	// RelationModel2 should not be existed
	_, err = findColumnType(&RelationModel2{}, "id")

    assertFalse(
        from.getType() + " shouldn't be assignable to " + to.getType(), to.isSupertypeOf(from));
    assertFalse(
        to.getType() + " shouldn't be a supertype of " + from.getType(), to.isSupertypeOf(from));
    assertFalse(
        from.getType() + " shouldn't be a subtype of " + to.getType(), from.isSubtypeOf(to));
  }

### Always `raise` in Dependencies with `yield` and `except`

If you catch an exception in a dependency with `yield`, unless you are raising another `HTTPException` or similar, you should re-raise the original exception.

    assertThat(synStream.streamId).isEqualTo(3)
    assertThat(synStream.associatedStreamId).isEqualTo(-1)
    assertThat(synStream.headerBlock).isEqualTo(headerEntries("a", "artichaut"))
  }

  /** A server RST_STREAM shouldn't prevent the client from consuming the response body.  */
  @Test fun serverResponseBodyRstStream() {
    // Write the mocking script.
    peer.sendFrame().settings(Settings())
    peer.acceptFrame() // ACK

    ```

=== "Python 3.8+"

    ```Python hl_lines="14"
    {!> ../../../docs_src/body_nested_models/tutorial002.py!}
    ```

## Set types

But then we think about it, and realize that tags shouldn't repeat, they would probably be unique strings.

And Python has a special data type for sets of unique items, the `set`.

Then we can declare `tags` as a set of strings:

=== "Python 3.10+"

		}

	}

	// Test for Anonymous/unsigned http request.
	// ListBucketsHandler doesn't support bucket policies, setting the policies shouldn't make any difference.
	anonReq, err := newTestRequest(http.MethodGet, getBucketLocationURL("", bucketName), 0, nil)
	if err != nil {
		t.Fatalf("MinIO %s: Failed to create an anonymous request.", instanceType)
	}