{
			name:    "unknown key XAmzMetaName is error as it does not appear in policy",
			fv:      defaultFormVals.Clone().Set(xhttp.AmzMetaName, "my-name"),
			wantErr: `Each form field that you specify in a form must appear in the list of policy conditions. "X-Amz-Meta-Name" not specified in the policy.`,
		},
		{
			name:    "unknown key XAmzChecksumAlgo is error as it does not appear in policy",

	if len(mustFindInPolicy) != 0 {
		logKeys := make([]string, 0, len(mustFindInPolicy))
		for key := range mustFindInPolicy {
			logKeys = append(logKeys, key)
		}
		return fmt.Errorf("Each form field that you specify in a form must appear in the list of policy conditions. %q not specified in the policy.", strings.Join(logKeys, ", "))
	}

	return nil

   * powerSet(ImmutableSet.of(1, 2))} returns the set {@code {{}, {1}, {2}, {1, 2}}}.
   *
   * <p>Elements appear in these subsets in the same iteration order as they appeared in the input
   * set. The order in which these subsets appear in the outer set is undefined. Note that the power
   * set of the empty set is not the empty set, but a one-element set containing the empty set.
   *

  /**
   * Returns an immutable list containing the given elements, sorted according to their natural
   * order. The sorting algorithm used is stable, so elements that compare as equal will stay in the
   * order in which they appear in the input.
   *
   * <p>If your data has no duplicates, or you wish to deduplicate elements, use {@code
   * ImmutableSortedSet.copyOf(elements)}; if you want a {@code List} you can use its {@code
   * asList()} view.

You can define those cases using a list in the type declaration.

You will receive all the values from the duplicate header as a Python `list`.

For example, to declare a header of `X-Token` that can appear more than once, you can write:

{* ../../docs_src/header_params/tutorial003_an_py310.py hl[9] *}

If you communicate with that *path operation* sending two HTTP headers like:

```
X-Token: foo
X-Token: bar
```

      if (placeholderStart == -1) {
        break;
      }
      builder.append(template, templateStart, placeholderStart);
      builder.append(lenientToString(args[i++]));
      templateStart = placeholderStart + 2;
    }
    builder.append(template, templateStart, template.length());

    // if we run out of placeholders, append the extra args in square brackets
    if (i < args.length) {
      String prefix = " [";

            assertTrue(result.contains("Transport failed"));
            assertTrue(result.contains("IllegalStateException"));
            assertTrue(result.contains("Outer exception"));
            // The nested exceptions will appear in the stack trace
            assertTrue(result.contains("Caused by"));
        }

        @Test
        @DisplayName("Should handle exception with empty message")
        void testToStringWithEmptyMessage() {

        // Only set up parent mocks when they're actually needed for URL creation
        when(parent.getContext()).thenReturn(this.ctx);
        when(parent.getLocator()).thenReturn(parentLocator);
        // Make the parent appear as a workgroup to use the simpler URL code-path
        when(parentLocator.isWorkgroup()).thenReturn(true);
    }

    /** Simple implementation of FileEntry for controlled inputs in tests. */

   * calling the function on that value. The resulting multimap is created as an immutable snapshot.
   * In the returned multimap, keys appear in the order they are first encountered, and the values
   * corresponding to each key appear in the same order as they are encountered.
   *
   * <p><b>{@code Stream} equivalent:</b> {@code stream.collect(Collectors.groupingBy(keyFunction))}

   * calling the function on that value. The resulting multimap is created as an immutable snapshot.
   * In the returned multimap, keys appear in the order they are first encountered, and the values
   * corresponding to each key appear in the same order as they are encountered.
   *
   * <p><b>{@code Stream} equivalent:</b> {@code stream.collect(Collectors.groupingBy(keyFunction))}