// generating a valid credential field.
					generateCredentialStr(
						"Z7IXGOO6BZ0REAN1Q26I",
						sampleTimeStr,
						"us-west-1",
						"s3",
						"aws4_request"),
					// Incorrect SignedHeader field.
					"SignIncorrectHeader=",
					"b",
				}, ","),

			expectedAuthField: signValues{},
			expectedErrCode:   ErrMissingSignHeadersTag,
		},
		// Test case - 6.

			accessKey:            credentials.AccessKey,
			secretKey:            credentials.SecretKey,
			expectedRespStatus:   http.StatusPreconditionFailed,
		},
		// Test case - 17, copy metadata from newObject1 with incorrect unmodified header format.
		17: {
			bucketName:           bucketName,
			newObjectName:        "newObject1",
			copySourceHeader:     url.QueryEscape(SlashSeparator + bucketName + SlashSeparator + objectName),