rec := httptest.NewRecorder()
		switch {
		case !testCase.invalidPartNumber || !testCase.maximumPartNumber:
			// construct HTTP request for copy object.
			req, err = newTestSignedRequestV4(http.MethodPut, getCopyObjectPartURL("", testCase.bucketName, testObject, testCase.uploadID, "1"), 0, nil, testCase.accessKey, testCase.secretKey, nil)
		case testCase.invalidPartNumber:

		Code:           "InvalidArgument",
		Description:    "Argument partNumberMarker must be an integer.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrInvalidPartNumber: {
		Code:           "InvalidPartNumber",
		Description:    "The requested partnumber is not satisfiable",
		HTTPStatusCode: http.StatusRequestedRangeNotSatisfiable,
	},
	ErrInvalidPolicyDocument: {
		Code:           "InvalidPolicyDocument",