For example the following shipping fields of One order document are stored in Database table CRMD_SHIPPING.
The data could be read out via function module CRM_SHIPPING_READ_OB.
This blog introduces the step how to generate fake data which will be returned by function module CRM_SHIPPING_READ_OB for unit test purpose.
Step1. Create fake data in Shipping object buffer
DATA: ls_shipping TYPE crmt_shipping_wrk.
DATA: lv_order_guid TYPE crmt_object_guid,
      lv_ship_guid  LIKE lv_order_guid,
      lt_link_com   TYPE crmt_link_comt,
      ls_link_com   LIKE LINE OF lt_link_com.

CALL FUNCTION 'GUID_CREATE'
  IMPORTING
    ev_guid_16 = lv_order_guid.
CALL FUNCTION 'GUID_CREATE'
  IMPORTING
    ev_guid_16 = lv_ship_guid.
ls_shipping-incoterms1 = 'FOB'.
ls_shipping-incoterms2 = 'Jerry Fake incoterms'.
ls_shipping-guid = lv_ship_guid.

CALL FUNCTION 'CRM_SHIPPING_PUT_OB'
  EXPORTING
    is_shipping_wrk = ls_shipping.
Step2. Create a link between Order and shipping data via function module CRM_LINK_CREATE_OW
ls_link_com-guid_hi     = lv_order_guid.
ls_link_com-guid_set    = lv_ship_guid.
ls_link_com-objname_set = 'SHIPPING'.
ls_link_com-objtype_set = '12'.
ls_link_com-objname_hi  = 'ORDERADM_H'.
ls_link_com-objtype_hi  = '05'.

INSERT ls_link_com INTO TABLE lt_link_com.
CALL FUNCTION 'CRM_LINK_CREATE_OW'
  EXPORTING
    iv_guid_hi = lv_order_guid
    it_link    = lt_link_com
  EXCEPTIONS
    OTHERS     = 0.
Step3. perform read via Object buffer function call
CLEAR: ls_shipping.

CALL FUNCTION 'CRM_SHIPPING_READ_OB'
  EXPORTING
    iv_ref_guid         = lv_order_guid
    iv_ref_kind         = 'A'
  IMPORTING
    es_shipping_wrk = ls_shipping.

WRITE:/ 'Incoterms1:', ls_shipping-incoterms1.
WRITE:/ 'Incoterms2:', ls_shipping-incoterms2.
Callstack of link manipulation and object buffer insert and read for Shipping.
execution result:
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