Exhibit 12(a)


                  Executive Officers' Certification Pursuant to
                      Section 302 of the Sarbanes-Oxley Act

     I, Jason C.S. Chang, the Chief Executive Officer of ASE Test Limited,
certify that:

     1. I have reviewed this annual report on Form 20-F of ASE Test Limited;

     2. Based on my knowledge, this annual report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this annual
report;

     3. Based on my knowledge, the financial statements and other financial
information included in this annual report fairly present in all material
respects the financial condition, results of operations and cash flows of the
company as of, and for, the periods presented in this annual report;

     4. The company's other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) for the company and we have:

     a)   designed such disclosure controls and procedures, or caused such
          disclosure controls and procedures to be designed under our
          supervision, to ensure that material information relating to the
          company, including its consolidated subsidiaries, is made known to us
          by others within those entities, particularly during the period in
          which this annual report is being prepared;

     b)   [Reserved]

     c)   evaluated the effectiveness of the company's disclosure controls and
          procedures and presented in this report our conclusions about the
          effectiveness of the disclosure controls and procedures, as of the end
          of the period covered by this report based on such evaluation; and

     d)   disclosed in this report any change in the company's internal control
          over financial reporting that occurred during the period covered by
          the annual report that has materially affected, or is


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          reasonably likely to materially affect, the company's internal control
          over financial reporting;

     5. The company's other certifying officer and I have disclosed, based on
our most recent evaluation of internal control over financial reporting, to the
company's auditors and the audit committee of the company's board of directors
(or persons performing the equivalent functions):

     a)   all significant deficiencies and material weaknesses in the design or
          operation of internal control over financial reporting which are
          reasonably likely to adversely affect the company's ability to record,
          process, summarize and report financial information; and

     b)   any fraud, whether or not material, that involves management or other
          employees who have a significant role in the company's internal
          control over financial reporting.

Date: June 23, 2005




                                       /s/ Jason C.S. Chang
                                    -------------------------------
                                    Name: Jason C.S. Chang
                                    Title: Chief Executive Officer

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