Many Chinese universities are implementing an educational reform to transform their general English courses into academic English courses. Accordingly, how to assess students' English ability should also be reformed. In this test review, we introduce a school-based general academic English summative test developed by English instructors. An argument-based approach was adopted to analyze the test validity by obtaining students' test data and their reflective responses to the test. This review can provide a practical reference for the development of a valid general academic English summative test by including practices of course instructors and voices of students, two important test stakeholders, in test design.