Research has revealed that teachers' thinking processes highly influence their instructional and evaluative behaviors. Understanding teachers' beliefs and theoretical orientations about reading are more than necessary to rethink reading instruction and assessment. The present paper reviews a case study conducted at the Department of English, Tlemcen University, Algeria. The study looked at teachers' beliefs and theoretical orientations regarding reading assessment and its effect on EFL learners' comprehension ability. It examines the correspondence between reading teachers' theoretical orientations and classroom reading assessment. This study included 20 teachers and 120 students. Data collection procedures included questionnaires and classroom observations. Data analysis exposed the congruence between teachers' beliefs about reading and classroom reading assessment. Moreover, standardized classroom reading assessment negatively impacted learners' comprehension ability and reading motivation. The discussions underscored the importance of alternative reading assessment methods such as portfolios, which represent genuine and effective language learning strategies according to modern research.