You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: Testing L2 Talk: A Review of Empirical Studies on Second-Language Oral Proficiency Testing 
Chapter Title:  The OPI Compared to other Test Conditions 
1. Abstract of Cited Paper (BIB001):  Abstract This study aims to discuss role-play activity in oral proficiency interviews (OPIs) in terms of its construct validity; that is, whether it correlates with what it is supposed to measure. The data for the analysis were obtained from 71 role-play activities conducted during an OPI. The analysis is based on conversation analytic (CA) methodology and invokes the analytic frameworks of interactive footing and interactional competencies. Conversational analyses performed on the data revealed that candidates executed not only the role-play instructions but also the interviewers’ explicit and implicit requirements of the next desirable action. In doing so, candidates employed and displayed their interactional competencies in role-play interactions. The role-play activity in the OPI being managed by the interviewer created an asymmetrical relationship between the interviewers and the candidates in terms of speaking rights (i.e., turn-taking and topical organization). Nevertheless, competencies that candidates displayed in performing a role-play activity did not seem different from those employed in ordinary conversations. Thus, role-play activity in OPIs, if recognized as an interactional phenomenon co-constructed by participants’ display of their turn-by-turn practical evaluation of each other's actions, seems to be a valid instrument for assessing the candidates’ performance of the given tasks.

Literature Review:
In a second set of studies, the OPI is compared to other test constructs/conditions, such as roleplays (e.g., Halleck 2007; Hüttner 2014; Lorenzo-Dus & Meara 2004) or paired formats BIB001 ).  findings result in a critique of dialogic role-play tasks as valid measures of a candidate's oral proficiency because of the dominant role in constructing the test discourse played by the examiner. Similarly, BIB002 investigates role-plays in high-stake OPIs, concluding that role-plays are not necessarily a better option as compared to OPIs in the sense that the interviewer to a large extent organizes turn-taking as well as topic initiation. However, Okada's study also demonstrates some positive aspects of role-plays; they may offer opportunities for test-takers to display a variety of interactional competencies as well as different discursive identities.