Step 1: Concept Summary:
The question outlines a marriage custom where the groom resides with the bride's family before marriage, with consequences if the marriage is called off.
Step 2: Detailed Analysis:
- Probationary marriage: The groom lives with the bride's family for evaluation, a "probation" period. His character and suitability are assessed. This "marriage by service" includes a penalty for non-completion, signifying a formal, binding arrangement under evaluation. This fits the description precisely.
- Trial marriage: A less formal cohabitation to assess compatibility, lacking the bride's parents' evaluation and formal compensation.
- Marriage by capture: Bride abduction; unrelated to the scenario.
- Marriage by purchase: Payment of a bride price; the described scenario involves service and potential compensation, not a direct purchase.
Step 3: Conclusion:
The arrangement featuring groom testing via residence with the bride's family and a failure penalty is accurately termed a probationary marriage.