Cucumber-JVM and JUnit: Parameter Type Resolution Ambiguity
0 reputation · 28 Sept 2022, 17:50 UTC
Custom Parameter Type Conflict
Cucumber Expressions provide a mechanism to map step arguments to Java method arguments via the ParameterTypeRegistry. This allows for domain-specific parsing that replaces traditional regular expressions.
When integrating Cucumber-JVM with JUnit, developers may register multiple custom parameter types. A technical uncertainty arises when a single argument string satisfies the patterns of two or more registered parameter types.
Current implementation suggests that the registry selects the first registered type, but this behavior lacks formal documentation and may lead to non-deterministic step resolution in large-scale test suites.
Integration Constraints
- Requirement for deterministic mapping of Gherkin strings to Java objects.
- Reliance on the
Cucumber-JUnitrunner for execution lifecycle.
What is the documented priority logic for resolving ambiguous parameter types when multiple patterns match the same input? Is there a mechanism to explicitly define precedence for overlapping types?
junit
cucumber