How do you troubleshoot unexpected Groovy Truth evaluation in conditionals?

Start by identifying the actual runtime type and value of the expression being evaluated in the conditional - Groovy Truth rules differ meaningfully by type, empty String, empty Collection, and zero-valued Number are all falsy, but a non-null object with no special truthiness rule defined is simply true regardless of its internal state, so "why is this true or false" often comes down to which type-specific rule actually applied.

A frequent surprise is a custom object being unexpectedly treated as true even when it seems "empty" in some domain sense - unless that class implements asBoolean() to define custom truthiness, Groovy Truth for arbitrary objects defaults to true whenever the reference is simply non-null, regardless of the object's internal state.

To fix genuinely unexpected behavior, either implement asBoolean() on the class to define what "truthy" specifically means for it, or make the conditional's intent explicit by checking the specific condition directly, like list.isEmpty() or someValue != null, instead of relying on the implicit Groovy Truth conversion, especially in code where the exact falsy/truthy rule matters and shouldn't be left implicit.

When debugging, it also helps to explicitly convert the value to a boolean in isolation to directly observe what Groovy Truth resolves it to, rather than inferring it indirectly from the conditional's overall behavior in a larger, more complex expression.