case studies
Selectivity Finds the Two CSV Records Behind a Calculation Bug
A CSV importer can be wrong for a reason that disappears when a developer tests one record at a time. The example here needs a sequence: a discount for an order, followed …
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Case Studies
case studies
Selectivity Isolates Numeric Precision Loss in JSON Lines
An input can be perfectly valid and still expose a disagreement between two consumers. In this example, one path keeps an integer identifier exactly as parsed. The other …
case studies
Selectivity Keeps a Useful Checkpoint When the Test Budget Runs Out
A reduction can be useful before it is finished. That matters when the predicate is expensive, a CI job has a fixed allowance, or a developer wants to make a first pass …
case studies
Selectivity Reduces a Configuration Bundle by Files and Lines
The directory demonstration asks a slightly different question from the single-file example: can the reducer find both the relevant files and the relevant lines within …
case studies
Selectivity Reduces a Generated File From 20000 Lines to Two
The line-reduction demonstration starts with a deliberately oversized text file whose answer is known in advance. It has 20000 lines: alpha appears on line 702, omega on …