Rules

Set a rule to off, warning or error in configuration or with --rule <id>=<severity>.

Rule	Default	Meaning
duplicate-test	Error	Two tests have the same normalized body under an equivalent context.
duplicate-test-name	Warning	Two tests in one file share a full title.
parameterization-candidate	Warning	Two tests have the same structure and differ only in literal values.
near-duplicate-test	Warning	Two tests perform the same behavior under an equivalent context, but their normalized bodies differ.
cross-file-duplicate	Warning	The duplicate-test criteria without the single-file restriction.
subsumed-test	Off	One test’s behavior is a strict ordered subsequence of another’s. Off by default: its findings are frequently distinct tests rather than redundant ones.
duplicate-suite	Warning	A whole describe block is duplicated within one file, reported once instead of per test.
duplicate-each-row	Warning	Two rows of one parameterized test, benchmark, or suite carry the same case.
redundant-hook	Warning	A nested lifecycle hook repeats work an ancestor hook already performs.

Verdicts

Each finding carries a verdict naming its remedy, because the remedies differ.

• Redundant: one copy can go. duplicate-test, cross-file-duplicate, duplicate-suite, duplicate-each-row, redundant-hook.
• Consolidatable: every case is needed, and they belong in one test.each table. parameterization-candidate. Deleting a row here would lose coverage.
• A review prompt: near-duplicate-test and subsumed-test flag tests that look equivalent without establishing that either adds no coverage. Review decides, and for near-duplicate-test the usual outcome is consolidation into one test.each table.

cross-file-duplicate reports at Warning rather than Error because duplication across unit and integration layers is sometimes deliberate.

Local classes and constructors

Tests that construct local classes are compared by what the classes do rather than by what they are called, except that names a test observes still count. The rules for what counts as the same, and when a test is left out of comparison, are on Local classes and constructors.

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