Testing icons

The 45 testing icons in Developer Tools, described

Add runadd-run

A run card with a plus under its play — queue another run in the list.

Assertassert-check

Assert — if this is false, everything stops, an invariant that must hold.

Assert failassert-fail

An X held between brackets — an assertion in the code that failed its check.

Assert passassert-pass

A check held between brackets — an assertion in the code that held true.

Assertionassertion

An assertion — the claim a test makes and expects to hold on every run.

Benchmark runbench-run

A benchmark run — how fast it goes, exactly, timed and measured against a baseline.

Benchmarkbenchmark-code

A code benchmark — how fast it runs, measured fairly and compared.

Coveragecoverage

Test coverage — how much of the code the tests actually touch, as a percentage.

Favourite runfavorite-run

A run card with a heart under its play — a run configuration you keep coming back to.

Filter runfilter-run

A funnel with a play below its stem — run only what the filter selects.

Flaky testflaky-test

A flaky test — one that passes and fails on the same code, unreliable and intermittent.

Fuzzfuzz

Fuzz testing — feed a program random chaos until it confesses a bug.

Generative testgenerative-test

A die showing three — property-based tests that roll random inputs.

Golden filegolden-file

A golden file — the blessed output every run is measured against.

Invariantinvariant

Two equal lines held between brackets — an invariant that must stay true throughout.

Lintlint-run

Lint — the marks under whatever needs fixing, style warnings from a check.

Locked runlocked-run

A padlock with a play on its body — a run that cannot be started without permission.

Mockmock

A mock — a fake that stands in for the real dependency in a test.

Mutant killmutant-kill

A crossed-out mutant — a mutation the test suite caught and killed.

Mutation testmutation-test

A mutation test — break the code on purpose and check that the tests notice.

Postconditionpostcondition

A check placed after the block — a postcondition that must hold once code has run.

Preconditionprecondition

A check placed before the block — a precondition that must hold before code runs.

Property testproperty-test

A property test — many generated inputs against one property that must always hold.

Regression testregression-test

A regression test — proof that the old thing still works after a change.

Run alertrun-alert

A play button beside an alert mark — a run that needs attention.

Run checkpointrun-checkpoint

A run card with a flag under its play — a checkpoint saved partway inside a run.

Run fasterrun-faster

A run card, a double chevron under its play — speed a run up, faster execution.

Run goalrun-goal

A trophy with a play in its bowl — what a run is trying to achieve.

Run historyrun-history

A run card with rows under its play — every run so far, most recent first.

Run idlerun-idle

A run card with a Z under its play — a runner with nothing to do right now.

Run labelrun-label

A label with a play inside — a run with a name attached to it.

Run nextrun-next

A run card with an arrow under its play — start the next run in the queue.

Run trendrun-trend

A run card with a rising line under its play — how runs are trending.

Runnerrunner

A play button inside a box — the runner that executes a job or a test suite.

Safe runsafe-run

A run card with a shield under its play — a run kept inside its guardrails.

Saved runsaved-run

A bookmark with a play inside — a run configuration saved to reuse.

Stubstub-tool

A stub — looks like the tool but does nothing, a hollow stand-in for tests.

Test doubletest-double

A test double — the understudy that takes the stage in place of a real dependency.

End-to-end testtest-e2e

An end-to-end test — the whole user journey checked from start to finish.

Test filetest-file

A page with a play button on it — a test file ready to run in the suite.

Test runtest-run

A test run — the suite is going, tests in progress with results coming in.

Test selecttest-select

Test select — run just the one test that matters right now, not the whole suite.

Test shardtest-shard

A test shard — the suite split several ways so CI finishes sooner.

Unit testtest-unit

A unit test — one small piece of code checked on its own, in isolation.

Variantvariant

A variant — the same thing with one difference, an alternative version.

In code, each is one import — import { AddRun } from "@iconmind/react/icons/add-run" — and the same name in Vue, Svelte, Solid, Preact, React Native, Astro, Blade and Flutter.

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