Live Test Runner
Save a file. Tests run. Results appear inline. No terminal. No config.
Only supports
Jestat the moment
What you get
| Feature | ||
|---|---|---|
| ⚡ | Live reruns on save — targeted, file or test level | |
| 🌳 | Test tree in the sidebar — file → suite → test, instant on open | |
| 🎨 | Editor decorations — gutter icons, inline duration, CodeLens buttons | |
| 📊 | Per-line code coverage — coloured bars + hover shows which tests hit each line | |
| 🔍 | Results panel — 3-column view: test list · console output · errors | |
| ⏱ | Timeline Debugger (coming soon) — step through a test like a time-travel debugger |
Quick Start
- Open a Jest project in VS Code
- Click the beaker icon in the Activity Bar
- Click ▶ Start Testing
- Save any file — results update instantly
No
jest.configchanges. No extra installs.
Features
Test tree & always-on watching
Your full suite — every file, suite, and test — appears in the sidebar on project open before any run. Tests rerun on every save. The status bar shows a live pass/fail count.
Editor decorations & CodeLens
Every it() / test() line gets a gutter icon, inline duration, and action buttons:
- ✓ / ✗ / ⟳ / ○ gutter icons — live from project open
▶ Run·▷ Debug·◈ ResultsCodeLens above each block- Inline duration label, color-coded by threshold
Live code coverage
After the first run, every source file shows per-line coverage — no separate command needed.
| Bar | Meaning |
|---|---|
Green ▌ |
Covered by all tests |
Amber ▌ |
Covered by some tests |
Red ▌ |
Never executed |
Grey ▌ |
Not executable |
Hover any line to see which tests cover it, their pass/fail status, and duration. When more than 5 tests cover a line, click Show all N to open a searchable Quick Pick listing every covering test — select one to jump to its result. Coverage updates on every save; files show a grey overlay while a rerun is in progress.
Results panel
3-column view: test tree with search · console output tabbed by level · failure messages and stack traces.
Timeline Debugger (coming soon)
Step through any test case line by line — variable values as inline ghost text, watch panel, call stack, no breakpoints needed.
Commands
| Command | What it does |
|---|---|
Start Testing |
Run all tests and start watching |
Stop Testing |
End the session |
Stop Testing and Clear Cache |
Stop + wipe discovery cache |
Clear Cache and Restart Testing |
Fresh restart |
Select Project Root |
Pick root in multi-folder workspace |
Show Raw Output |
Open raw Jest output channel |
Tip: Shift-click ⏹ Stop to stop and clear cache in one click.
Configuration
All settings under liveTestRunner.*.
| Setting | Default | Description |
|---|---|---|
projectRoot |
"" |
Auto-detected for single-folder workspaces |
runMode |
"auto" |
"auto" calls Jest directly; "npm" delegates to npm test |
jestCommand |
"" |
Override Jest binary path |
onSaveDebounceMs |
300 |
Debounce delay after save (ms) |
durationThresholds.testAmberMs |
100 |
Test turns amber |
durationThresholds.testRedMs |
500 |
Test turns red |
durationThresholds.suiteAmberMs |
500 |
Suite turns amber |
durationThresholds.suiteRedMs |
2000 |
Suite turns red |
durationThresholds.fileAmberMs |
1000 |
File turns amber |
durationThresholds.fileRedMs |
5000 |
File turns red |
Supported frameworks
| Framework | Status |
|---|---|
| Jest | ✅ Fully supported |
| Create React App (react-scripts) | ✅ Fully supported |
| Vitest | 🗓 Planned |
Known limitations
- Individual test reruns use
--testNamePattern— may match multiple tests if names overlap - Test-level granularity and per-test console logs are only available after the background trace pass completes for a file; whole-file reruns are used as fallback
About
Built by EshLabs (Eshan Dias) — a software engineer who wanted live test feedback without paying for third-party tools.
⭐ Star on GitHub · 🐛 Report an issue
MIT License