Test Coverage Analyzer
Find untested code and close coverage gaps with AI insight
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Your coverage report says 84 percent, but which 16 percent is missing, and does any of it matter? Have you ever chased a number upward without the suite getting any better? Test Coverage Analyzer reads your code and points at the paths that are genuinely untested.
Short answer: Test Coverage Analyzer reviews code you paste in and identifies the branches, error paths and conditions your tests are likely missing, then suggests the specific tests that would close each gap.
What is Test Coverage Analyzer?
Test Coverage Analyzer is a free tool that looks at coverage from the code's side rather than the report's side. You paste a function or a module, and it works through the branches: the conditions, the error handlers, the early returns and the paths that only run when something unusual happens. What comes back is a list of what is untested and why each gap matters.
What The Analysis Points At
Finds reliably
- Branches with no obvious test, especially error paths
- Early returns and guard clauses that never get exercised
- Conditions where only one side is covered
- Exception handlers that have never been triggered
Cannot see
- Your actual test files, unless you paste them too
- Integration gaps between modules it has not been shown
- Whether an existing test asserts anything meaningful
How Does Test Coverage Analyzer Work?
The prompt box takes the code, or a description of the function if you would rather not paste source. Adding your existing tests underneath turns the output from a general list of paths into a genuine gap report.
- Paste the code, and the existing tests if you want a gap comparison.
- Pick a model, then set Language, Test Framework and Coverage Level.
- Generate, then work down the list from the riskiest gap.
Setting Language, Framework And Depth
| Option | What it changes | Where to start |
|---|---|---|
| Language | How the code is interpreted and any test syntax produced | Auto-Detect, or name it if the snippet is short |
| Test Framework | Jest, PyTest, JUnit, PHPUnit and others | Your project's framework, so suggested tests fit straight in |
| Coverage Level | Basic, Standard, Thorough or Exhaustive | Thorough, which reaches error paths without inventing scenarios |
| Test Type | Unit, integration, negative, end to end and more | Mixed, when you want the gaps rather than one category |
Add Assertions turns each identified gap into a concrete test rather than a note, and Add Comments explains what each new test is protecting.
Coverage Numbers That Mislead
Caution A high percentage says lines were executed, not that behaviour was checked. A test that calls a function and asserts nothing raises coverage and catches nothing, and those tests are common in suites built to hit a target.
Judge the suite by what a failure would tell you. If a test breaking would not tell you what is wrong, it is not doing much for you regardless of what the report says. Prioritise the untested paths where a fault would reach a user, and leave the trivial getters alone. Other tools for reading and improving existing code sit in the coding tools category.
Using this costs nothing, and EizTools asks for no account and sets no daily limit, and the model selector lets you run the same module through a second engine, which often surfaces a branch the first pass skipped. Test Coverage Analyzer carries an options panel written around code and test frameworks.
Frequently Asked Questions
Does it read my coverage report?
No. It reads the code you paste and reasons about which paths are likely untested, which is why pasting your existing tests alongside gives a sharper answer.
How much code can I analyse at once?
One module or a few related functions works best. A whole repository pasted in produces general advice instead of the specific gaps you came for.
What coverage percentage should I aim for?
None in particular. Aim for the important paths being tested with real assertions, which a percentage cannot measure and a target actively distorts.
Will it write the missing tests?
Yes, when Add Assertions is on and a Test Framework is set. Review each one, since the expected values come from your code as described rather than as run.
Coverage is a useful signal and a terrible goal. Looking at which paths are untested, rather than at a number, puts the effort where a fault would actually hurt, and that is usually a much shorter list than the report suggests. Paste a module above and start with the gap you would least like to explain after an incident.
Sabir Bepari
Founder of EizTools and a passionate AI enthusiast dedicated to building practical, user-friendly AI tools that simplify everyday tasks.
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