Laporan Coverage dan Gas
Metrik kualitas
Laporan Coverage dan Gas adalah pelajaran Web3 & DApp Development Fundamentals gratis di CoddyKit. Ini adalah pelajaran 3 dari 4. Kamu bisa membaca pelajaran lengkapnya di bawah secara gratis — lalu praktikkan langsung di browser dengan editor kode bawaan dan tutor AI 24/7. Ini adalah bagian dari jalur belajar Web3 & DApp Development Fundamentals, dan progresmu tersinkronisasi di web dan aplikasi CoddyKit. Kursus Web3 & DApp Development Fundamentals mencakup 4 pelajaran total.
Bagian dari pelajaran ini belum diterjemahkan dan ditampilkan dalam bahasa Inggris.
Quality Metrics
Two metrics help judge contract quality:
- Code coverage — how much of your Solidity is exercised by tests.
- Gas usage — how expensive your functions are to call.
Both are available as Hardhat plugins, and the Toolbox includes the gas reporter.
What Coverage Tells You
Coverage measures the percentage of statements, branches, and functions touched by your tests.
- Low coverage means untested code paths — potential hidden bugs.
- 100% coverage does not guarantee correctness, but gaps are red flags.
Installing Coverage
The solidity-coverage plugin instruments your contracts and reports coverage:
npm install --save-dev solidity-coverageThen require it in your config:
require("solidity-coverage");npm install --save-dev solidity-coverage
// in hardhat.config.js:
require("solidity-coverage");Running Coverage
Run the coverage task to execute your tests with instrumentation:
npx hardhat coverageIt prints a table per file and writes an HTML report to coverage/ you can open in a browser.
npx hardhat coverageReading a Coverage Table
The report has four columns:
- % Stmts — statements executed.
- % Branch — if/else branches taken.
- % Funcs — functions called.
- % Lines — lines reached.
Branch coverage is often the hardest to fill — make sure both sides of every condition are tested.
The Gas Reporter
The hardhat-gas-reporter (in the Toolbox) prints gas costs for each function call during tests. Enable it in config:
module.exports = {
gasReporter: {
enabled: true,
},
};It outputs a table after npx hardhat test.
module.exports = {
gasReporter: {
enabled: true,
},
};Reading the Gas Table
The gas report shows, per method:
- Min / Max / Avg gas across calls.
- # calls — how often it ran in tests.
- Deployment cost for each contract.
Functions that vary widely between min and max often have conditional logic worth examining.
Pricing in Fiat
The gas reporter can show estimated costs in real money by fetching a gas price and token price:
gasReporter: {
enabled: true,
currency: "USD",
gasPrice: 30,
}This helps you communicate the real cost of operations to stakeholders.
gasReporter: {
enabled: true,
currency: "USD",
gasPrice: 30,
}Toggling with Env Vars
Coverage and gas reporting slow tests down, so gate them behind an environment variable:
gasReporter: {
enabled: process.env.REPORT_GAS === "true",
}Run REPORT_GAS=true npx hardhat test only when you need the report.
gasReporter: {
enabled: process.env.REPORT_GAS === "true",
}Using Metrics in CI
In continuous integration you can:
- Fail the build if coverage drops below a threshold.
- Comment gas diffs on pull requests.
These guardrails keep quality from silently regressing as the codebase grows.
Outputting to a File
The gas reporter can write its table to a file for archiving or diffing in CI:
gasReporter: {
enabled: true,
outputFile: "gas-report.txt",
noColors: true,
}Disabling colors keeps the file readable. Coverage similarly produces a coverage/ HTML report and an lcov.info file.
gasReporter: {
enabled: true,
outputFile: "gas-report.txt",
noColors: true,
}Quick Check
Test your understanding of coverage and gas reports.
Recap
You learned to measure test and gas quality.
solidity-coveragereports statement, branch, function, and line coverage vianpx hardhat coverage.- Branch coverage best reveals untested paths.
- The gas reporter (in the Toolbox) prints per-method gas and deployment costs.
- It can price calls in fiat and be toggled with an env var.
- Enforce thresholds in CI to prevent regressions.
Pertanyaan yang Sering Diajukan
Apakah pelajaran “Laporan Coverage dan Gas” gratis?
Ya — teks lengkap “Laporan Coverage dan Gas” gratis dibaca di sini di web. Untuk praktiknya secara interaktif (editor kode bawaan dan tutor AI 24/7) dan buka sisa kursus Web3 & DApp Development Fundamentals, upgrade ke CoddyKit PRO. Kursus Web3 & DApp Development Fundamentals mencakup 4 pelajaran total.
Apa yang akan aku pelajari di “Laporan Coverage dan Gas”?
Metrik kualitas Kamu berlatih Web3 & DApp Development Fundamentals dengan kode praktik yang langsung kamu jalankan di browser, dan tutor AI 24/7 menjawab pertanyaanmu saat kamu mengerjakan pelajaran ini.
Apakah aku perlu pengalaman untuk memulai Web3 & DApp Development Fundamentals?
Tidak diperlukan pengalaman sebelumnya. Web3 & DApp Development Fundamentals di CoddyKit dirancang untuk pemula hingga pelajar tingkat lanjut, jadi kamu bisa memulai di sini atau dari awal dan belajar sesuai kecepatan kamu sendiri. Ini adalah pelajaran 3 dari 4.
Berapa lama pelajaran “Laporan Coverage dan Gas” memakan waktu?
Sebagian besar pelajaran CoddyKit memakan waktu sekitar 5–10 menit. Setiap pelajaran ringkas dan interaktif, jadi kamu membuat kemajuan stabil dan melanjutkan dari tempat kamu tinggalkan di web dan aplikasi.
Bisakah aku menulis dan menjalankan kode dalam pelajaran Web3 & DApp Development Fundamentals ini?
Ya. Setiap pelajaran Web3 & DApp Development Fundamentals menyertakan editor kode bawaan, jadi kamu menulis dan menjalankan kode nyata langsung di browser dan mendapatkan umpan balik AI instan — tidak diperlukan penyiapan lokal.
Semua pelajaran dalam kursus ini
- Menulis Pengujian
- Menguji Revert dan Event
- Laporan Coverage dan Gas
- Fixture