diff --git a/.circleci/config.yml b/.circleci/config.yml
index 023f9cb0c..c68d05611 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -146,6 +146,7 @@ workflows:
jobname:
- all-files
- backend
+ - batch-send-coverage
- before-all-visit
- before-each-visit
- cra-e2e-and-ct
@@ -174,6 +175,7 @@ workflows:
- test-code-coverage-plugin
- test-all-files
- test-backend
+ - test-batch-send-coverage
- test-before-all-visit
- test-before-each-visit
- test-cra-e2e-and-ct
diff --git a/README.md b/README.md
index 75f5ede6c..3b11182b1 100644
--- a/README.md
+++ b/README.md
@@ -549,7 +549,7 @@ Deeply nested objects will sometimes have `[object Object]` values printed. You
DEBUG_DEPTH=10 DEBUG=code-coverage npm run dev
```
-### Common issues
+## Common issues
Common issue: [not instrumenting your application when running Cypress](#instrument-your-application).
@@ -557,6 +557,13 @@ If the plugin worked before in version X but stopped after upgrading to version
If you decide to open an issue in this repository, please fill in all information the [issue template](https://github.com/cypress-io/code-coverage/blob/master/.github/ISSUE_TEMPLATE/bug_report.md) asks for. The issues most likely to be resolved have debug logs, screenshots, and hopefully public repository links so we can try running the tests ourselves.
+### Coverage reporting timeouts
+
+If the plugin times out when sending coverage report data to be merged, this may be due to a very large
+report being sent across processes. You can batch the report by setting the `sendCoverageBatchSize` environment
+variable in your `cypress.config.js` file's 'env' section. Assign the variable an integer value representing
+the number of report keys to send per batch.
+
## Contributing
You can test changes locally by running tests and confirming that the code coverage has been calculated and saved.
diff --git a/support-utils.js b/support-utils.js
index 6007c5cc5..6f2a43f17 100644
--- a/support-utils.js
+++ b/support-utils.js
@@ -148,7 +148,19 @@ function fixSourcePaths(coverage) {
})
}
+/**
+ * Validates and returns the configured batch size for
+ * sending coverage to the backend
+ */
+function getSendCoverageBatchSize() {
+ const batchSize = Cypress.env('sendCoverageBatchSize')
+ const parsedBatchSize = parseInt(batchSize)
+ const isValid = !isNaN(parsedBatchSize) && parsedBatchSize > 0
+ return isValid ? parsedBatchSize : null
+}
+
module.exports = {
fixSourcePaths,
- filterFilesFromCoverage
+ filterFilesFromCoverage,
+ getSendCoverageBatchSize
}
diff --git a/support.js b/support.js
index d6f427b63..dcec20929 100644
--- a/support.js
+++ b/support.js
@@ -3,7 +3,10 @@
const dayjs = require('dayjs')
var duration = require('dayjs/plugin/duration')
-const { filterFilesFromCoverage } = require('./support-utils')
+const {
+ filterFilesFromCoverage,
+ getSendCoverageBatchSize
+} = require('./support-utils')
dayjs.extend(duration)
@@ -16,10 +19,37 @@ const sendCoverage = (coverage, pathname = '/') => {
const totalCoverage = filterFilesFromCoverage(coverage)
- // stringify coverage object for speed
- cy.task('combineCoverage', JSON.stringify(totalCoverage), {
- log: false
- })
+ const envBatchSize = getSendCoverageBatchSize()
+ const keys = Object.keys(totalCoverage)
+
+ if (envBatchSize && envBatchSize < keys.length) {
+ sendBatchCoverage(totalCoverage, envBatchSize)
+ } else {
+ cy.task('combineCoverage', JSON.stringify(totalCoverage), {
+ log: false
+ })
+ }
+}
+
+/**
+ * Sends collected code coverage object to the backend code
+ * in batches via "cy.task".
+ */
+const sendBatchCoverage = (totalCoverage, batchSize) => {
+ const keys = Object.keys(totalCoverage)
+
+ for (let i = 0; i < keys.length; i += batchSize) {
+ const batchKeys = keys.slice(i, i + batchSize)
+ const batchCoverage = {}
+
+ batchKeys.forEach((key) => {
+ batchCoverage[key] = totalCoverage[key]
+ })
+
+ cy.task('combineCoverage', JSON.stringify(batchCoverage), {
+ log: false
+ })
+ }
}
/**
diff --git a/test-apps/batch-send-coverage/.babelrc b/test-apps/batch-send-coverage/.babelrc
new file mode 100644
index 000000000..7a016cf8e
--- /dev/null
+++ b/test-apps/batch-send-coverage/.babelrc
@@ -0,0 +1,3 @@
+{
+ "plugins": ["istanbul"]
+}
diff --git a/test-apps/batch-send-coverage/README.md b/test-apps/batch-send-coverage/README.md
new file mode 100644
index 000000000..50e4494a4
--- /dev/null
+++ b/test-apps/batch-send-coverage/README.md
@@ -0,0 +1,4 @@
+# Test Case: Batch Send Coverage
+This test app tests that all expected files are covered when using
+the `sendCoverageBatchSize` environment variable in the Cypress
+configuration file.
diff --git a/test-apps/batch-send-coverage/cypress.config.js b/test-apps/batch-send-coverage/cypress.config.js
new file mode 100644
index 000000000..7a3363214
--- /dev/null
+++ b/test-apps/batch-send-coverage/cypress.config.js
@@ -0,0 +1,14 @@
+const { defineConfig } = require('cypress')
+
+module.exports = defineConfig({
+ fixturesFolder: false,
+ env: {
+ sendCoverageBatchSize: 1
+ },
+ e2e: {
+ setupNodeEvents(on, config) {
+ return require('./cypress/plugins/index.js')(on, config)
+ },
+ baseUrl: 'http://localhost:1234'
+ }
+})
diff --git a/test-apps/batch-send-coverage/cypress/e2e/spec.cy.js b/test-apps/batch-send-coverage/cypress/e2e/spec.cy.js
new file mode 100644
index 000000000..f78611ad8
--- /dev/null
+++ b/test-apps/batch-send-coverage/cypress/e2e/spec.cy.js
@@ -0,0 +1,24 @@
+///
+it('works', () => {
+ cy.visit('/')
+ cy.contains('Page body')
+
+ cy.window()
+ .invoke('reverse', 'super')
+ .should('equal', 'repus')
+
+ cy.window()
+ .invoke('numsTimesTwo', [1, 2, 3])
+ .should('deep.equal', [2, 4, 6])
+
+ cy.window()
+ .invoke('add', 2, 3)
+ .should('equal', 5)
+
+ cy.window()
+ .invoke('sub', 5, 2)
+ .should('equal', 3)
+
+ // application's code should be instrumented
+ cy.window().should('have.property', '__coverage__')
+})
diff --git a/test-apps/batch-send-coverage/cypress/plugins/index.js b/test-apps/batch-send-coverage/cypress/plugins/index.js
new file mode 100644
index 000000000..101311b68
--- /dev/null
+++ b/test-apps/batch-send-coverage/cypress/plugins/index.js
@@ -0,0 +1,4 @@
+module.exports = (on, config) => {
+ require('@cypress/code-coverage/task')(on, config)
+ return config
+}
diff --git a/test-apps/batch-send-coverage/cypress/support/commands.js b/test-apps/batch-send-coverage/cypress/support/commands.js
new file mode 100644
index 000000000..cc6040de7
--- /dev/null
+++ b/test-apps/batch-send-coverage/cypress/support/commands.js
@@ -0,0 +1 @@
+import '@cypress/code-coverage/support'
diff --git a/test-apps/batch-send-coverage/cypress/support/e2e.js b/test-apps/batch-send-coverage/cypress/support/e2e.js
new file mode 100644
index 000000000..b5c578c9d
--- /dev/null
+++ b/test-apps/batch-send-coverage/cypress/support/e2e.js
@@ -0,0 +1 @@
+require('./commands')
diff --git a/test-apps/batch-send-coverage/index.html b/test-apps/batch-send-coverage/index.html
new file mode 100644
index 000000000..776867487
--- /dev/null
+++ b/test-apps/batch-send-coverage/index.html
@@ -0,0 +1,17 @@
+
+ Page body
+
+
+
+ // use functions creates in "main.js"
+ if (add(2, 3) !== 5) {
+ throw new Error('wrong addition')
+ }
+ if (sub(2, 3) !== -1) {
+ throw new Error('wrong subtraction')
+ }
+ if (reverse('foo') !== 'oof') {
+ throw new Error('wrong string reverse')
+ }
+
+
diff --git a/test-apps/batch-send-coverage/main.js b/test-apps/batch-send-coverage/main.js
new file mode 100644
index 000000000..5dd69be2f
--- /dev/null
+++ b/test-apps/batch-send-coverage/main.js
@@ -0,0 +1,3 @@
+window.add = (a, b) => a + b
+
+window.sub = (a, b) => a - b
diff --git a/test-apps/batch-send-coverage/package-lock.json b/test-apps/batch-send-coverage/package-lock.json
new file mode 100644
index 000000000..9afe2cc91
--- /dev/null
+++ b/test-apps/batch-send-coverage/package-lock.json
@@ -0,0 +1,656 @@
+{
+ "name": "example-all-files",
+ "lockfileVersion": 3,
+ "requires": true,
+ "packages": {
+ "": {
+ "name": "example-all-files",
+ "devDependencies": {
+ "@babel/core": "^7.22.15"
+ }
+ },
+ "node_modules/@ampproject/remapping": {
+ "version": "2.3.0",
+ "resolved": "https://registry.npmjs.org/@ampproject/remapping/-/remapping-2.3.0.tgz",
+ "integrity": "sha512-30iZtAPgz+LTIYoeivqYo853f02jBYSd5uGnGpkFV0M3xOt9aN73erkgYAmZU43x4VfqcnLxW9Kpg3R5LC4YYw==",
+ "dev": true,
+ "license": "Apache-2.0",
+ "dependencies": {
+ "@jridgewell/gen-mapping": "^0.3.5",
+ "@jridgewell/trace-mapping": "^0.3.24"
+ },
+ "engines": {
+ "node": ">=6.0.0"
+ }
+ },
+ "node_modules/@babel/code-frame": {
+ "version": "7.25.7",
+ "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.25.7.tgz",
+ "integrity": "sha512-0xZJFNE5XMpENsgfHYTw8FbX4kv53mFLn2i3XPoq69LyhYSCBJtitaHx9QnsVTrsogI4Z3+HtEfZ2/GFPOtf5g==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "@babel/highlight": "^7.25.7",
+ "picocolors": "^1.0.0"
+ },
+ "engines": {
+ "node": ">=6.9.0"
+ }
+ },
+ "node_modules/@babel/compat-data": {
+ "version": "7.25.7",
+ "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.25.7.tgz",
+ "integrity": "sha512-9ickoLz+hcXCeh7jrcin+/SLWm+GkxE2kTvoYyp38p4WkdFXfQJxDFGWp/YHjiKLPx06z2A7W8XKuqbReXDzsw==",
+ "dev": true,
+ "license": "MIT",
+ "engines": {
+ "node": ">=6.9.0"
+ }
+ },
+ "node_modules/@babel/core": {
+ "version": "7.25.7",
+ "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.25.7.tgz",
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+ "debug": "^4.1.0",
+ "gensync": "^1.0.0-beta.2",
+ "json5": "^2.2.3",
+ "semver": "^6.3.1"
+ },
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+ "node": ">=6.9.0"
+ },
+ "funding": {
+ "type": "opencollective",
+ "url": "https://opencollective.com/babel"
+ }
+ },
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+ "version": "7.25.7",
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+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "@babel/types": "^7.25.7",
+ "@jridgewell/gen-mapping": "^0.3.5",
+ "@jridgewell/trace-mapping": "^0.3.25",
+ "jsesc": "^3.0.2"
+ },
+ "engines": {
+ "node": ">=6.9.0"
+ }
+ },
+ "node_modules/@babel/helper-compilation-targets": {
+ "version": "7.25.7",
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+ "license": "MIT",
+ "dependencies": {
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+ },
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+ }
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+ }
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+ },
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diff --git a/test-apps/batch-send-coverage/package.json b/test-apps/batch-send-coverage/package.json
new file mode 100644
index 000000000..96ff4bda6
--- /dev/null
+++ b/test-apps/batch-send-coverage/package.json
@@ -0,0 +1,21 @@
+{
+ "name": "example-all-files",
+ "description": "Report all files",
+ "private": true,
+ "scripts": {
+ "cy:run": "cypress run",
+ "start": "parcel serve index.html",
+ "start:windows": "npx bin-up parcel serve index.html",
+ "pretest": "rimraf .nyc_output .cache coverage dist",
+ "test": "DEBUG=code-coverage DEBUG_DEPTH=10 start-test 1234 cy:run",
+ "coverage:verify": "npx nyc report --check-coverage true --lines 100",
+ "coverage:check-files": "check-coverage main.js second.js third.js cypress.config.js --from coverage/coverage-final.json"
+ },
+ "nyc": {
+ "all": true,
+ "include": "*.js"
+ },
+ "devDependencies": {
+ "@babel/core": "^7.22.15"
+ }
+}
diff --git a/test-apps/batch-send-coverage/second.js b/test-apps/batch-send-coverage/second.js
new file mode 100644
index 000000000..494a0c5fc
--- /dev/null
+++ b/test-apps/batch-send-coverage/second.js
@@ -0,0 +1,7 @@
+// this file should be excluded from the final coverage numbers
+// using "nyc.exclude" list in package.json
+window.reverse = s =>
+ s
+ .split('')
+ .reverse()
+ .join('')
diff --git a/test-apps/batch-send-coverage/third.js b/test-apps/batch-send-coverage/third.js
new file mode 100644
index 000000000..c13f28dfc
--- /dev/null
+++ b/test-apps/batch-send-coverage/third.js
@@ -0,0 +1 @@
+window.numsTimesTwo = nums => nums.map(n => n * 2)
\ No newline at end of file