cypress-io · bahmutov · Apr 17, 2020 · Apr 17, 2020 · Apr 17, 2020 · Apr 17, 2020
diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -194,6 +194,30 @@ workflows:
                   ../../node_modules/.bin/only-covered main.js
                 working_directory: examples/before-all-visit
 
+      - cypress/run:
+          attach-workspace: true
+          name: example-docker-paths
+          requires:
+            - cypress/install
+          # there are no jobs to follow this one
+          # so no need to save the workspace files (saves time)
+          no-workspace: true
+          working_directory: examples/docker-paths
+          command: '../../node_modules/.bin/cypress run'
+          post-steps:
+            # store the created coverage report folder
+            # you can click on it in the CircleCI UI
+            # to see live static HTML site
+            - store_artifacts:
+                path: examples/docker-paths/coverage
+            - run:
+                name: Check code coverage 📈
+                command: |
+                  ../../node_modules/.bin/check-coverage main.js
+                  ../../node_modules/.bin/check-coverage second.js
+                  ../../node_modules/.bin/only-covered main.js second.js
+                working_directory: examples/docker-paths
+
       - cypress/run:
           attach-workspace: true
           name: example-ts-example
@@ -395,3 +419,4 @@ workflows:
             - example-use-plugins-and-support
             - example-one-spec
             - example-exclude-files
+            - example-docker-paths
diff --git a/examples/docker-paths/README.md b/examples/docker-paths/README.md
@@ -0,0 +1,38 @@
+# example-docker-paths
+
+In this example, the source files are "instrumented" as if they were instrumented inside a Docker container. Still, Cypress code coverage plugin should find the matching current folder where same files exist and update `.nyc_output/out.json` file before generating reports.
+
+Source files from `app` folder were instrumented into `dist` folder with command
+
+```shell
+$ npx nyc instrument app dist
+```
+
+Then the `index.html` file was copied into `dist` folder.
+
+Then the source paths in [dist/main.js](dist/main.js) and [dist/second.js](dist/second.js) were changed to non-existent prefix folder `/var/www/test/site`.
+
+When Cypress runs, the `.nyc_output/out.json` is updated, so the path is valid local path like:
+
+```
+{
+  "/var/www/test/site/app/main.js": {
+    "path": "/Users/gleb/git/code-coverage/examples/docker-paths/app/main.js",
+    "statementMap": {
+      ...
+```
+
+And the report has valid HTML with sources
+
+![All files](images/files.png)
+
+![Single file](images/file.png)
+
+**Note:** remember to remove existing `.nyc_output` folder if running Cypress in non-interactive mode `rm -rf .nyc_output/`.
+
+When running with [debug logs](https://github.com/cypress-io/code-coverage#debugging) you should see messages:
+
+```
+found common folder /var/www/test/site that matches
+current working directory /Users/gleb/git/code-coverage/examples/docker-paths
+```
diff --git a/examples/docker-paths/app/index.html b/examples/docker-paths/app/index.html
@@ -0,0 +1,17 @@
+<body>
+  Page body
+  <script src="main.js"></script>
+  <script src="second.js"></script>
+  <script>
+    // 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')
+    }
+  </script>
+</body>
diff --git a/examples/docker-paths/app/main.js b/examples/docker-paths/app/main.js
@@ -0,0 +1,3 @@
+window.add = (a, b) => a + b
+
+window.sub = (a, b) => a - b
diff --git a/examples/docker-paths/app/second.js b/examples/docker-paths/app/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/examples/docker-paths/cypress.json b/examples/docker-paths/cypress.json
@@ -0,0 +1,5 @@
+{
+  "pluginsFile": "../../plugins",
+  "supportFile": "../../support",
+  "fixturesFolder": false
+}
diff --git a/examples/docker-paths/cypress/integration/spec.js b/examples/docker-paths/cypress/integration/spec.js
@@ -0,0 +1,11 @@
+/// <reference types="cypress" />
+describe('docker-paths', () => {
+  it('works', () => {
+    cy.visit('dist/index.html')
+    cy.contains('Page body')
+
+    cy.window()
+      .invoke('reverse', 'super')
+      .should('equal', 'repus')
+  })
+})
diff --git a/examples/docker-paths/dist/index.html b/examples/docker-paths/dist/index.html
@@ -0,0 +1,17 @@
+<body>
+  Page body
+  <script src="main.js"></script>
+  <script src="second.js"></script>
+  <script>
+    // 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')
+    }
+  </script>
+</body>
diff --git a/examples/docker-paths/dist/main.js b/examples/docker-paths/dist/main.js
diff --git a/examples/docker-paths/dist/second.js b/examples/docker-paths/dist/second.js
diff --git a/examples/docker-paths/images/file.png b/examples/docker-paths/images/file.png
diff --git a/examples/docker-paths/images/files.png b/examples/docker-paths/images/files.png
diff --git a/examples/docker-paths/package.json b/examples/docker-paths/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "example-docker-paths",
+  "private": true,
+  "version": "1.0.0",
+  "description": "Instrumented files in Docker container are found locally",
+  "main": "index.js",
+  "scripts": {
+    "cy:open": "../../node_modules/.bin/cypress open",
+    "cy:run": "../../node_modules/.bin/cypress run"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}
diff --git a/package.json b/package.json
@@ -66,5 +66,8 @@
     "serve": "11.3.0",
     "start-server-and-test": "1.10.11",
     "typescript": "3.8.3"
+  },
+  "nyc": {
+    "exclude": ["utils.js"]
   }
 }
diff --git a/task.js b/task.js
@@ -1,10 +1,15 @@
 // @ts-check
 const istanbul = require('istanbul-lib-coverage')
-const { join, resolve, isAbsolute } = require('path')
+const { join, resolve } = require('path')
 const { existsSync, mkdirSync, readFileSync, writeFileSync } = require('fs')
 const execa = require('execa')
-const fs = require('fs')
-const { fixSourcePathes } = require('./utils')
+const {
+  fixSourcePathes,
+  showNycInfo,
+  resolveRelativePaths,
+  checkAllPathsNotFound,
+  tryFindingLocalFiles
+} = require('./utils')
 const NYC = require('nyc')
 
 const debug = require('debug')('code-coverage')
@@ -20,8 +25,8 @@ const nycFilename = join(coverageFolder, 'out.json')
 // potentially there might be "nyc" options in other configuration files
 // it allows, but for now ignore those options
 const pkgFilename = join(processWorkingDirectory, 'package.json')
-const pkg = fs.existsSync(pkgFilename)
-  ? JSON.parse(fs.readFileSync(pkgFilename, 'utf8'))
+const pkg = existsSync(pkgFilename)
+  ? JSON.parse(readFileSync(pkgFilename, 'utf8'))
   : {}
 const nycOptions = pkg.nyc || {}
 const scripts = pkg.scripts || {}
@@ -37,52 +42,6 @@ function saveCoverage(coverage) {
   writeFileSync(nycFilename, JSON.stringify(coverage, null, 2))
 }
 
-/**
- * Looks at all coverage objects in the given JSON coverage file
- * and if the file is relative, and exists, changes its path to
- * be absolute.
- */
-function resolvePaths(nycFilename) {
-  const nycCoverage = JSON.parse(readFileSync(nycFilename, 'utf8'))
-
-  const coverageKeys = Object.keys(nycCoverage)
-  if (!coverageKeys.length) {
-    console.error('⚠️ file %s has no coverage information', nycFilename)
-    return
-  }
-  debug('NYC file %s has %d key(s)', nycFilename, coverageKeys.length)
-
-  let changed
-  const maxPrintKeys = 3
-
-  Object.keys(nycCoverage).forEach((key, k) => {
-    const coverage = nycCoverage[key]
-
-    // printing a few found keys and file paths from the coverage file
-    // will make debugging any problems much much easier
-    if (k < maxPrintKeys) {
-      debug('%d key %s file path %s', k + 1, key, coverage.path)
-    }
-
-    if (coverage.path && !isAbsolute(coverage.path)) {
-      if (existsSync(coverage.path)) {
-        debug('resolving path %s', coverage.path)
-        coverage.path = resolve(coverage.path)
-        changed = true
-      }
-    }
-  })
-
-  if (changed) {
-    debug('saving updated file %s', nycFilename)
-    writeFileSync(
-      nycFilename,
-      JSON.stringify(nycCoverage, null, 2) + '\n',
-      'utf8'
-    )
-  }
-}
-
 const tasks = {
   /**
    * Clears accumulated code coverage information.
@@ -143,7 +102,13 @@ const tasks = {
       return null
     }
 
-    resolvePaths(nycFilename)
+    showNycInfo(nycFilename)
+    const allSourceFilesMissing = checkAllPathsNotFound(nycFilename)
+    if (allSourceFilesMissing) {
+      tryFindingLocalFiles(nycFilename)
+    }
+
+    resolveRelativePaths(nycFilename)
 
     if (customNycReportScript) {
       debug(
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		window.add = (a, b) => a + b

		window.sub = (a, b) => a - b