junit-report-merger

Merges multiple JUnit XML reports into one.

Reporters of many testing frameworks generate JUnit XML reports. mocha-junit-reporter, karma-junit-reporter to name a few. Sometimes there is a need to combine multiple reports together in a single file. This is what junit-report-merger does.

junit-report-merger creates a new test results report in JUnit XML format by collecting all <testsuite> elements from all XML reports and putting them together.

CLI

Package provides a jrm binary, which you can use to merge multiple xml reports into one.
In a nutshell it is a tiny wrapper around mergeFiles api.

Installing

Globally

npm install -g junit-report-merger

In this case you'll be able to execute jrm binary from within your shell.

Locally

npm install junit-report-merger --save-dev

In this case jrm binary will be available only inside package.json scripts:

scripts: {
    "merge-reports": "jrm combined.xml \"results/*.xml\""
}

Usage

Assuming your JUnit test results are in ./results/units/ folder, and you want to get a combined test result file in ./results/combined.xml:

jrm ./results/combined.xml "./results/units/*.xml"

You can also specify multiple glob patterns:

jrm ./results/combined.xml "./results/units/*.xml" "./results/e2e/*.xml"

NOTE
Make sure to wrap each pattern with double quotes ("), otherwise your shell may try to expand it instead of passing to Node.js.

API

Package exports a single object with the following methods.

mergeFiles - Merges contents of multiple XML report files into a single XML report file.

mergeStreams - Merges contents of multiple XML report streams into a single XML report stream.

mergeToString - Merges multiple XML report strings into a single XML report string.

Usage

const path = require('path')
const { mergeFiles } = require('junit-report-merger')

const outputFile = path.join(__dirname, 'results', 'combined.xml')

const inputFiles = ['./results/units/*.xml', './results/e2e/*.xml']

try {
  await mergeFiles(outputFile, inputFiles)
  console.log('Merged, check ./results/combined.xml')
} catch (err) {
  console.error(error)
}

mergeFiles

Signature:

mergeFiles(
    destFilePath: string,
    srcFilePathsOrGlobPatterns: string[],
    options?: MergeFilesOptions
) => Promise<void>

mergeFiles(
    destFilePath: string,
    srcFilePathsOrGlobPatterns: string[],
    options: MergeFilesOptions,
    cb: (err?: Error) => void
) => void

Reads multiple files, merges their contents and write into the given file.

Param	Type	Description
destFilePath	string	Where the output should be stored. Denotes a path to file. If file already exists, it will be overwritten.
srcFilePathsOrGlobPatterns	string[]	Paths to the files which should be merged. You can also specify glob patterns, such as results/**/report-*.xml
[options]	MergeFilesOptions	Merge options.
[cb]	(err?: Error) => void	Callback function which will be called at completion. Will receive error as first argument if any.

Last argument - cb is a Node.js style callback function. If callback function is not passed, function will return a promise. That is, all the following variants will work:

// options passed, callback style
mergeFiles(destFilePath, srcFilePaths, {}, (err) => {})

// options missing, callback style
mergeFiles(destFilePath, srcFilePaths, (err) => {})

// options passed, promise style
await mergeFiles(destFilePath, srcFilePaths, {})

// options missing, promise style
await mergeFiles(destFilePath, srcFilePaths)

MergeFilesOptions

These are the options accepted by mergeFiles.

Signature:

type MergeFilesOptions = {
    onFileMatched? (matchInfo: {
        filePath: string
    }) => void
}

onFileMatched

mergeFiles calls function specified by the onFileMatched option once for each file matched by srcFilePaths, right before file processing begins.

mergeStreams

Signature:

mergeStreams(
    destStream: WritableStream,
    srcStreams: ReadableStream[],
    options?: {}
) => Promise<void>

mergeStreams(
    destStream: WritableStream,
    srcStreams: ReadableStream[],
    options: {},
    cb: (err?: Error) => void
) => void

Reads multiple streams, merges their contents and write into the given stream.

Param	Type	Description
destStream	WritableStream	A stream which will be used to write the merge result.
srcStreams	ReadableStream[]	Streams which will be used to read data from.
[options]	object	Merge options. Currently unused.
[cb]	(err?: Error) => void	Callback function which will be called at completion. Will receive error as first argument if any.

Last argument - cb is a Node.js style callback function. If callback function is not passed, function will return a promise. That is, all the following variants will work:

// options passed, callback style
mergeStreams(destStream, srcStreams, {}, (err) => {})

// options missing, callback style
mergeStreams(destStream, srcStreams, (err) => {})

// options passed, promise style
await mergeStreams(destStream, srcStreams, {})

// options missing, promise style
await mergeStreams(destStream, srcStreams)

mergeToString

Signature:

mergeToString(
    srcStrings: string[],
    options?: {}
) => string

Merges given XML strings and returns the result.

Param	Type	Description
srcStrings	string[]	Array of strings to merge together.
[options]	object	Merge options. Currently unused.

JUnit XML Format

Unfortunately, there is no official specification of JUnit XML file format.

The XML schema for the original JUnit XML format is here.

Over the time, various CI tools and test management software augmented original format with their own properties.
The most comprehensive overview of the format is put together by folks at Testmo here. jrm produces output conforming to that format and accepts files conforming to that format.

License

MIT (http://www.opensource.org/licenses/mit-license.php)