Add outputFile option

index.js

@@ -4,6 +4,7 @@ const through = require('through2');
 const dargs = require('dargs');
 const resolveCwd = require('resolve-cwd');
 const execa = require('execa');
+const fs = require('fs');
 
 const BINARY = require.resolve('ava/cli.js');
 
@@ -50,6 +51,11 @@ module.exports = options => {
 			subprocess.stderr.pipe(process.stderr);
 		}
 
+		if (options.outputFile) {
+			const fileStream = fs.createWriteStream(options.outputFile);
+			subprocess.stdout.pipe(fileStream);
+		}
+
 		try {
 			await subprocess;
 			callback();

readme.md

@@ -45,3 +45,10 @@ Type: `boolean`<br>
 Default: `false`
 
 Run AVA with [`nyc`](https://github.com/istanbuljs/nyc). You must have `nyc` as a devDependency. `nyc` [options](https://github.com/istanbuljs/nyc#configuring-nyc) can be defined in package.json.
+
+#### outputFile
+
+Type: `string`<br>
+Default: `undefined`
+
+Store a copy of the stdout of AVA as a file. Example: `tests/output/tapOutput.txt`