Implement preset

.editorconfig

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+root = true
+
+[*]
+indent_style = tab
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[{package.json,*.yml}]
+indent_style = space
+indent_size = 2

.gitignore

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+node_modules
+.nyc_output
+coverage

.travis.yml

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+language: node_js
+node_js:
+  - '7'
+  - '6'
+  - '4'
+cache:
+  directories:
+    - $HOME/.npm
+    - node_modules
+before_install: 'npm install --global npm'
+before_script: 'npm prune'
+script: 'npm run coverage'
+after_script: 'cat ./coverage/lcov.info | ./node_modules/.bin/coveralls'

appveyor.yml

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+environment:
+  matrix:
+    - nodejs_version: '7'
+    - nodejs_version: '6'
+    - nodejs_version: '4'
+install:
+  - ps: Install-Product node $env:nodejs_version
+  - set CI=true
+  - set AVA_APPVEYOR=true
+  - git config core.symlinks true
+  - git reset --hard
+  - npm install --global npm
+  - set PATH=%APPDATA%\npm;%PATH%
+  - npm install
+  - npm prune
+matrix:
+  fast_finish: true
+build: off
+clone_depth: 1
+cache:
+  - node_modules
+  - '%APPDATA%\npm-cache'
+test_script:
+  - node --version
+  - npm --version
+  - npm test

espower-patterns.json

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+[
+	"t.truthy(value, [message])",
+	"t.falsy(value, [message])",
+	"t.true(value, [message])",
+	"t.false(value, [message])",
+	"t.is(value, expected, [message])",
+	"t.not(value, expected, [message])",
+	"t.deepEqual(value, expected, [message])",
+	"t.notDeepEqual(value, expected, [message])",
+	"t.regex(contents, regex, [message])",
+	"t.notRegex(contents, regex, [message])"
+]

index.js

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+'use strict';
+const ESPOWER_PATTERNS = require('./espower-patterns.json');
+
+function buildPreset(context, options) {
+	const plugins = [];
+	if (!options || options.powerAssert !== false) {
+		plugins.push(require('babel-plugin-espower/create')(context, {
+			embedAst: true,
+			patterns: ESPOWER_PATTERNS
+		}));
+	}
+	plugins.push(require('babel-plugin-ava-throws-helper'));
+
+	return {plugins};
+}
+module.exports = buildPreset;

license

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+The MIT License (MIT)
+
+Copyright (c) Mark Wubben <[email protected]> (novemberborn.net)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

package-hash.js

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+'use strict';
+const packageHash = require('package-hash');
+
+module.exports = packageHash.sync([
+	require.resolve('./package.json'),
+	require.resolve('babel-plugin-espower/package.json'),
+	require.resolve('babel-plugin-ava-throws-helper/package.json')
+]);

package.json

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+{
+  "name": "@ava/babel-preset-transform-test-files",
+  "version": "0.0.0",
+  "description": "Test file transforms as used by AVA",
+  "main": "index.js",
+  "files": [
+    "index.js",
+    "espower-patterns.json",
+    "package-hash.js"
+  ],
+  "scripts": {
+    "test": "ava",
+    "posttest": "xo",
+    "coverage": "nyc npm test"
+  },
+  "engines": {
+    "node": ">=4"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/avajs/babel-preset-transform-test-files.git"
+  },
+  "keywords": [
+    "ava",
+    "babel-preset"
+  ],
+  "author": "Mark Wubben (https://novemberborn.net/)",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/avajs/babel-preset-transform-test-files/issues"
+  },
+  "homepage": "https://github.com/avajs/babel-preset-transform-test-files#readme",
+  "devDependencies": {
+    "ava": "^0.17.0",
+    "babel-core": "^6.21.0",
+    "coveralls": "^2.11.15",
+    "empower-core": "^0.6.1",
+    "nyc": "^10.1.2",
+    "proxyquire": "^1.7.10",
+    "xo": "^0.17.1"
+  },
+  "dependencies": {
+    "babel-plugin-ava-throws-helper": "^1.0.0",
+    "babel-plugin-espower": "^2.3.2",
+    "package-hash": "^1.2.0"
+  },
+  "nyc": {
+    "reporter": [
+      "html",
+      "lcov",
+      "text"
+    ]
+  }
+}

readme.md

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+# @ava/babel-preset-transform-test-files
+
+A [Babel] preset for use with [AVA] test files.
+
+Currently contains:
+
+* [`babel-plugin-espower`](https://github.com/power-assert-js/babel-plugin-espower)
+and the patterns that should be enhanced
+* [`babel-plugin-ava-throws-helper`](https://github.com/avajs/babel-plugin-ava-throws-helper/)
+
+## Install
+
+```console
+$ npm install --save @ava/babel-preset-transform-test-files
+```
+
+## Usage
+
+Add `@ava/transform-test-files` to your [Babel] presets. You can disable
+`babel-plugin-espower` by setting the `powerAssert` option to `false`:
+
+```json
+{
+  "presets": [
+    ["@ava/transform-test-files", {"powerAsssert": false}]
+  ]
+}
+```
+
+Require `@ava/babel-preset-transform-test-files/package-hash` to get a combined
+hash for the installed version of the preset, as well as the plugins used.
+
+[AVA]: https://ava.li
+[Babel]: https://babeljs.io/

test.js

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+import {runInNewContext} from 'vm';
+
+import test from 'ava';
+import * as babel from 'babel-core';
+import throwsHelper from 'babel-plugin-ava-throws-helper';
+import empower from 'empower-core';
+import proxyquire from 'proxyquire';
+
+import buildPreset from './index';
+
+const ESPOWER_PATTERNS = require('./espower-patterns.json');
+
+test('throws-helper is included', t => {
+	const {plugins} = buildPreset(babel);
+	t.true(plugins.indexOf(throwsHelper) > -1);
+});
+
+test('resulting preset transforms assertion patterns', t => {
+	const {code} = babel.transform(`
+		const value = 'value'
+		const expected = 'expected'
+		const contents = 'contents'
+		const regex = /regex/
+
+		// "Execute" the patterns. Hardcode them here, otherwise it's cheating.
+		t.truthy(value)
+		t.falsy(value)
+		t.true(value)
+		t.false(value)
+		t.is(value, expected)
+		t.not(value, expected)
+		t.deepEqual(value, expected)
+		t.notDeepEqual(value, expected)
+		t.regex(contents, regex)
+		t.notRegex(contents, regex)
+	`, {
+		ast: false,
+		babelrc: false,
+		presets: [buildPreset]
+	});
+
+	const appliedPatterns = [];
+	// Create a stub assertion object that can be enhanced using empower-core.
+	const assert = ESPOWER_PATTERNS
+		.map(p => /^t\.(.+)\(/.exec(p)[1])
+		.reduce((assert, name) => {
+			assert[name] = () => {};
+			return assert;
+		}, {});
+
+	runInNewContext(code, {
+		t: empower(assert, {
+			onSuccess({matcherSpec: {pattern}, powerAssertContext}) {
+				if (powerAssertContext) { // Only available if the empower plugin transformed the assertion.
+					appliedPatterns.push(pattern);
+				}
+			},
+			patterns: ESPOWER_PATTERNS
+		})
+	});
+	t.deepEqual(appliedPatterns, ESPOWER_PATTERNS);
+});
+
+test('the espower plugin can be disabled', t => {
+	const expected = 't.true(value);';
+	const {code} = babel.transform(expected, {
+		ast: false,
+		babelrc: false,
+		presets: [[require.resolve('./'), {powerAssert: false}]]
+	});
+	t.true(code === expected);
+});
+
+test('computes correct package hash', t => {
+	t.plan(2);
+
+	proxyquire('./package-hash', {
+		'package-hash': {
+			sync([preset, ...plugins]) {
+				t.true(preset === require.resolve('./package.json'));
+				t.deepEqual(plugins, [
+					require.resolve('babel-plugin-espower/package.json'),
+					require.resolve('babel-plugin-ava-throws-helper/package.json')
+				]);
+			}
+		}
+	});
+});