Babel plugin for power-assert.
babel-plugin-espower is a Babel plugin for power-assert.
power-assert provides descriptive assertion messages for your tests, like this.
1) ES6 demo Destructuring and TemplateLiteral:
AssertionError: # test/demo_test.js:7
assert(`${ alice.name } and ${ bob.name }` === `bob and alice`)
| | | | | | |
| | | | | | "bob and alice"
| | | | "bob" false
| | "alice" Object{name:"bob"}
| Object{name:"alice"}
"alice and bob"
--- [string] `bob and alice`
+++ [string] `${ alice.name } and ${ bob.name }`
@@ -1,13 +1,13 @@
-bob and alice
+alice and bob
Pull-requests, issue reports and patches are always welcomed. See power-assert project for more documentation.
$ npm install --save-dev babel-plugin-espower
$ $(npm bin)/babel --plugins babel-plugin-espower /path/to/test/some_test.js > /path/to/build/some_test.js
or shortly,
$ $(npm bin)/babel --plugins espower /path/to/test/some_test.js > /path/to/build/some_test.js
var babel = require('babel-core');
var jsCode = fs.readFileSync('/path/to/test/some_test.js');
var transformed = babel.transform(jsCode, {
plugins: ['babel-plugin-espower']
});
console.log(transformed.code);
require('babel/register')({
only: /test\/tobe_instrumented/,
plugins: ['babel-plugin-espower'],
extensions: ['.es6', '.js']
});
For example, with babel_hook.js above, you can run mocha without code generation steps.
$ $(npm bin)/mocha --require ./babel_hook /path/to/test/demo_test.js
var fs = require('fs');
var browserify = require('browserify');
var babelify = require('babelify');
var glob = require('glob'),
browserify({ entries: glob.sync('./test/*_test.js'), debug: true })
.transform(babelify.configure({ plugins: ['babel-plugin-espower'] }))
.bundle()
.on('error', function (err) { console.log('Error : ' + err.message); })
.pipe(fs.createWriteStream('all_test.js'));
$ $(npm bin)/browserify -d -e ./test/*_test.js -t [ babelify --plugins babel-plugin-espower ]
var source = require('vinyl-source-stream');
var browserify = require('browserify');
var glob = require('glob'),
gulp.task('build_test', function() {
var files = glob.sync('./test/*_test.js');
var b = browserify({entries: files, debug: true});
b.transform(babelify.configure({
plugins: ['babel-plugin-espower']
}));
return b.bundle()
.pipe(source('all_test.js'))
.pipe(gulp.dest('./build'));
});
module.exports = function(config) {
config.set({
frameworks: ['mocha', 'browserify'],
files: [
"test/**/*.js"
],
preprocessors: {
"test/**/*.js": "browserify"
},
browserify: {
debug: true,
transform: [
['babelify', {plugins: ['babel-plugin-espower']}]
]
},
// ...
For given test file demo_test.js below,
import assert from 'power-assert';
describe('ES6 demo', () => {
it('Destructuring and TemplateLiteral', () => {
let [alice, bob] = [ { name: 'alice' }, { name: 'bob' } ];
assert(`${alice.name} and ${bob.name}` === `bob and alice`);
});
it('ArrowFunctionExpression and SpreadElement', () => {
let seven = 7, ary = [4, 5];
assert(seven === ((v, i) => v + i)(...[...ary]));
});
it('Enhanced Object Literals', () => {
let name = 'bobby';
assert.deepEqual({
name,
[ `${name}'s greet` ]: `Hello, I'm ${name}`
}, null);
});
});
Run babel with --plugins espower to transform tests.
$ $(npm bin)/babel --plugins espower /path/to/test/demo_test.js > /path/to/build/demo_test.js
Then run. You will see the power-assert output appears.
$ $(npm bin)/mocha /path/to/build/demo_test.js
ES6 demo
1) Destructuring and TemplateLiteral
2) ArrowFunctionExpression and SpreadElement
3) Enhanced Object Literals
0 passing
3 failing
1) ES6 demo Destructuring and TemplateLiteral:
AssertionError: # test/demo_test.js:7
assert(`${ alice.name } and ${ bob.name }` === `bob and alice`)
| | | | | | |
| | | | | | "bob and alice"
| | | | "bob" false
| | "alice" Object{name:"bob"}
| Object{name:"alice"}
"alice and bob"
--- [string] `bob and alice`
+++ [string] `${ alice.name } and ${ bob.name }`
@@ -1,13 +1,13 @@
-bob and alice
+alice and bob
at Context.<anonymous> (build/demo_test.js:19:28)
2) ES6 demo ArrowFunctionExpression and SpreadElement:
AssertionError: # test/demo_test.js:12
assert(seven === ((v, i) => v + i)(...[...ary]))
| | | | |
| | | | [4,5]
| | 9 [4,5]
7 false
[number] ((v, i) => v + i)(...[...ary])
=> 9
[number] seven
=> 7
at Context.<anonymous> (build/demo_test.js:29:28)
3) ES6 demo Enhanced Object Literals:
AssertionError: # test/demo_test.js:17
assert.deepEqual({name,[`${ name }'s greet`]: `Hello, I'm ${ name }`}, null)
| | | | |
| | | | "bobby"
| | "bobby" "Hello, I'm bobby"
| "bobby's greet"
Object{name:"bobby","bobby's greet":"Hello, I'm bobby"}
at Context.<anonymous> (build/demo_test.js:40:29)
You can customize assertion patterns via Babel API,
var babel = require('babel-core');
var createEspowerPlugin = require('babel-plugin-espower/create');
var jsCode = fs.readFileSync('/path/to/test/some_test.js');
var transformed = babel.transform(jsCode, {
plugins: [
createEspowerPlugin(babel, {
patterns: [
'assert.isNull(object, [message])',
'assert.same(actual, expected, [message])',
'assert.near(actual, expected, delta, [message])'
]
})
]
});
console.log(transformed.code);
or via Require Hook.
var createEspowerPlugin = require('babel-plugin-espower/create');
require('babel/register')({
only: /test\/tobe_instrumented/,
plugins: [
createEspowerPlugin(babel, {
patterns: [
'assert.isNull(object, [message])',
'assert.same(actual, expected, [message])',
'assert.near(actual, expected, delta, [message])'
]
})
],
extensions: ['.es6', '.js']
}); type default value object (return value of espower.defaultOptions() with default visitorKeys, path, sourceRoot and sourceMap)
Configuration options for internal espower module. If not passed, default options will be used (return value of espower.defaultOptions() with default visitorKeys, path, sourceRoot and sourceMap. visitorKeys is value of babel.types.VISITOR_KEYS. path is filename passed to babel. sourceRoot is be return value of process.cwd(), sourceMap is babel's internal SourceMap object).
See CHANGELOG
Licensed under the MIT license.
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