RuleTester prints \u000a instead of newline #12027
Description
Since eslint 6, rule tester prints newline in codes as \u000a. It is hard to read for plugin developers.
Code to repoduce
npx mocha index.js
// index.js
const {RuleTester} = require('eslint');
const someRule = {
create() {
return {};
},
};
const ruleTester = new RuleTester();
ruleTester.run('some-rule', someRule, {
valid: [],
invalid: [
{
code: `
var a;
var b;
`,
errors: [{message: 'foooooooooooo'}],
},
],
});Actual output
Note the lines with \u000a.
0 passing (46ms)
1 failing
1) some-rule
invalid
\u000a var a;\u000a var b;\u000a :
AssertionError [ERR_ASSERTION]: Should have 1 error but had 0: []
+ expected - actual
-0
+1
Expected ouput
This is the behavior with npm i eslint@5.
1) some-rule
invalid
var a;
var b;
:
AssertionError [ERR_ASSERTION]: Should have 1 error but had 0: []
+ expected - actual
-0
+1