babel/packages/babel-generator/test/index.js

let Whitespace = require("../lib/whitespace");
let Printer    = require("../lib/printer");
let generate   = require("../lib");
let assert     = require("assert");
let parse      = require("babylon").parse;
let chai       = require("chai");
let t          = require("babel-types");
let _          = require("lodash");

suite("generation", function () {
  test("completeness", function () {
    _.each(t.VISITOR_KEYS, function (keys, type) {
      assert.ok(!!Printer.prototype[type], type + " should exist");
    });

    _.each(Printer.prototype, function (fn, type) {
      if (!/[A-Z]/.test(type[0])) return;
      assert.ok(t.VISITOR_KEYS[type], type + " should not exist");
    });
  });

  test("multiple sources", function () {
    let sources = {
      "a.js": "function hi (msg) { console.log(msg); }\n",
      "b.js": "hi('hello');\n"
    };
    let parsed = _.keys(sources).reduce(function (_parsed, filename) {
      _parsed[filename] = parse(sources[filename], { sourceFilename: filename });
      return _parsed;
    }, {});

    let combinedAst = {
      "type": "File",
      "program": {
        "type": "Program",
        "sourceType": "module",
        "body": [].concat(parsed["a.js"].program.body, parsed["b.js"].program.body)
      }
    };

    let generated = generate.default(combinedAst, { sourceMaps: true }, sources);

    chai.expect(generated.map).to.deep.equal({
      version: 3,
      sources: [ "a.js", "b.js" ],
      mappings: "AAAA,SAASA,EAAT,CAAaC,GAAb,EAAkB;AAAEC,UAAQC,GAAR,CAAYF,GAAZ;AAAmB;;ACAvCD,GAAG,OAAH",
      names: [
        "hi",
        "msg",
        "console",
        "log",
      ],
      sourcesContent: [
        "function hi (msg) { console.log(msg); }\n",
        "hi('hello');\n"
      ]
    }, "sourcemap was incorrectly generated");

    chai.expect(generated.code).to.equal(
      "function hi(msg) {\n  console.log(msg);\n}\n\nhi('hello');",
      "code was incorrectly generated"
    );
  });

  test("identifierName", function () {
    let code = "function foo() { bar; }\n";

    let ast = parse(code, { filename: "inline" }).program;
    let fn = ast.body[0];

    let id = fn.id;
    id.name += "2";
    id.loc.identifierName = "foo";

    let id2 = fn.body.body[0].expression;
    id2.name += "2";
    id2.loc.identiferName = "bar";

    let generated = generate.default(ast, {
      filename: "inline",
      sourceFileName: "inline",
      sourceMaps: true
    }, code);

    chai.expect(generated.map).to.deep.equal({
      version: 3,
      sources: ["inline"],
      names: ["foo", "bar" ],
      mappings: "AAAA,SAASA,IAAT,GAAe;AAAEC;AAAM",
      sourcesContent: [ "function foo() { bar; }\n" ]
    }, "sourcemap was incorrectly generated");

    chai.expect(generated.code).to.equal(
      "function foo2() {\n  bar2;\n}",
      "code was incorrectly generated"
    );
  });
});


suite("programmatic generation", function() {
  test("numeric member expression", function() {
    // Should not generate `0.foo`
    let mem = t.memberExpression(t.numericLiteral(60702), t.identifier("foo"));
    new Function(generate.default(mem).code);
  });

  test("nested if statements needs block", function() {
    let ifStatement = t.ifStatement(
      t.stringLiteral("top cond"),
      t.whileStatement(
        t.stringLiteral("while cond"),
        t.ifStatement(
          t.stringLiteral("nested"),
          t.expressionStatement(t.numericLiteral(1))
        )
      ),
      t.expressionStatement(t.stringLiteral("alt"))
    );

    let ast = parse(generate.default(ifStatement).code);
    assert.equal(ast.program.body[0].consequent.type, "BlockStatement");
  });

  test("flow object indentation", function() {
    let objectStatement = t.objectTypeAnnotation(
      [
        t.objectTypeProperty(
          t.identifier("bar"),
          t.stringTypeAnnotation()
        ),
      ],
      null,
      null
    );

    let output = generate.default(objectStatement).code;
    assert.equal(output, [
      "{",
      "  bar: string;",
      "}",
    ].join("\n"));
  });
});

suite("whitespace", function () {
  test("empty token list", function () {
    let w = new Whitespace([]);
    assert.equal(w.getNewlinesBefore(t.stringLiteral("1")), 0);
  });
});

let suites = require("babel-helper-fixtures").default(__dirname + "/fixtures");

suites.forEach(function (testSuite) {
  suite("generation/" + testSuite.title, function () {
    _.each(testSuite.tests, function (task) {
      test(task.title, !task.disabled && function () {
        let expect = task.expect;
        let actual = task.actual;

        let actualAst = parse(actual.code, {
          filename: actual.loc,
          plugins: [
            "jsx",
            "flow",
            "decorators",
            "asyncFunctions",
            "exportExtensions",
            "functionBind",
            "classConstructorCall",
            "classProperties",
          ],
          strictMode: false,
          sourceType: "module",
        });

        let actualCode = generate.default(actualAst, task.options, actual.code).code;
        chai.expect(actualCode).to.equal(expect.code, actual.loc + " !== " + expect.loc);
      });
    });
  });
});