pkg/analysis_server/test/src/services/correction/fix/replace_with_tear_off_test.dart

// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:analysis_server/src/services/correction/fix.dart';
import 'package:analysis_server/src/services/linter/lint_names.dart';
import 'package:analyzer_plugin/utilities/fixes/fixes.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';

import 'fix_processor.dart';

void main() {
  defineReflectiveSuite(() {
    defineReflectiveTests(ReplaceWithTearOffBulkTest);
    defineReflectiveTests(ReplaceWithTearOffTest);
  });
}

@reflectiveTest
class ReplaceWithTearOffBulkTest extends BulkFixProcessorTest {
  @override
  String get lintCode => LintNames.unnecessary_lambdas;

  Future<void> test_singleFile() async {
    await resolveTestCode('''
Function f() => (name) {
  print(name);
};

void foo(){}
Function f2() {
  return () {
    foo();
  };
}
''');
    await assertHasFix('''
Function f() => print;

void foo(){}
Function f2() {
  return foo;
}
''');
  }
}

@reflectiveTest
class ReplaceWithTearOffTest extends FixProcessorLintTest {
  @override
  FixKind get kind => DartFixKind.REPLACE_WITH_TEAR_OFF;

  @override
  String get lintCode => LintNames.unnecessary_lambdas;

  Future<void> test_constructorTearOff_named() async {
    await resolveTestCode('''
class C {
  int c;
  C.create([this.c = 3]);
}

void f() {
  var listOfInts = [1, 2, 3];
  for (var c in listOfInts.map((x) => C.create(x))) {
    print(c.c);
  }
}
''');
    await assertHasFix('''
class C {
  int c;
  C.create([this.c = 3]);
}

void f() {
  var listOfInts = [1, 2, 3];
  for (var c in listOfInts.map(C.create)) {
    print(c.c);
  }
}
''');
  }

  Future<void> test_constructorTearOff_nameUnnamed() async {
    await resolveTestCode('''
class C {
  int c;
  C([this.c = 3]);
}

void f() {
  var listOfInts = [1, 2, 3];
  for (var c in listOfInts.map((x) => C.new(x))) {
    print(c.c);
  }
}
''');
    await assertHasFix('''
class C {
  int c;
  C([this.c = 3]);
}

void f() {
  var listOfInts = [1, 2, 3];
  for (var c in listOfInts.map(C.new)) {
    print(c.c);
  }
}
''');
  }

  Future<void> test_constructorTearOff_oneParameter() async {
    await resolveTestCode('''
class C {
  int c;
  C([this.c = 3]);
}

void f() {
  var listOfInts = [1, 2, 3];
  for (var c in listOfInts.map((x) => C(x))) {
    print(c.c);
  }
}
''');
    await assertHasFix('''
class C {
  int c;
  C([this.c = 3]);
}

void f() {
  var listOfInts = [1, 2, 3];
  for (var c in listOfInts.map(C.new)) {
    print(c.c);
  }
}
''');
  }

  Future<void> test_constructorTearOff_zeroParameters() async {
    await resolveTestCode('''
typedef Maker = Object Function();

class C {
  int c;
  C([this.c = 3]);
}

var l = <Maker>[
  () => C(),
];
''');
    await assertHasFix('''
typedef Maker = Object Function();

class C {
  int c;
  C([this.c = 3]);
}

var l = <Maker>[
  C.new,
];
''');
  }

  Future<void> test_function_oneParameter() async {
    await resolveTestCode('''
Function f() => (name) {
  print(name);
};
''');
    await assertHasFix('''
Function f() => print;
''');
  }

  Future<void> test_function_zeroParameters() async {
    await resolveTestCode('''
void foo(){}
Function finalVar() {
  return () {
    foo();
  };
}
''');
    await assertHasFix('''
void foo(){}
Function finalVar() {
  return foo;
}
''');
  }

  Future<void> test_lambda_asArgument() async {
    await resolveTestCode('''
void foo() {
  bool isPair(int a) => a % 2 == 0;
  final finalList = <int>[];
  finalList.where((number) =>
    isPair(number));
}
''');
    await assertHasFix('''
void foo() {
  bool isPair(int a) => a % 2 == 0;
  final finalList = <int>[];
  finalList.where(isPair);
}
''');
  }

  Future<void> test_method_oneParameter() async {
    await resolveTestCode('''
final l = <int>[];
var a = (x) => l.indexOf(x);
''');
    await assertHasFix('''
final l = <int>[];
var a = l.indexOf;
''');
  }

  Future<void> test_method_zeroParameter() async {
    await resolveTestCode('''
final Object a = '';
Function finalVar() {
  return () {
    return a.toString();
  };
}
''');
    await assertHasFix('''
final Object a = '';
Function finalVar() {
  return a.toString;
}
''');
  }
}