test/to_string_test.dart

// Copyright (c) 2016, 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:test/test.dart';

import 'package:boolean_selector/boolean_selector.dart';

void main() {
  group("toString() for", () {
    test("a variable is its name", () {
      _expectToString("foo");
      _expectToString("a-b");
    });

    group("not", () {
      test("doesn't parenthesize a variable", () => _expectToString("!a"));
      test("doesn't parenthesize a nested not", () => _expectToString("!!a"));
      test("parenthesizes an or", () => _expectToString("!(a || b)"));
      test("parenthesizes an and", () => _expectToString("!(a && b)"));
      test("parenthesizes a condition", () => _expectToString("!(a ? b : c)"));
    });

    group("or", () {
      test("doesn't parenthesize variables", () => _expectToString("a || b"));
      test("doesn't parenthesize nots", () => _expectToString("!a || !b"));

      test("doesn't parenthesize ors", () {
        _expectToString("a || b || c || d");
        _expectToString("((a || b) || c) || d", "a || b || c || d");
      });

      test("parenthesizes ands",
          () => _expectToString("a && b || c && d", "(a && b) || (c && d)"));

      test("parenthesizes conditions",
          () => _expectToString("(a ? b : c) || (e ? f : g)"));
    });

    group("and", () {
      test("doesn't parenthesize variables", () => _expectToString("a && b"));
      test("doesn't parenthesize nots", () => _expectToString("!a && !b"));

      test(
          "parenthesizes ors",
          () =>
              _expectToString("(a || b) && (c || d)", "(a || b) && (c || d)"));

      test("doesn't parenthesize ands", () {
        _expectToString("a && b && c && d");
        _expectToString("((a && b) && c) && d", "a && b && c && d");
      });

      test("parenthesizes conditions",
          () => _expectToString("(a ? b : c) && (e ? f : g)"));
    });

    group("conditional", () {
      test(
          "doesn't parenthesize variables", () => _expectToString("a ? b : c"));

      test("doesn't parenthesize nots", () => _expectToString("!a ? !b : !c"));

      test("doesn't parenthesize ors",
          () => _expectToString("a || b ? c || d : e || f"));

      test("doesn't parenthesize ands",
          () => _expectToString("a && b ? c && d : e && f"));

      test("parenthesizes non-trailing conditions", () {
        _expectToString("(a ? b : c) ? (e ? f : g) : h ? i : j");
        _expectToString("(a ? b : c) ? (e ? f : g) : (h ? i : j)",
            "(a ? b : c) ? (e ? f : g) : h ? i : j");
      });
    });
  });
}

void _expectToString(String selector, [String result]) {
  if (result == null) result = selector;
  expect(_toString(selector), equals(result),
      reason: 'Expected toString of "$selector" to be "$result".');
}

String _toString(String selector) =>
    new BooleanSelector.parse(selector).toString();