// Copyright 2016 The Chromium Authors. 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:flutter_gallery/demo/calculator/logic.dart'; import 'package:test/test.dart'; void main() { test('Test order of operations: 12 + 3 * 4 = 24', () { CalcExpression expression = new CalcExpression.Empty(); expression = expression.appendDigit(1); expression = expression.appendDigit(2); expression = expression.appendOperation(Operation.Addition); expression = expression.appendDigit(3); expression = expression.appendOperation(Operation.Multiplication); expression = expression.appendDigit(4); expression = expression.computeResult(); expect(expression.state, equals(ExpressionState.Result)); expect(expression.toString(), equals("24")); }); test('Test floating point 0.1 + 0.2 = 0.3', () { CalcExpression expression = new CalcExpression.Empty(); expression = expression.appendDigit(0); expression = expression.appendPoint(); expression = expression.appendDigit(1); expression = expression.appendOperation(Operation.Addition); expression = expression.appendDigit(0); expression = expression.appendPoint(); expression = expression.appendDigit(2); expression = expression.computeResult(); expect(expression.state, equals(ExpressionState.Result)); expect(expression.toString(), equals("0.3")); }); test('Test floating point 1.0/10.0 = 0.1', () { CalcExpression expression = new CalcExpression.Empty(); expression = expression.appendDigit(1); expression = expression.appendPoint(); expression = expression.appendDigit(0); expression = expression.appendOperation(Operation.Division); expression = expression.appendDigit(1); expression = expression.appendDigit(0); expression = expression.appendPoint(); expression = expression.appendDigit(0); expression = expression.computeResult(); expect(expression.state, equals(ExpressionState.Result)); expect(expression.toString(), equals("0.1")); }); test('Test 1/0 = Infinity', () { CalcExpression expression = new CalcExpression.Empty(); expression = expression.appendDigit(1); expression = expression.appendOperation(Operation.Division); expression = expression.appendDigit(0); expression = expression.computeResult(); expect(expression.state, equals(ExpressionState.Result)); expect(expression.toString(), equals("Infinity")); }); test('Test use result in next calculation: 1 + 1 = 2 + 1 = 3 + 1 = 4', () { CalcExpression expression = new CalcExpression.Empty(); expression = expression.appendDigit(1); expression = expression.appendOperation(Operation.Addition); expression = expression.appendDigit(1); expression = expression.computeResult(); expression = expression.appendOperation(Operation.Addition); expression = expression.appendDigit(1); expression = expression.computeResult(); expression = expression.appendOperation(Operation.Addition); expression = expression.appendDigit(1); expression = expression.computeResult(); expect(expression.state, equals(ExpressionState.Result)); expect(expression.toString(), equals("4")); }); test('Test minus -3 - -2 = -1', () { CalcExpression expression = new CalcExpression.Empty(); expression = expression.appendMinus(); expression = expression.appendDigit(3); expression = expression.appendMinus(); expression = expression.appendMinus(); expression = expression.appendDigit(2); expression = expression.computeResult(); expect(expression.state, equals(ExpressionState.Result)); expect(expression.toString(), equals("-1")); }); }