logic.dart 3.7 KB
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// 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.

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import 'package:flutter_gallery/demo/calculator/logic.dart';
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import 'package:test_api/test_api.dart' hide TypeMatcher, isInstanceOf;
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void main() {
  test('Test order of operations: 12 + 3 * 4 = 24', () {
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    CalcExpression expression = CalcExpression.empty();
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    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));
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    expect(expression.toString(), equals('24'));
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  });

  test('Test floating point 0.1 + 0.2 = 0.3', () {
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    CalcExpression expression = CalcExpression.empty();
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    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));
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    expect(expression.toString(), equals('0.3'));
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  });

  test('Test floating point 1.0/10.0 = 0.1', () {
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    CalcExpression expression = CalcExpression.empty();
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    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));
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    expect(expression.toString(), equals('0.1'));
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  });

  test('Test 1/0 = Infinity', () {
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    CalcExpression expression = CalcExpression.empty();
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    expression = expression.appendDigit(1);
    expression = expression.appendOperation(Operation.Division);
    expression = expression.appendDigit(0);
    expression = expression.computeResult();
    expect(expression.state, equals(ExpressionState.Result));
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    expect(expression.toString(), equals('Infinity'));
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  });

  test('Test use result in next calculation: 1 + 1 = 2 + 1 = 3 + 1 = 4', () {
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    CalcExpression expression = CalcExpression.empty();
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    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));
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    expect(expression.toString(), equals('4'));
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  });

  test('Test minus -3 - -2 = -1', () {
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    CalcExpression expression = CalcExpression.empty();
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    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));
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    expect(expression.toString(), equals('-1'));
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  });
}