Question

我有一个失败的Jasmine测试，因为正在生成一个随机数，这个随机值对于执行和规范是不同的。

fetch: function(options) {
    if(typeof options === "undefined") {
        options = {};
    }
    if(typeof options.data === "undefined") {
        options.data = {};
    }
    options.data.id = this.journalId;
    options.data.random = Math.floor(Math.random()*10000);
    col.prototype.fetch.call(this, options);
}

下面的测试失败，因为Math.floor(Math.random()*10000)生成了不同的值。

it("should call parent fetch with default options", function() {
  this.collection.fetch();
  expect(this.fetchSpy).toHaveBeenCalledWith({
    data: {
      id: 1,
      random: Math.floor(Math.random()*10000) 
    }
  }); 
});

有没有办法让我的测试通过我生成随机数的情况？

Answer 1

您可以模拟Math.random功能。茉莉花2：

it("should call parent fetch with default options", function() {
  spyOn(Math, 'random').and.returnValue(0.1);
  this.collection.fetch();
  expect(this.fetchSpy).toHaveBeenCalledWith({
    data: {
      id: 1,
      random: Math.floor(Math.random()*10000)
    }
  }); 
});

Jasmine 1：

it("should call parent fetch with default options", function() {
  jasmine.spyOn(Math, 'random').andReturn(0.1);
  this.collection.fetch();
  expect(this.fetchSpy).toHaveBeenCalledWith({
    data: {
      id: 1,
      random: Math.floor(Math.random()*10000)
    }
  }); 
});

Answer 2

你不应该spyOn import java.awt.BorderLayout; import java.awt.CardLayout; import java.awt.EventQueue; import java.awt.Font; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTabbedPane; import javax.swing.JTextArea; import javax.swing.SwingConstants; public class PizzaSystem { private JFrame frame; // Toppings toppingsPanel; MainMenu menuPanel; JButton loginBtn; JPanel mainPanel; CardLayout cl; //MAIN public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { PizzaSystem window = new PizzaSystem(); window.frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } //Constructor public PizzaSystem() { initialize(); } //Initialize the GUI private void initialize() { cl = new CardLayout(); frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); mainPanel = new JPanel(cl); frame.getContentPane().add(mainPanel); JPanel panel_1 = new JPanel(new GridBagLayout()); loginBtn = new JButton(); loginBtn.setText("Login"); loginBtn.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { showCard("menu"); } }); panel_1.add(loginBtn); mainPanel.add(panel_1, "loginPanel"); JPanel menuPanel = new MainMenu(); mainPanel.add(menuPanel, "menu"); frame.pack(); showCard("loginPanel"); } //Call card matching the key public void showCard(String key) { cl.show(mainPanel, key); } public class MainMenu extends JPanel { public MainMenu() { JPanel panel1 = new JPanel(new BorderLayout()); JLabel logoLabel = new JLabel("Logo"); panel1.add(logoLabel, BorderLayout.NORTH); JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP); tabbedPane.setToolTipText(""); panel1.add(tabbedPane, BorderLayout.CENTER); JPanel panel = new JPanel(); tabbedPane.addTab("MENU", null, panel, null); //******************************************************************************************************* //Pepperoni menu section JLabel pizza1Image = new JLabel("IMAGE"); panel.add(pizza1Image); JLabel pepperoniLabel = new JLabel("PEPPERONI"); pepperoniLabel.setHorizontalAlignment(SwingConstants.CENTER); panel.add(pepperoniLabel); JButton pepperoniOrderBtn = new JButton("ORDER"); pepperoniOrderBtn.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { } }); //Pepperoni End JButton accountButton = new JButton("Account"); panel.add(accountButton); JButton checkoutButton = new JButton("Checkout"); panel.add(checkoutButton); JButton logoutButton = new JButton("Logout"); panel.add(logoutButton); JTextArea txtrOrderInfoGoes = new JTextArea(10, 20); txtrOrderInfoGoes.setText("Order Info\r\nGoes Here\r\n\r\nPepperoni Pizza x1\r\n$6.50"); panel.add(txtrOrderInfoGoes); JButton clearOrderButton = new JButton("Clear"); panel.add(clearOrderButton); JLabel titleLabel = new JLabel("MAMA JANE'S PIZZERIA"); panel.add(titleLabel); titleLabel.setFont(new Font(titleLabel.getFont().getName(), Font.PLAIN, 50)); JLabel storeInfoLabel = new JLabel("<html>1234 Fakelane Rd <br> 10001, Faketopia, USA <br> 111-11-PIZZA <br> Mon-Fri 11AM to 10pm <br> Sat-Sun 10AM to 11pm"); panel.add(storeInfoLabel); JScrollPane scrollPane = new JScrollPane(); panel.add(scrollPane); logoutButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.exit(0); } }); add(panel1); } } }。

有很多包使用这个功能（甚至Jasmine），更好的方法是编写一个方法来包装随机的东西。

Math.random

现在你可以模拟它了！

class Fetcher {
  fetch(url) {
    const rand = this.generateRandomNumber(64);
    // ...
  }

  generateRandomNumber(n) {
    return Math.floor(Math.random() * n);
  }
}

Answer 3

如果你想模拟一系列＆＃34;随机＆＃34;值，您可以使用：

spyOn(Math, 'random').and.returnValues(0.1, 0.2, 0.3, 0.4);

请注意，您必须在returnValue s 中添加 s ，否则它将无法正常工作

Jasmine规范生成不同的随机数而不是执行

3 个答案: