What should the integration test coverage of Java functions be?

The coverage goals of Java function integration testing include: 80% method coverage, 90% branch coverage, and 95% line coverage. Test cases should cover order processing under normal scenarios, boundary value cases, and abnormal conditions.

Integration Test Coverage Goals for Java Functions

Overview

Integration Testing It is a key step to verify whether the software components are working properly after integration. For Java functions, integration tests should measure the behavior of the function when interacting with other components. This article discusses coverage goals for Java function integration testing.

Code Coverage Goal

In integration testing, code coverage measures which part of the code base is executed by the test cases. For Java functions, target code coverage may vary depending on the complexity and criticality of the code base. In general, recommended coverage goals include:

• Method coverage: Cover at least 80% of methods, including public, protected, and private methods.
• Branch coverage: Cover at least 90% of branches, including if-else statements, loops, and other branches.
• Line coverage: Cover at least 95% of the lines of code.

Practical case

Suppose you are testing a Java function that handles orders. Integration test cases should cover the following scenarios:

// 测试正常订单处理
void testProcessOrder_normal() {
    // 创建订单对象
    Order order = new Order("ITEM1", 10);
    // 调用函数
    processOrder(order);
    // 断言订单已成功处理
}

// 测试边界值订单处理
void testProcessOrder_boundaryValues() {
    // 创建具有极端值（0、最大值）数量的订单对象
    Order order1 = new Order("ITEM1", 0);
    Order order2 = new Order("ITEM1", Integer.MAX_VALUE);
    // 调用函数
    processOrder(order1);
    processOrder(order2);
    // 断言函数在边界值情况下处理正确
}

// 测试异常条件下的订单处理
void testProcessOrder_exception() {
    // 创建导致异常的订单对象
    Order order = null;
    // 调用函数
    try {
        processOrder(order);
        fail("An exception was expected.");
    } catch (Exception e) {
        // 断言抛出了预期的异常
    }
}

Conclusion

By setting clear code coverage goals and creating comprehensive test cases, you can ensure that your Java function integration tests are effective Verify the interaction of software components. Following the recommended goals and implementing practical examples will help you develop reliable, robust applications.

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