What is the maintenance cost of C++ functional unit testing?

In C, the maintenance cost of unit testing mainly comes from code changes, dependency changes and the increase in the number of tests. To mitigate these costs, the following strategies can be adopted: 1. Use stubs and mocks; 2. Automate test case generation; 3. Focus on test design; 4. Review tests regularly.

Maintenance Cost of Unit Testing in C

Unit testing in C is crucial as it ensures the quality of the code and reliability. However, as the code base grows, the cost of maintaining unit tests can become an issue.

The root cause of maintenance costs

The maintenance cost of unit testing mainly comes from the following factors:

• Code changes:Changes to production code require corresponding unit test modifications to ensure that the tests are still valid.
• Dependency changes: Unit tests usually depend on the code under test. When the code under test changes, the unit tests also need to be updated.
• Number of tests: As the code base grows, the number of unit tests also increases, causing maintenance and updates to take longer.

Strategies to reduce maintenance costs

In order to reduce the maintenance cost of unit testing, the following strategies can be adopted:

• Use stubs and simulations: Stubs and simulations can isolate the code under test from dependencies and reduce the coupling of tests.
• Automated test case generation: By using code generation tools, test cases can be automatically generated and updated, saving time and effort.
• Focus on test design: Design tests that are easy to understand and maintain, and can flexibly respond to code changes.
• Review tests regularly: Review and update unit tests regularly to ensure they are up to date and effective.

Practical case

Consider the following C test code:

TEST_F(MathTest, Add) {
  EXPECT_EQ(2, Add(1, 1));
}

When the Add() function changes , the corresponding test cases also need to be updated. For example, if the Add() function now returns Sum, the test case needs to be rewritten as:

TEST_F(MathTest, Add) {
  EXPECT_EQ(Sum(1, 1), Add(1, 1));
}

By using stubs, it is possible to isolate unit tests and Sum( ) function, thus making test cases more flexible and easier to maintain.

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