What is the functionality of the DELETE operator in SQL queries?

The process of planning testing in a project in C# usually starts with defining requirements and key usage scenarios. Then, functionality is broken down into modules, and a list of test cases covering both positive and negative scenarios is created.

Implementation of testing includes:

• Writing unit tests using frameworks like NUnit or xUnit.
• Using mocks and stubs to isolate components (e.g., with Moq).
• Automating test runs through CI/CD for timely verification after each commit.
• Adding integration and UI tests if necessary.

Example of a simple unit test with NUnit:

[Test]
public void Add_TwoNumbers_ReturnsSum()
{
    var calculator = new Calculator();
    var result = calculator.Add(2, 3);
    Assert.AreEqual(5, result);
}

This approach helps quickly identify errors and maintain code quality throughout the development cycle.