What is Codeium and How to Use it for Test Case Writing

Codeium to write test cases for your methods by following the below steps.

Step 1. Create an xUnit test case project in Visual Studio and add the Calculator.cs file and methods in it as below.

namespace CodeiumTestProject
{
    public class Calculator
    {
        public int Add(int a, int b)
        {
            return a + b;
        }
        public int Subtract(int a, int b)
        {
            return a - b;
        }
        public int Multiply(int a, int b)
        {
            return a * b;
        }
        public double Divide(int a, int b)
        {
            if (b == 0)
            {
                throw new DivideByZeroException("Cannot divide by zero");
            }
            return (double)a / b;
        }
    }
}

Step 2. Open the Calculator.cs file, and you will see Codeium annotations above the class name and method names.

It will give you various options once you click on it, that is Refactor, Explain, and Generate Docstring. Select the Explain option, and it will open.

The Codeium Chat toolbox with an explanation of the Add method as below.

Select the Generate Docstring option, and it will open the Codeium Chat toolbox with the generated Docstring of the Add method with the option you can.

Manually copy and paste or click on Insert as below.

Step 3. Next, right-click on the Add method and you will see the menu below with Codeium options.

Step 4. Select the option Codeium: Generate Unit Test for Function, and it will analyze your code and open the Codeium Chat toolbox.

Generate test cases based on your logic with various scenarios as below.

Step 5. Create a test file named CalculatorTest.cs then copy and paste the generated test cases using Codeium in the file as below.

namespace CodeiumTestProject
{
    public class CalculatorTest
    {
        [Fact]
        public void Add_ReturnsSumOfTwoNumbers()
        {
            // Arrange
            Calculator calculator = new Calculator();

            // Act
            int result = calculator.Add(2, 3);

            // Assert
            Assert.Equal(5, result);
        }
        [Fact]
        public void Add_ReturnsZeroForZeroInputs()
        {
            // Arrange
            Calculator calculator = new Calculator();

            // Act
            int result = calculator.Add(0, 0);

            // Assert
            Assert.Equal(0, result);
        }
        [Fact]
        public void Add_ReturnsPositiveNumberForPositiveInputs()
        {
            // Arrange
            Calculator calculator = new Calculator();

            // Act
            int result = calculator.Add(2, 3);

            // Assert
            Assert.True(result > 0);
        }
        [Fact]
        public void Add_ReturnsNegativeNumberForNegativeInputs()
        {
            // Arrange
            Calculator calculator = new Calculator();
            // Act
            int result = calculator.Add(-2, -3);
            // Assert
            Assert.True(result < 0);
        }
    }
}

Step 6. Finally, go to the Test Explorer and run the tests generated by Codeium as below.

Conclusion

In this article, we learned about Codeium, its features, and installing, and generating unit test cases for your method. If you have any suggestions or queries regarding this article, please contact me.

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