How to Write Unit Tests in Microsoft Dynamics AX Using SysTest

Microsoft Dynamics AX is widely used for enterprise resource planning. SysTest is its built-in framework for writing unit tests. In July 2025, Microsoft updated SysTest with better debugging, easier test isolation, and improved performance monitoring. These changes make testing faster and more reliable.

This guide will help you understand the process step by step. You will also see examples, benefits, and the latest best practices. Whether you are new to unit testing or have experience, this article will help you create effective tests in AX.

Table of Contents

1.    Key Concepts of Unit Tests in AX

2.    Differences Between Old and New SysTest Features

3.    Step-by-Step Guide to Writing Unit Tests in AX

4.    Examples of SysTest Unit Tests

5.    Benefits of Using SysTest in Dynamics AX

6.    FAQs

1. Key Concepts of Unit Tests in AX

Unit tests are small, focused tests that check one part of your code. They ensure your code works as expected without running the full application.

In Microsoft Dynamics AX, SysTest is the default unit testing framework. It helps developers write, run, and verify tests directly inside AX.

Some important terms:

• Test Method – A method that checks a specific function.
• Test Class – A container for related test methods.
• Assertions – Statements that verify expected results.

If you are new to this, you can explore MicroSoft Dynamics Ax Technical Training to build a strong foundation before starting with SysTest.

2. Differences Between Old and New SysTest Features

The July 2025 update made several improvements:

• Faster Test Runs – Parallel execution speeds up large test suites.
• Better Isolation – Tests can now run without shared data interference.
• Improved Reporting – Test results now show detailed performance stats.

Earlier versions required manual cleanup of test data. Now, automatic rollback happens after each test run. This reduces errors and saves time.

3. Step-by-Step Guide to Writing Unit Tests in AX

Step 1 – Create a Test Project

1.    Open AX development workspace.

2.    Create a new project for your unit tests.

3.    Keep it separate from production code for clarity.

Step 2 – Create a Test Class

1.    Right-click the project.

2.    Select New > Class.

3.    Name it with a “Test” suffix, e.g., SalesOrderTest.

Step 3 – Add SysTest Attributes

• Add [SysTestMethod] above methods that you want to test.
• Add [SysTestClass] to mark the class as a test class.

Step 4 – Write Test Methods

• Keep each test small and focused.
• Use assertEquals() to check expected values.

Example:

[SysTestClass]

class SalesOrderTest

{

    [SysTestMethod]

    public void testSalesOrderCreation()

    {

        SalesOrder so = new SalesOrder();

        so.create();

        this.assertEquals(true, so.isCreated());

    }

}

Step 5 – Run Tests

• Go to the Unit Test menu.
• Select your test project.
• Review results in the SysTest result pane.

If you want more detailed guidance, Microsoft Dynamics 365 Training Courses often include full SysTest sessions.

4. Examples of SysTest Unit Tests

Here is a simple example testing a calculation:

[SysTestClass]

class PriceCalculationTest

{

    [SysTestMethod]

    public void testDiscountCalculation()

    {

        PriceCalc calc = new PriceCalc();

        real price = calc.applyDiscount(100, 10);

        this.assertEquals(90, price);

    }

}

This test confirms that a 10% discount on 100 returns 90. Short and clear tests like this help maintain accuracy in business logic.

5. Benefits of Using SysTest in Dynamics AX

Using SysTest gives several advantages:

• Early Error Detection – Bugs are found before deployment.
• Better Code Quality – Ensures business logic is correct.
• Faster Development – Automated tests save rework time.
• Easy Maintenance – Clear tests act as documentation.

The latest update in July 2025 added more robust error tracking. Now, failed tests show exact lines of code with performance metrics.

If you want hands-on learning, MicroSoft Dynamics Ax Technical Training covers SysTest in depth with real projects.

FAQs

Q1. How to write unit tests effectively?

Write small, independent tests. Focus on one function per test. Use clear names. Visualpath training institute recommends keeping test data minimal to avoid complexity.

Q2. Which framework is best for unit testing?

For Microsoft Dynamics AX, SysTest is best because it is built-in and updated regularly. It integrates with the AX environment directly.

Q3. How to write effective test cases with examples?

Start with simple scenarios, then test edge cases. For example, test discount calculation with zero, positive, and maximum values. Microsoft Dynamics 365 Training Courses usually provide such case studies.

Q4. What are the 3 A's of unit testing?

Arrange, Act, and Assert. Arrange data, act by calling the method, then assert the results. Visualpath training institute uses this method in its sessions for clarity.

Final Words

This step-by-step process ensures your code in AX is reliable. By using the latest SysTest features, you can detect issues earlier, improve quality, and maintain your ERP solutions with confidence.

If you practice regularly and follow these structured steps, writing unit tests in AX will become second nature.

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