DAX Summary Table for Products by Color and Total Sales Analysis

Code Snippet Analysis

The provided DAX code snippet aims to create a summary table that groups products by color and calculates the total sales for products with a size of "M".

Test Case Development

1. Essential Functionality Test:

   • Check if the summary table is correctly grouped by product color.
   • Verify that total sales are calculated accurately for products with a size of "M".

2. Boundary Case Test:

   • Test the scenario where there are no products with a size of "M".
   • Verify the behavior when there are products of all available colors.

3. Edge Scenario Test:

   • Test the case where multiple products have the same color.
   • Check the performance with a large dataset of products.
   • Verify the behavior when other filters are applied alongside the size filter.

Assertion Implementation

Test 1: Essential Functionality Test

EVALUATE
ROW (
    "TestResult", COUNTROWS (
        SUMMARIZECOLUMNS (
            'Product'[Color],
            "Total Sales", CALCULATE ( [Total Sales], 'Product'[Size] = "M" )
        )
    ) = COUNTROWS('Product') && 
    ISEMPTY(FILTER('Product', 'Product'[Size] = "M"))
)

Test 2: Boundary Case Test

EVALUATE
ROW (
    "TestResult", COUNTROWS (
        SUMMARIZECOLUMNS (
            'Product'[Color],
            "Total Sales", CALCULATE ( [Total Sales], 'Product'[Size] = "M" )
        )
    ) > 0
)

Test 3: Edge Scenario Test

EVALUATE
ROW (
    "TestResult", COUNTROWS (
        SUMMARIZECOLUMNS (
            'Product'[Color],
            "Total Sales", CALCULATE ( [Total Sales], 'Product'[Size] = "M" )
        )
    ) > 0
)

By following these unit tests in DAX, developers can verify the correctness and reliability of the provided code snippet, ensuring that it functions as intended under various scenarios. This approach can significantly aid in automating the validation process and improving code quality.