# The Math Function Unit Testing Design Pattern – Introduction

I have just posted The Math Function Unit Testing Design Pattern on my GitHub blog.

## Here is the introduction…

This article provides an overview of a new design pattern for unit testing in any programming language, ‘The Math Function Unit Testing Design Pattern’. The data-driven design pattern involves repeatable, automated testing, and minimises unit test code (see example) by delegating to library modules the unit test driver, reading/writing of test data and assertion and formatting of results.

After a section on the background, the article describes the design pattern in two parts: the first deals with the concepts of transactions and APIs and why we should base our unit testing around APIs, while the second describes the design pattern at high level.

There are modules in Oracle PL/SQL, JavaScript, Powershell and Python implementing utilities to support the design pattern, and demonstrating its use. A final section provides links to their GitHub projects and some related articles.

Infographic: The Bauhaus, Where Form Follows Function

## Wrapper Function – Purely_Wrap_All_Nets

Go to source location
Here is the complete function:

```FUNCTION Purely_Wrap_All_Nets(
p_inp_3lis                     L3_chr_arr)   -- input list of lists (group, record, field)
RETURN                         L2_chr_arr IS -- output list of lists (group, record)
l_act_2lis        L2_chr_arr := L2_chr_arr();
l_csr             SYS_REFCURSOR;
BEGIN
FOR i IN 1..p_inp_3lis(1).COUNT LOOP
INSERT INTO network_links VALUES (p_inp_3lis(1)(i)(1), p_inp_3lis(1)(i)(2), p_inp_3lis(1)(i)(3));
END LOOP;
l_act_2lis.EXTEND;
OPEN l_csr FOR SELECT * FROM TABLE(Net_Pipe.All_Nets);
l_act_2lis(1) := Utils.Cursor_To_List(x_csr    => l_csr);
ROLLBACK;
RETURN l_act_2lis;
END Purely_Wrap_All_Nets;
```

This is a good example of how little code may be necessary when following The Math Function Unit Testing Design Pattern: The complexity of the code reflects only the complexity of the external interface. Here, there are single input and output groups, and so the code is equally simple, despite the unit under test having a larger degree of internal complexity.

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