For a more complete example consider a data integration system that loads data from flat files into a data mart.
Unit Testing Template For Etl Process Software Development LifecycleUnit testing has been accepted as a key part of the software development lifecycle for projects building applications in languages such as Java or C however I have rarely come across a SAP DataServices project where unit testing is treated as a fundamental part of the software development life cycle.As a result projects without rigorous unit testing spend longer than planned in system testing, identifying trivial defects, and as a result suffer from delays and cost overruns.This article first explains what is unit testing and what benefits it brings to a project and then looks at how to implementing automated unit testing in a SAP DataServices project.
Overview This article discusses an approach to unit testing in an SAP Data Services project. It reviews the objective and benefits of unit testing in software development and how this also applies to the data integration process of a data warehouse system. The second part of the article looks at how unit testing can be implemented in a SAP Data Services approach by looking at how to construct component based data integration code that can be unit tested and finally how to construct unit test suites. What Is Unit Testing In software engineering unit testing involves testing the individual units of the application as opposed to testing the application as a whole. This page is a list of tables of code-driven unit testing frameworks for various programming languages. More often we just ran the whole ETL process on a sample database and. What defines a unit varies depending on the software being built in Java, for example, a unit is typically a Java class. Essentially it is the smallest part of the application that can be tested in isolation. A unit test of a Java class would involve executing individual tests against each method and object defined by the class to ensure that they meet their intended functionality. As well as positive testing testing that the code meets the requirements unit testing also involves a degree of negative testing that tests that the code handles unexpected situations. For data integration code unit testing that the data is extracted as per requirement, all the required transformations that are required occur correctly and also that the data is loaded to the target data repository as expected. Unit testing then provides the confidence that each component of the system delivers its required functionality. In addition defects are spotted and resolved earlier in the development life cycle and unit testing also provides a degree of regression testing. Automation of unit testing is an essential requirement for agile development of a data warehouse and additional code or test frameworks are written to facilitate automated unit testing. Unit Testing Template For Etl Process Manual Testing ItNot only does automation execute the unit test much quicker than manual testing it also ensures that the unit tests are consistent between executions. Unit Testing in a Data Integration System In data warehousing, data integration is the system that is responsible for acquiring and loading data into the data warehouse. In data integration a unit of code would be any individual process that performs a single movement of data from a source of data to a target. Unit Testing Template For Etl Process Series Of DataFor example a unit would be a process that reads data from one a source followed by applying a series of data transformations and then finally writing the data to a target table or other output. Another example of a unit of code would be scripts that are written to support the data integration process. For example, a script that moves files on the file system or a script unzips a compressed file or a script that logs processing warnings and errors.
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