Integration (5/11/2017)

Testing Principles

Testing Roles and Responsibilities

FUNCTIONAL & REGRESSION TESTING

Functional Testing - when new features & use cases are introduced that the existing use cases are enhanced to be compatible with the new functionality. For example, if enhancements were needed in the VCPE or VOLTE U/C to upgrade the PNF support introduced in R4 Dublin. ("Dictionary" Definition) Functional testing is a software testing process used within software development in which software is tested to ensure that it conforms with all requirements. Functional testing is a way of checking software to ensure that it has all the required functionality that's specified within its functional requirements.

Regression Testing - when new features & use cases are introduced doesn't break existing use cases. For example, if PNF onboarding/onboarding (PNF package) U/C introduced in R4 Dublin didn't break the functionality of VCPE or VOLTE. ("Dictionary" Definition) Regression testing is re-running functional and non-functional tests to ensure that previously developed and tested software still performs after a change. Changes that may require regression testing include bug fixes, software enhancements, configuration changes, and even substitution of electronic components. As regression test suites tend to grow with each found defect, test automation is frequently involved. Sometimes a change impact analysis is performed to determine an appropriate subset of tests (non-regression analysis).

Integration Testing - testing which brings together the platform components and new development to realize a use case. For example, testing centered around making sure that the SDC, A&AI, SO, VID, etc components work together to deliver the BBS Use Case. ONAP has a Integration Project, there is a dedicate team who is coordinating the integration efforts. Additional, each of the Use Cases are discussing have "roadmap" their integration work. ("Dictionary" Definition) Integration testing is a software testing methodology used to test individual software components or units of code to verify interaction between various software components and detect interface defects. Components are tested as a single group or organized in an iterative manner. After the integration testing has been performed on the components, they are readily available for system testing.

TESTING CONCERNS:

LIMITED RESOURCES - the Integration project (test team) in ONAP is a small team, which will depend on automation as much as possible to try to cover the Regression and Functional testing aspects as much as possible.

RELEASE RISK - there is obviously a risk adding new software without regression and functional testing, in that a lot of integration testing (from R3) was done to make sure that new U/C introduced in R3 worked properly, and now introducing new U/C, functionality, and requirements could potentially break that already tested & working software.

AUTOMATION - it is desirable to have as much automation as possible in testing so that tests can be re-run so that functionality can be re-checked in the current release when new functionality is introduced.

LAB ENVIRONMENT - U/C were developed in particular environments, the xNFs are installed in a particular environment, and these environments change over time. Limitations need to be identified with additional equipment or new equipment etc.

Typical Software Industry Testing Process. ONAP Development & Integration testing can consider and incorporate some of the key concepts with a "typical" software industry testing process to insure quality software is delivered for the Use Case development:

End-to-End Test Cases

• VoLTE

- VoLTEservice design and creation: VNFs, network resource, workflow, alarms, DGs, DCAE template are onboarded. VoLTE e2e network service, including the connectivity between data centers, are designed and distributed successfully

- Close loop design: DCAE threshold crossing rules, Holmes correlation rules, and operation policy are designed and distributed by CLAMP successfully

- Instantiation: VNFs are deployed in edge and core data centers successfully, underlay and overlay WAN network cross the two data centers is setup correctly

- Auto-healing/auto-scaling: With event data from VIM or VNF, certain auto-healing/auto-scaling policy is triggered and proper actions are taken to remedy the situation

- Service termination: After user terminates the VoLTE service, VNFs and related resource for the service are properly removed, and WAN connectivity between the two data center is also removed successfully.          

• Residential vCPE use case

- Design time: All the VPP-based VNFs are successfully onboarded.

- Design time: Infrastructure and per-customer service are created. Associated workflows, policies, DGs, and data analytics created, validated, and properly distributed

- Instantiation: Infrastructure service is instantiated and properly configured. This is performed only once.

- Customer order: Per-customer service is instantiated and properly configured. This is performed on-demand.

- Data plane: Once a customer service is up and running, packets can be exchanged between the customer BRG emulator and the webserver.

- Auto-healing: Inject a packet loss event to invoke threshold crossing event, which then causes APPC to restart the vG_MUX VM. Service is back to normal once restart is complete.

Testing Terminology

• Unit Testing (UT) – Unit testing focuses on individual software components or modules. Typically, UT is done by the programmers and not by testers, as it requires detailed knowledge of the internal program design and code; UT may require developing test driver modules or test harnesses. Code coverage is also one of the objectives of UT.
• Feature/Functional Testing – Feature/Functional testing, unlike unit testing, focuses on the output as defined per requirement (user story). This type of testing is black-box type testing, geared towards functional requirements on an application basis.
• Integration/Pair-Wise Testing – Integration/Pair-wise testing integrates all of the modules of the solution in a single environment to verify combined functionality after integration. It ensures everything comes together and there is end-to-end communications between all the integrated elements.
• End-to-End Testing – End-to-End testing involves testing of a complete application environment in scenarios that closely mimic real-world use, such as interacting with a database, using network communications, or interacting with other hardware, applications, or systems, if appropriate.
• Regression Testing – Testing the application as a whole for the modification in any module or functionality. Typically, automation tools are used for regression testing since it is difficult to cover all aspects of the system in a manual fashion.
• Performance Testing – Performance testing tests the solution to see what throughput levels can be achieved based on the given platform. Performance testing term is often used interchangeably with ‘stress’ testing (pushes the system beyond its specifications to check how and when it fails) and ‘load’ testing (which checks the system behavior under steady load.). An objective of this testing is to verify that the system meets performance requirements. Different performance and load tools  are used for this type of testing. [Note: Capacity testing and performance testing are closely aligned. Capacity testing tests against product requirements to ensure the system meets requirements. Performance testing pushes the system to highest numbers it can achieve before it becomes unstable or success rate is unacceptable.]
• Acceptance Testing – Normally this type of testing is done to verify if system meets the customer specified requirements. User or customer do this testing to determine whether to accept application.
• Usability Testing – Usability testing is focused on testing of user interfaces (UI’s). It checks user-friendliness along with application flows; e.g., can new users understand the application easily, is proper help documented whenever users get stuck at any point, etc…. Basically system navigation is checked in this testing.
• Install/Uninstall Testing – This category of testing validates full or partial install/uninstall, and upgrade and rollback processes on different operating systems under different hardware, software environment including backup/restore mechanisms.
• Recovery Testing – This category of testing validates how well a system recovers from crashes, hardware failures, or other catastrophic problems in various configurations such as HA and Geo-Redundancy.
• Security Testing – Security testing looks for vulnerabilities in the software that would make the system susceptible to malicious users.  It tests how well the system is protected against unauthorized internal or external access. It checks if system and databases are safe from external attacks.
• Stability Testing – This type of testing validates that the system can run in steady state for an extended period of time without any system downtime or crashes. Typical stability test is run for 72hrs. If any problems are encountered during the stability test, such as application crash, high failure rates, the test is stopped and issue is investigated. The stability test is restarted after a fix is identified.
• Scalability Testing – This type of testing is an extension of performance testing. The purpose of scalability testing is to validate that the system can scale efficiently by identifying major workloads and mitigate bottlenecks that can impede the scalability of the application.
• Application Testing – Tests the platform in the context of  a particular application.