- Cloud testing
Cloud testing is a form of software testing in which web applications use cloud computing environments (a "cloud") to simulate real-world user traffic.
- 1 Overview
- 2 Need for Cloud testing
- 3 Types of testing done in cloud
- 4 Steps
- 5 Keys to successful testing
- 6 Applications
- 7 Tools
- 8 Benefits
- 9 Issues
- 10 Current scenario
- 11 References
- 12 External links
Cloud Testing uses cloud infrastructure for software testing. Organizations pursuing testing in general and load, performance testing and production service monitoring in particular are challenged by several problems like limited test budget, meeting deadlines. High costs per test, large number of test cases, and little or no reuse of tests and geographical distribution of users add to the challenges. Moreover ensuring high quality service delivery and avoiding outages requires testing in one's datacenter, outside the data-center, or both. Cloud Testing is the solution to all these problems. Effective unlimited storage, quick availability of the infrastructure with scalability, flexibility and availability of distributed testing environment reduce the execution time of testing of large applications and lead to cost-effective solutions.
Need for Cloud testing
Today majority of Applications run on internet and depend on good performance of the network.
Causes of performance degradation
The following factors cause degradation in the performance.
- Unpredictable rate of increase in number of users
- Fast paced addition of new features to existing applications
- Changes in the third party allied software
- Variation in deployment environment depending on client requirements
Limitations of traditional testing techniques
Traditional approach to test these applications use internal testing techniques that have the following limitations.
- Testing at web scale
- Testing firewalls and load balancers
- Simulation of user activity from different geographic locations
- Testing external components
- High Cost of hardware, software and its maintenance
Cloud testing is a new approach which helps us to measure accurate performance by externally load testing these applications and overcome the limitations of traditional testing.
Types of testing done in cloud
Stress Test is used to determine ability of application to maintain a certain level of effectiveness beyond breaking point. It is essential for any application to work even under excessive stress and maintain stability. Stress testing assures this by creating peak loads using simulators.But the cost of creating such scenarios is enormous. Instead of investing capital in building on-premise testing environments, cloud testing offers affordable and scalable alternative.
Load testing of an application involves creation of heavy user traffic, and measuring its response. There is also a need to tune the performance of any application to meet certain standards.
Finding out thresholds, bottlenecks & limitations is a part of performance testing. For this, testing performance under a particular workload is necessary. By using cloud testing, it is easy to create such environment and vary the nature of traffic on-demand. This effectively reduces cost and time by simulating thousands of geographically targeted users.
Functional testing, latency testing, browser performance, compatibility testing are some other types of testing that can be performed in the cloud.
Companies simulate real world Web users by using cloud testing services that are provided by cloud service vendors such as SOASTA, HP, Load Impact, Compuware and Keynote systems. Once user scenarios are developed and the test is designed, these service providers leverage cloud servers (provided by cloud platform vendors such as Amazon.com, Google, Rackspace, etc.) to generate Web traffic that originates from around the world. Once the test is complete, the cloud service providers deliver results and analytics back to corporate IT professionals through real-time dashboards for a complete analysis of how their applications and the internet will perform during peak volumes.
Keys to successful testing
- Understanding a platform provider's elasticity model/dynamic configuration method
- Staying abreast of the provider's evolving monitoring services and Service Level Agreements (SLAs)
- Potentially engaging the service provider as an on-going operations partner if producing commercial off-the-shelf (COTS) software
- Being willing to be used as a case study by the cloud service provider. The latter may lead to cost reductions.
Cloud testing is often seen as only performance or load tests, however, as discussed ealier it covers many other types of testing. Cloud computing itself is often referred to as the marriage of Software as a Service (SaaS) and Utility Computing. In regard to test execution, the software offered as a service may be a transaction generator and the cloud provider's infrastructure software, or may just be the latter. Distributed Systems and Parallel Systems mainly use this approach for testing, because of their inherent complex nature. D-Cloud is a software testing environment which uses Cloud Testing for designing Fault-tolerant systems.
Leading cloud computing service providers include, among others, Amazon, 3-terra, Skytap, HP and SOASTA.
Some of the tools for cloud testing include :
- Cloud Assault
- Parasoft® SOAtest™
- HP LoadRunner
- Cloud Testing
The ability and cost to simulate web traffic for software testing purposes has been an inhibitor to overall web reliability. The low cost and accessibility of the cloud's extremely large computing resources provides the ability to replicate real world usage of these systems by geographically distributed users, executing wide varieties of user scenarios, at scales previously unattainable in traditional testing environments. Minimal start-up time along with quality assurance can be achieved by cloud testing.
Following are some of the key benefits:
- Reduction in capital expenditure
- Highly scalable
The initial setup cost for migrating testing to cloud is very high as it involves modifying some of the test cases to suit cloud environment. Thus, making the decision of migration crucial. Cloud testing is not necessarily the best solution to all testing problems.
Legacy systems & services need to be modified in order to be tested on cloud.Usage of robust interfaces with these legacy systems may solve this problem. Also like any other cloud services, cloud testing is vulnerable to security issues.
The test results may not be accurate due to varying performance of service providers’ network and internet.
An evolving cloud testing community is forming under the auspices of the Software Testing & Quality Assurance group hosted by LinkedIn. Testing professionals openly share their experiences and exchange ideas related to cloud testing in order to enhance each-others proficiencies.
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