Service Virtualization On The Cheap (Agile Testing Days 2016)

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Service Virtualization on the Cheap [email protected] @EmanuilSlavov

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3 hours 3 minutes

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Problems with 3rd party services Unreliable Network Throttling Costly Can’t Control Output

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Service Virtualization to the Rescue

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Your Options

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Record and Replay Application External Service Storage First Request Next Request

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Pros Cons Uses real recorded data Refreshes automatically Returns only recorded data Framework specific Easy to setup for simple APIs Requires network

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Stubs In The Code Application External Service Internal Logic Should call the real API Should fake the request

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Pros Cons No need for network Access to internal app state Monolithic applications only Cheap to setup Do not cover low level code May cause havoc in production

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Simulation Application Facebook Paypal Amazon S3

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Facebook Application Paypal Amazon S3 Proxy Simulation

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Basic Functionality

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Existing Tools (March 2016) Transparent Fake SSL certs Dynamic Responses Local Storage Return Binary Data Regex URL match Stubby4J WireMock Wilma soapUI MockServer mounteback Hoverfly Mirage

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So we decided to create our own.

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Written in Node.JS Pluggable architecture Optimized for speed Battle tested: Facebook, Twitter, Instagram It’s free, examples included

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github.com/emanuil/nagual Project Nagual

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Enough talk, let’s DEMO!

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Basic Scenario

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Advanced Scenario

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POST /v2.2/12345678/comments { id: 99997777 } GET /v2.2/99997777 { id: 99997777  message: “my new comment” timestamp: 1481923013 more_fields: “yes” } {message: “my new comment”} Application (request) Facebook (response)

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The POST Stub

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The GET Stub

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Monitoring

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Since Nagual acts as a MiTM proxy, all passing trafﬁc can be inspected.

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Future Work

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Simulate other protocols - e.g. SMTP Random generation of non-latin text encodings API access to the logs

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Roll Your Own

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Nagual core is only 700 lines of code Modifying HTTP is easy in Node.JS Future out what features you need

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