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Wiremock response templating example

Wiremock by itself doesn't provide a direct way to to stub different responses akin to Mockito's thenReturn or Spock's multiple stubs. Wiremock however provides a ResponseTransformer. Line 1: extend import com.

Line Check if the count has reached a certain threshold and if so, then add customerCar property to response JSON. Line Add count to the response header. That acts as our state storage. Once the count will reach x in this case 3, then change the response line Line Set apply globally false i. Once you have defined a ResponseTransformer like above, you can then attach it to wiremock instance like so:. Please let me know if you have any questions or if there's a better way to do the same thing in wiremock via comments on this post.

ResponseTransformer Line 8: override the transform function. Line Check if this is the api you are interested in. Line Check if the count has reached a certain threshold and if so, then add customerCar property to response JSON Line Add count to the response header.

Line Give your transformer a name. My experience with Java, Groovy, Grails, Python and more. Share this.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Response headers and bodies, as well as proxy URLs, can optionally be rendered using Handlebars templates. This enables attributes of the request to be used in generating the response e. When starting WireMock programmatically, response templating can be enabled by adding ResponseTemplateTransformer as an extension e.

The boolean constructor parameter indicates whether the extension should be applied globally. If true, all stub mapping responses will be rendered as templates prior to being served.

WireMock - Testing a service

Otherwise the transformer will need to be specified on each stub mapping by its name response-template :. Command line parameters can be used to enable templating when running WireMock standalone. By default, all templated fragments headers, bodies and proxy URLs are cached in their compiled form for performance, since compilation can be expensive for larger templates. The model of the request is supplied to the header and body templates. The following request attributes are available:.

A number of HTTP elements query parameters, form fields, headers can be single or multiple valued. The template request model and built-in helpers attempt to make this easy to work with by wrapping these in a "list or single" type that returns the first and often only value when no index is specified, but also support index access. When using the eq helper with one-or-many values, it is necessary to use the indexed form, even if only one value is present.

The reason for this is that the non-indexed form returns the wrapper type and not a String, and will therefore fail any comparison with another String value. All of the standard helpers template functions provided by the Java Handlebars implementation by jknack plus all of the string helpers and the conditional helpers are available e.

When the incoming request contains XML, the xPath helper can be used to extract values or sub documents via an XPath 1. For instance, given the XML. Given the JSON. The formData helper parses its input as an HTTP form, returning an object containing the individual fields as attributes.

The helper takes the input string and variable name as its required parameters, with an optional urlDecode parameter indicating that values should be URL decoded. The folowing example will parse the request body as a form, then output a single field formField3 :.

The regexExtract helper supports extraction of values matching a regular expresson from a string. Regex groups can be used to extract multiple parts into an object for later use the last parameter is a variable name to which the object will be assigned :. To avoid disclosure of sensitive variables, only permitted variables can be read. Permitted variable names are defined via a set of regular expressions. These can be configured when constructing the response template extension:.

If no permitted system key patterns are set, a single default of wiremock.

Extending WireMock

Skip to content. Permalink Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Branch: master. Find file Copy path. Cannot retrieve contributors at this time. Raw Blame History.

You signed in with another tab or window.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I am encountering a problem of performance when I active the reponse templating on wiremock, especially when the response content is important.

I've ask help on the github of this lib, the answer is to activate a cache. I've check on the code of Wiremock, no cache is implemented. But I can't figure out how the process can take so much time to just parse a string of Kb.

The example is really basic, one mapping file which answer a file of Kb, templating active no function in the content. I suspect caching compiled templates might be a good idea, but I need to think a bit about memory usage and ensuring invalidation at the right moments.

I implemented the cache in Handlerbars. Result are totaly predicatble and better on second call about 60ms. This solution is not entirely satisfactory because lost 15 sec on the first call in a benchmark test is still not acceptable.

I've implement in wiremock an other lib of templating called pebble which is close to the handlebars one, results are really great! See PR to implement cache.

Response Templating

Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Copy link Quote reply. Performance issue with templating I am encountering a problem of performance when I active the reponse templating on wiremock, especially when the response content is important. WireMock V2. This comment has been minimized. Sign in to view.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am trying to provide a MOCK service that takes a headerName and value from the query and returns it as a dynamic header with the response.

I am using the following response definition:. The header value is correctly evaluated and put into the response template, however I can't get the header name to be taken from the request.

This is supported in WireMock. Presently this type of variability is not part of the out-of-the-box WireMock application and would have to be custom added. Learn more. Wiremock - How can I apply response templating to the header name? Ask Question. Asked 1 year, 10 months ago. Active 1 year, 9 months ago. Viewed 1k times. Any ideas? Thanks in advance Alex. Fuss A. Fuss 21 3 3 bronze badges. Active Oldest Votes.

Stef Heyenrath Stef Heyenrath 6, 9 9 gold badges 49 49 silver badges 90 90 bronze badges. I did update the example for WireMock. Net, you can define this. Kootstra A. Kootstra 5, 3 3 gold badges 15 15 silver badges 36 36 bronze badges.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.Explaining and demonstrating the use of template parameters in wiremocked responses within a Spring Boot based integration test. This article is available on both my blog Paperstack and on my GitHub account which also contains all of the source code. For the purposes of this article, Wiremock is a set of libraries to allow you to mock up web APIs for testing. A good integration test needs those services to be completely under the control of your tests so that you can simulate responses, verify the expected requests are made, and simulate error situations.

Details follow a little further on. For the other side of the coin you want to be able to make requests to your own services and verify that they return the expected responses. This sends a GET request to an endpoint defined by the uri string supplied and expects a response with status code success with content and the body contains just the string Pingy! If any of these conditions fail to hold then an AssertionError will be thrown describing the discrepancy and the test will fail.

The relationship will be: rolls up sleeves and creates ascii art…. As you an see, if this gets the expected payload it returns the text Pingy! Other than a minor effort to deal with null values there is no real error checking here. For example, if the API dependency is not running whether real or mocked then the controller will fail, an exception will be thrown, and my service will return a status response.

One way to configure this test would be to hard code a port for my application - say the default Spring Boot port of - and hardcode another port for the Wiremocked API - say port This would work fine, but would make it impossible to run the test if some other application had already reserved those ports. A better strategy is to instruct both the application and the wiremocked API to choose unused ephemeral ports. Spring Boot supports this approach nicely.

I can also tell the SpringBoot test that I intend to use Wiremock saving some of the configuration work and that I want it to choose a suitable port as well by specifying the port as zero zero is not a real port so this is unambiguous :.

Spring Boot Test makes the special property wiremock. I can therefore specify my test uri property like this:. Finally I need to know what port the application under test will be listening on - and Spring Boot Test provides the LocalServerPort annotation to autowire this into the test:.

Templates are not enabled by default in Wiremock so you need to turn them on globally for all wiremock stubs you create or for an individual case. To turn them on globally you would have to override the default Spring Boot Test configuration of Wiremock by supplying a configuration bean as part of the test suite:.

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In my example I turn the transformer on explicitly for the test case with the Wiremock DSL invocation of. I specify the template file to use by invoking. The Wiremock response template transformer uses the Mustache templating format and so I need to supply a model with parameters.

Note that in my call to populate this I omit the parameters prefix I omit the parameters prefix but this must be present in the template file itself. Another set of model keys is available and automatically created from the request under the request prefix, which is why a prefix is needed to differentiate the two sets. In the light of this, the invocation of. This is of course a super simple demonstration of just one part of the capabilities of Wiremock in a particular context, but it has a lot of features that I like a lot.

Amongst other things you can run it stand-alone as its own process and controll it remotely via an admin API. At test start-up I see the following warnings:. This is coming from a dependency of the RestAssured library. At the time of writing the latest version of RestAssured is 4. You may need to use the rest-assured-all artifact rather than rest-assured in that case.You can define your own matchers using the Match trait, as well as using Fn closures.

Check Match 's documentation for more details and examples. Each instance of MockServer is fully isolated: start takes care of finding a random port available on your local machine which is assigned to the new MockServer. You should use one instance of MockServer for each test, to ensure full isolation and no cross-test interference. When a MockServer instance goes out of scope e. If you encounter any compatibility bug, please open an issue on our GitHub repository.

Check the table below to see how wiremock compares to them across the following dimensions:. Spying is in scope for future releases of wiremock. More request matchers can be added to those provided out-of-the-box to handle common usecases.

Given a set of matchers, a Mock instructs an instance of MockServer to return a pre-determined response if the matching conditions are satisfied. A fluent builder to construct a Mock instance given matchers and a ResponseTemplate. An HTTP web-server running in the background to behave as one of your dependencies using Mock s for testing purposes. An incoming request to an instance of MockServer. The blueprint for the response returned by a MockServer when a Mock matches on an incoming request.

Anything that implements Match can be used to constrain when a Mock is activated. Authors Luca Palmieri. Versions 0. See all wiremock's items Modules Structs Traits. All crates. It provides mocking of HTTP responses using request matching and response templating.

Mock :: given method "GET". A collection of different matching strategies provided out-of-the-box by wiremock.Are you tired of writing tests which have a lot of boilerplate code? After we have finished this blog post, we:.

When we invoke this method, we have to create a new MappingBuilder object and pass this object to the invoked method as a method parameter. The MappingBuilder object has two responsibilities:. Next, we will take a look at some examples that demonstrate how we can configure the returned HTTP response. For example, if we want to ensure that our WireMock server returns the HTTP status codewe have to write a test method that looks as follows:.

Secondwe can create the required ResponseDefinitionBuilder object by using the static factory methods of the WireMock class. If we want to use this approach, we can use these factory methods: badRequestbadRequestEntitycreatedforbiddennoContentnotFoundokserverErrorserviceUnavailableand unauthorized. This method takes two method parameters:. For example, if we want to ensure that our WireMock server returns an HTTP header called: Namewe have to write a test method that looks as follows:.

If we want to return multiple HTTP headers, we can either invoke the withHeader method multiple times or we can configure all returned headers at the same time. We can use this method by following these steps:. For example, if we want to ensure that our WireMock server returns the HTTP headers called: Name and Occupationwe have to write a test method that looks as follows:.

If we want to configure the body of the returned HTTP response, we have to also set its content type. We can configure the body of the returned HTTP response by using one of these three options:. Firstwe can configure the body of the returned HTTP response by following these steps:. Secondwe can read the body of the returned HTTP response from a file. If we want to use this approach, we have to follow these steps:. We can use one of these three methods:.

Firstall strings given to WireMock including the content of the body files must use the UTF-8 character encoding. Secondwhen we configure the body the returned HTTP response, we should select the used approach by following these rules:. If we want to redirect an HTTP request to another location, we can create the required ResponseDefinitionBuilder object by using one of these three methods:. You can get the example application of blog post from Github.

Also, keep in mind that I removed the setup and teardown methods from the code examples of this blog post because they add no value to this blog post.


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Jull Posted on 10:12 pm - Oct 2, 2012

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