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Load Test - Binding Context Parameters

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The new Load Tests features that are coming with Visual Studio 2013 are great. In combination with Windows Azure and TFS Controllers, you can run load test using cloud infrastructure without having to deploy or configure something things on the cloud.
When developers start to create different web test that will be used for load tests they usually them in sub-tests and reuse them when is possible. For example very easily you can end up with something like this:

  • Foo1WebTest
  • Foo2WebTest
  • Foo3WebTest
  • BigFooWebTest

Where BigFooWebTest make calls to Foo1WebTest and Foo2WebTest.
If you started to extract context parameters from each web test you will observer a pretty odd behavior. By default it is not possible to bind a context parameter. This means that you will not be able to fetch data for a context parameter from a data source like a csv file or data base.
Even if you will write to the value of the parameter context the binding command (“{{..#TableName.CollumnName}}”) you will observe that this will not work. When you will run the test, the value of the context parameter will be the string value itself “{{..#TableName.CollumnName}}”.
In this moment it is not possible to bind a context parameter. The only available solution in this moment is to write a plugin for the test that will load the values from data source in memory. This plugin will be able to set the value of context parameter with the memory values.
For more information about load test plugin: http://msdn.microsoft.com/en-us/library/ms243153.aspx
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