The easiest way to build the Test Adapter for Catch2 yourself is to open the Visual Studio solution file (VSTestAdapterCatch2.sln) and build the 'VSTestAdapterCatch2'-project. By default, this builds unsigned assemblies that can be used to install the test adapter in Visual Studio. Be sure to set the Solution Configuration to Release
if you intend to use the generated vsix-file to install the test adapter.
If you need the generated assemblies to be signed you need to add a key-file, named "key.snk" in the root of the 'VSTestAdapterCatch2'-project folder. When you then reload the project this key-file will be used to sign the assembly. The same is set up for the 'Catch2Interface' and 'Catch2Adapter' class-library projects, i.e., if a "key.snk"-file is copied to their respective project folders, the generated assemblies will be signed using the copied key-file.
For those that want to add the test adapter to their own extension repository, below is an excerpt of the entry that can be placed in your "atom.xml"-file.
<entry>
<id>VSTestAdapterCatch2.73ba8471-3771-47bf-bd23-49a1ba09af89</id>
<title type="text">Test Adapter for Catch2.</title>
<summary type="text">Visual Studio Test Adaptor for use with Catch2 test framework.</summary>
<published>2018-06-24T12:17:00Z</published>
<updated>2018-08-18T08:17:00Z</updated>
<author>
<name>Johnny Hendriks</name>
</author>
<content type="application/octet-stream" src="VSTestAdapterCatch2.vsix" />
<Vsix xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://schemas.microsoft.com/developer/vsx-syndication-schema/2010">
<Id>VSTestAdapterCatch2.73ba8471-3771-47bf-bd23-49a1ba09af89</Id>
<Version>1.3.0</Version>
<References />
<Rating xsi:nil="true" />
<RatingCount xsi:nil="true" />
<DownloadCount xsi:nil="true" />
</Vsix>
</entry>