Awesome

Cake.Coverlet

Usage

In order to use the addin please make sure you've included Coverlet in the project you wish to cover and add the following to your cake build file

#addin nuget:?package=Cake.Coverlet

You can also install coverlet as a global tool on your machine or with the Cake.DotNetTool.Module and run the command separately from MSBuild.

Note: Works with Coverlet 2.1.1 and up

Then use one of the following snippets

Task("Test")
    .IsDependentOn("Build")
    .Does<MyBuildData>((data) =>
{
    var testSettings = new DotNetTestSettings {
    };

    var coverletSettings = new CoverletSettings {
        CollectCoverage = true,
        CoverletOutputFormat = CoverletOutputFormat.opencover,
        CoverletOutputDirectory = Directory(@".\coverage-results\"),
        CoverletOutputName = $"results-{DateTime.UtcNow:dd-MM-yyyy-HH-mm-ss-FFF}"
    };

    DotNetTest("./test/My.Project.Tests/My.Project.Tests.csproj", testSetting, coverletSettings);
}

Or for when installed as a tool:

Task("Test")
    .IsDependentOn("Build")
    .Does<MyBuildData>((data) =>
{
    var coverletSettings = new CoverletSettings {
        CollectCoverage = true,
        CoverletOutputFormat = CoverletOutputFormat.opencover,
        CoverletOutputDirectory = Directory(@".\coverage-results\"),
        CoverletOutputName = $"results-{DateTime.UtcNow:dd-MM-yyyy-HH-mm-ss-FFF}"
    };

    // I want to specify the specific dll file and the project exactly.
    Coverlet(
        "./test/My.Project.Tests/bin/Debug/net46/My.Project.Tests.dll", 
        "./test/My.Project.Tests/My.Project.Tests.csproj", 
        coverletSettings);

    // I want to specify just the project file and the dll can be
    // inferred from the name of the project file.
    Coverlet(
        "./test/My.Project.Tests/My.Project.Tests.csproj", 
        coverletSettings);

    // I want to specify just the project directory, we will discover
    // any proj file in the directory (take the first) and infer the 
    // name from the found project.
    Coverlet(
        "./test/My.Project.Tests",
        coverletSettings);
}

There is an additional api exposed for transforming the output name of the coverage file at the time of calling dotnet test. This transform function follows the form Func<string, string> being passed the CoverletOutputName and the return is used for the filename.

Task("Test")
    .IsDependentOn("Build")
    .Does<MyBuildData>((data) =>
{
    var testSettings = new DotNetTestSettings {
    };

    var coverletSettings = new CoverletSettings {
        CollectCoverage = true,
        CoverletOutputFormat = CoverletOutputFormat.opencover,
        CoverletOutputDirectory = Directory(@".\coverage-results\"),
        CoverletOutputName = $"results"
        OutputNameTransformer = (fileName, directory) => $@"{directory}\{fileName}-HelloWorld"
    };

    DotNetTest("./test/Stubble.Core.Tests/Stubble.Core.Tests.csproj", testSetting, coverletSettings);
}

We expose a default transformer for the standard practice of appending the current datetime to the file as WithDateTimeTransformer()

If you wish to only change the directory that the output is written to then set the CoverletOutputDirectory and the filename handling will be done by coverlet as usual.

Setting more than one output format

You can support multiple coverlet formats by providing them like this:

var coverletSettings = new CoverletSettings {
        CollectCoverage = true,
        CoverletOutputFormat = CoverletOutputFormat.opencover | CoverletOutputFormat.cobertura,
        CoverletOutputDirectory = Directory(@".\coverage-results\"),
        CoverletOutputName = $"results-{DateTime.UtcNow:dd-MM-yyyy-HH-mm-ss-FFF}"
    };

Or by using the method on the settings class like this:

var coverletSettings = new CoverletSettings {
        CollectCoverage = true,
        CoverletOutputFormat = CoverletOutputFormat.opencover,
        CoverletOutputDirectory = Directory(@".\coverage-results\"),
        CoverletOutputName = $"results-{DateTime.UtcNow:dd-MM-yyyy-HH-mm-ss-FFF}"
    }.WithFormat(CoverletOutputFormat.cobertura);