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Support for deterministic builds is available **only**in the `msbuild`(`/p:CollectCoverage=true`) and `collectors`(`--collect:"XPlat Code Coverage"`) drivers. Deterministic builds are important because they enable verification that the resulting binary was built from the specified sources. For more information on how to enable deterministic builds, I recommend you to take a look at [Claire Novotny](https://github.com/clairernovotny)'s [guide](https://github.com/clairernovotny/DeterministicBuilds).
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Deterministic builds are important as they enable verification that the resulting binary was built from the specified source and provides traceability.
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For more information on how to enable deterministic build I recommend you to take a look at [@clairernovotny](https://github.com/clairernovotny)'s guide https://github.com/clairernovotny/DeterministicBuilds
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From a coverage perspective, deterministic builds create some challenges because coverage tools usually need access to complete source file metadata (ie. local path) during instrumentation and report generation. These files are reported inside the `.pdb` files, where debugging information is stored.
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From coverage perspective deterministic build put some challenge because usually coverage tools need access to source file metadata (ie. local path) during instrumentation and report generation.
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These files are reported inside `pdb` files, where are stored debugging information needed by debuggers and also by tools that needs to work with "build" metadata information, for example generated `dll` modules and `source files` used.
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In local (non-CI) builds metadata emitted to pdbs are not "deterministic", that means that for instance source files path are reported with full path.
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If for instance we build same project on different machine we'll have different paths emitted inside pdbs, so builds are "non deterministic" because same project build won't generates same artifacts.
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In local (non-CI) builds, metadata emitted to pdbs are not "deterministic", which means that source files are reported with their full paths. For example, when we build the same project on different machines we'll have different paths emitted inside pdbs, hence, builds are "non deterministic".
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As explained above, to improve the level of security of generated artifacts (suppose for instance DLLs inside the nuget package), we need to apply some signature (signing with certificate) and validate before usage to avoid possible security issues like tampering.
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Finally thanks to deterministic CI builds (with the `ContinuousIntegrationBuild` property set to `true`) plus signature we can validate artifacts and be sure that binary was build from a specific sources (because there is no hard-coded variables metadata like paths from different build machines).
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As explained above, to improve the level of security of generated artifacts (for instance, DLLs inside the NuGet package), we need to apply some signature (signing with certificate) and validate before usage to avoid possible security issues like tampering.
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Finally, thanks to deterministic CI builds (with the `ContinuousIntegrationBuild` property set to `true`) plus signature we can validate artifacts and be sure that the binary was built from specific sources (because there is no hard-coded variable metadata, like paths from different build machines).
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**Deterministic build is supported without any workaround since version 3.1.100 of .NET Core SDK**
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## Workaround only for .NET Core SDK < 3.1.100
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At the moment deterministic build works thanks to Roslyn compiler that emits deterministic metadata if `DeterministicSourcePaths` is enabled. Take a look here for more information https://github.com/dotnet/sourcelink/tree/master/docs#deterministicsourcepaths.
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To allow coverlet to correctly do his work we need to provide information to translate deterministic path to real local path for every project referenced by tests project.
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The current workaround is to add on top of your repo a `Directory.Build.targets` with inside a simple snippet with custom `target` that supports coverlet resolution algorithm.
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At the moment, deterministic build works thanks to the Roslyn compiler emitting deterministic metadata if `DeterministicSourcePaths` is enabled. Take a look [here](https://github.com/dotnet/sourcelink/tree/master/docs#deterministicsourcepaths) for more information.
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To allow Coverlet to correctly do its work, we need to provide information to translate deterministic paths to real local paths for every project referenced by the test project. The current workaround is to add at the root of your repo a `Directory.Build.targets` with a custom `target` that supports Coverlet resolution algorithm.
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```xml
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<!-- This target must be imported into Directory.Build.targets -->
If you already have a `Directory.Build.targets` file on your repo root you can simply copy `DeterministicBuild.targets` you can find on coverlet repo root next to yours and import it in your targets file.
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This target will be used by coverlet to generate on build phase a file on output folder with mapping translation informations, the file is named `CoverletSourceRootsMapping`.
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If you already have a `Directory.Build.targets` file on your repo root you can simply copy `DeterministicBuild.targets` (which can be found at the root of this repo) next to yours and import it in your targets file. This target will be used by Coverlet to generate, at build time, a file that contains mapping translation information, the file is named `CoverletSourceRootsMapping` and will be in the output folder of your project.
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You can follow our [step-by-step sample](Examples.md)
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Feel free to file an issue in case of troubles!
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Feel free to file an issue in case you run into any trouble!
Since the beginning all coverlet drivers shared the same coverage engine.
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Since version 3.0.0 we decided to consolidate versioning across drivers so for every new release all drivers will have the same version number.
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We think that keeping the versions in sync express better the set of features every release will have.
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This does not mean that all drivers will support every functionality/feature or have the same behaviours, since they are limited by the context they're running in.
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In the table below we keep track of main differences:
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All Coverlet drivers share the same coverage engine. Since version 3.0.0, we've consolidated versioning across drivers, so for every new release, all drivers will have the same version number.
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We think that keeping the versions in sync better expresses the set of features every release will have. This does not mean that all drivers will support every functionality/feature or have the same behaviours, since they are limited by the context they're running in.
If possible we advice you to use the collectors integration (vstest engine integration), since it is fully integrated inside the test pipeline and does not suffer of the [known issues](KnownIssues.md) of the other drivers.
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When possible, we advice you to use the collectors integration (VSTest engine integration), since it is fully integrated inside the test pipeline and does not suffer from the [known issues](KnownIssues.md) of the other drivers.
The currently supported [TeamCity statistics](https://confluence.jetbrains.com/display/TCD18/Build+Script+Interaction+with+TeamCity#BuildScriptInteractionwithTeamCity-ServiceMessages) are:
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You can also include coverage of the test assembly itself by specifying the `--include-test-assembly` flag.
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## SourceLink
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Coverlet supports [SourceLink](https://github.com/dotnet/sourcelink) custom debug information contained in PDBs. When you specify the `--use-source-link` flag, Coverlet will generate results that contain the URL to the source files in your source control instead of local file paths.
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## Exit Codes
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Coverlet outputs specific exit codes to better support build automation systems for determining failures and take action on it.
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Coverlet outputs specific exit codes to better support build automation systems for determining the kind of failure so the appropriate action can be taken.
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