Changelog

June 1, 2026 · View on GitHub

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

Improvements

Implement dynamic exclusion filters for Coverlet.MTP assemblies #1946

Fixed

Fix Regression in branch coverage for lambda expressions #1937
Fix coverlet.MTP crashes during instrumentation #1934

Release date 2026-05-18

Improvements

Coverlet with MTP 2 doesn't show test coverage statistic in console #1907
Avoid unnecessary testhost restarts #1912 by https://github.com/mawosoft

Fixed

Fix inconsistent paths in cobertura reports #1723
Fix when using "is" with "and" in pattern matching, branch coverage is lower than normal #1313
Fix Coverlet flagging a branch for an async functions finally block where none exists #1337
Fix Coverlet Tracker Missing CompilerGeneratedAttribute #1828

Maintenance

Add architecture docs and diagrams for all integrations #1927
Update NuGet packages and .NET SDK versions #1933

Release date 2026-04-17

Packages

coverlet.msbuild 10.0.0 coverlet.console 10.0.0 coverlet.collector 10.0.0 coverlet.MTP 10.0.0

Improvements

Unique Report Filenames (coverlet.MTP and AzDO) #1866
Add --coverlet-file-prefix option for unique report files #1869
Introduce .NET 10 support #1823

Fixed

Fix [BUG] Wrong branch rate on IAsyncEnumerable for generic type #1836
Fix [BUG] Missing Coverage after moving to MTP #1843
Fix [BUG] No coverage reported when targeting .NET Framework with 8.0.1 #1842
Fix [BUG] Behavior changes between MTP and Legacy (msbuild) #1878
Fix [BUG] Coverlet.MTP - Unable to load coverlet.mtp.appsettings.json #1880
Fix [BUG] Coverlet.Collector produces empty report when Mediator.SourceGenerator is referenced #1718 by https://github.com/yusyd
Fix [BUG] Crash during instrumentation (Methods using LibraryImport/DllImport have no body) #1762

Maintenance

Add comprehensive async method tests and documentation for issue #1864
Replace Tmds.ExecFunction Package in coverlet.core.coverage.tests #1833
Add net9.0 and net10.0 targets #1822

Release date 2026-03-17

Packages

coverlet.msbuild 8.0.1 coverlet.console 8.0.1 coverlet.collector 8.0.1 coverlet.MTP 8.0.1

Fixed

Fix [BUG] TypeInitializationException when targeting .NET Framework #1818
Fix [BUG] coverlet.MTP build fails with CS0400 due to developmentDependency=true #1827

Improvements

Additional improvements needed for .NET Framework instrumentation type import #1825

Release date 2026-02-15

Packages

coverlet.msbuild 8.0.0 coverlet.console 8.0.0 coverlet.collector 8.0.0 coverlet.MTP 8.0.0

Special Thanks: A huge thank you to @Bertk for driving the majority of the work in this release! 🎉

Fixed

Fix System.CommandLine 2.0 release is available #1776
Fix Excluding From Coverage bad defaults from given example #1764
Fix branchpoint exclusion for sdk 8.0.407 #1741
Fix missing copyright information in NuGet #1794
Fix bad default values in documentation #1764 by https://github.com/cboudereau

Improvements

Coverlet MTP extension feature #1788
Generate SBOM for nuget packages #1752
Use multi targets projects for coverlet.collector, coverlet.msbuild.tasks packages #1742
Use .NET 8.0 target framework for coverlet.core and remove Newtonsoft.Json #1733
Use latest System.CommandLine version #1660
Upgraded minimum required .NET SDK and runtime to .NET 8.0 LTS (Long Term Support) (Breaking Change)
Use xunit.v3 for tests and example code

Release date 2025-01-20

Packages

coverlet.msbuild 6.0.4 coverlet.console 6.0.4 coverlet.collector 6.0.4

Fixed

Fix empty coverage report when using include and exclude filters #1726

Release date 2024-12-31

Packages

coverlet.msbuild 6.0.3 coverlet.console 6.0.3 coverlet.collector 6.0.3

Fixed

Fix RuntimeConfigurationReader to support self-contained builds #1705 by https://github.com/pfeigl
Fix inconsistent filenames with UseSourceLink after .NET 8 #1679
Fix hanging tests #989
Fix coverlet instrumentation becomes slow after installing dotnet sdk 8.0.200 #1620
Fix upgrading v6.0.1 to v6.0.2 increases instrumentation time #1649
Fix Unable to instrument module - NET 8 #1631
Fix slow modules filtering process #1646 by https://github.com/BlackGad
Fix incorrect coverage await using in generic method #1490

Improvements

Cache the regex used in InstrumentationHelper #1693
Enable dotnetTool integration tests for linux #660

Release date 2024-03-13

Packages

coverlet.msbuild 6.0.2 coverlet.console 6.0.2 coverlet.collector 6.0.2

Fixed

Threshold-stat triggers error #1634
Fixed coverlet collector 6.0.1 requires dotnet sdk 8 #1625
Type initializer errors after updating from 6.0.0 to 6.0.1 #1629
Exception when multiple exclude-by-attribute filters specified #1624

Improvements

More concise options to specify multiple parameters in coverlet.console #1624

Release date 2024-02-19

Packages

coverlet.msbuild 6.0.1 coverlet.console 6.0.1 coverlet.collector 6.0.1

Fixed

Uncovered lines in .NET 8 for inheriting records #1555
Fix record constructors not covered when SkipAutoProps is true #1561
Fix .NET 7 Method Group branch coverage issue #1447
Fix ExcludeFromCodeCoverage does not exclude method in a partial class #1548
Fix ExcludeFromCodeCoverage does not exclude F# task #1547
Fix issues where ExcludeFromCodeCoverage ignored #1431
Fix issues with ExcludeFromCodeCoverage attribute #1484
Fix broken links in documentation #1514
Fix problem with coverage for .net5 WPF application #1221 by https://github.com/lg2de
Fix unable to instrument module for Microsoft.AspNetCore.Mvc.Razor #1459 by https://github.com/lg2de

Improvements

Extended exclude by attribute feature to work with fully qualified name #1589
Use System.CommandLine instead of McMaster.Extensions.CommandLineUtils #1474 by https://github.com/Bertk
Fix deadlock in Coverlet.Integration.Tests.BaseTest #1541 by https://github.com/Bertk
Add coverlet.msbuild.tasks unit tests #1534 by https://github.com/Bertk

Release date 2023-05-21

Packages

coverlet.msbuild 6.0.0 coverlet.console 6.0.0 coverlet.collector 6.0.0

Fixed

Could not write lines to file CoverletSourceRootsMapping - in use by another process #1155
Incorrect coverage for methods returning IAsyncEnumerable in generic classes #1383
Wrong branch coverage for async methods .NET Standard 1.x #1376
Empty path exception in visual basic projects #775
Align published nuget package version to github release version #1413
Sync nuget and github release versions #1122

Improvements

Migration of the project to .NET 6.0 #1473

Breaking changes

New parameter ExcludeAssembliesWithoutSources to control automatic assembly exclusion 1164. The parameter InstrumentModulesWithoutLocalSources has been removed. since it can be handled by setting ExcludeAssembliesWithoutSources to None.
The default heuristics for determining whether to instrument an assembly has been changed. In previous versions any missing source file was taken as a signal that it was a third-party project that shouldn't be instrumented, with exceptions for some common file name patterns for source generators. Now only assemblies where no source files at all can be found are excluded from instrumentation, and the code for detecting source generator files have been removed. To get back to the behavior that at least one missing file is sufficient to exclude an assembly, set ExcludeAssembliesWithoutSources to MissingAny, or use assembly exclusion filters for more fine-grained control.

Release date 2022-10-29

Packages

coverlet.msbuild 3.2.0 coverlet.console 3.2.0 coverlet.collector 3.2.0

Fixed

Fix TypeLoadException when referencing Microsoft.Extensions.DependencyInjection v6.0.1 #1390
Source Link for code generators fails #1322
Await foreach has wrong branch coverage when method is generic #1210
ExcludeFromCodeCoverage attribute on local functions ignores lambda expression #1302

Added

Added InstrumentModulesWithoutLocalSources setting #1360 by @TFTomSun

Release date 2022-02-06

Packages

coverlet.msbuild 3.1.2 coverlet.console 3.1.2 coverlet.collector 3.1.2

Fixed

Fix CoreLib's coverage measurement is broken #1286
Fix UnloadModule injection 1291

Release date 2022-01-30

Packages

coverlet.msbuild 3.1.1 coverlet.console 3.1.1 coverlet.collector 3.1.1

Fixed

Fix wrong branch coverage with EnumeratorCancellation attribute #1275
Fix negative coverage exceeding int.MaxValue #1266
Fix summary output format for culture de-DE #1263
Fix branch coverage issue for finally block with await #1233
Fix threshold doesn't work when coverage empty #1205
Fix branch coverage issue for il switch #1177
Fix branch coverage with using statement and several awaits#1176
Fix CopyCoverletDataCollectorFiles to avoid to override user dlls for dotnet publish scenario #1243

Improvements

Improve logging in case of exception inside static ctor of NetstandardAwareAssemblyResolver #1230
When collecting open the hitfile with read access #1214 by https://github.com/JamesWTruher
Add CompilerGenerated attribute to the tracker #1229

Release date 2021-07-19

Packages

coverlet.msbuild 3.1.0 coverlet.console 3.1.0 coverlet.collector 3.1.0

Fixed

Fix branch coverage for targetframework net472 #1167
Fix F# projects with unknown source #1145
Fix SkipAutoProps for inline assigned properties #1139
Fix partially covered throw statement #1144
Fix coverage threshold not failing when no coverage #1115
Fix partially covered await foreach statement #1107 by https://github.com/alexthornton1
Fix System.MissingMethodException(TryGetIntArgFromDict) #1101
Fix ExcludeFromCodeCoverage on props #1114
Fix incorrect branch coverage with await using #1111 by https://github.com/alexthornton1

Added

Support deterministic reports #1113
Specifying threshold level for each threshold type #1123 by https://github.com/pbmiguel

Improvements

Implementation of Npath complexity for the OpenCover reports #1058 by https://github.com/benjaminZale

Release date 2021-02-21

Packages

coverlet.msbuild 3.0.3 coverlet.console 3.0.3 coverlet.collector 3.0.3

Fixed

Fix code coverage stops working if assembly contains source generators generated file #1091

Release date 2021-01-24

Packages

coverlet.msbuild 3.0.2 coverlet.console 3.0.2 coverlet.collector 3.0.2

Fixed

Fix multi-line lambda coverage regression #1060
Opt-in reachability helper to mitigate resolution issue #1061

Release date 2021-01-16

Packages

coverlet.msbuild 3.0.1 coverlet.console 3.0.1 coverlet.collector 3.0.1

Fixed

Fix severe loss in coverage #1043 by https://github.com/daveMueller

Release date 2021-01-09

Packages

coverlet.msbuild 3.0.0 coverlet.console 3.0.0 coverlet.collector 3.0.0

Fixed

Attribute exclusion does not work if attribute name does not end with "Attribute" #884 by https://github.com/bddckr
Fix deterministic build+source link bug #895
Fix anonymous delegate compiler generate bug #896
Fix incorrect branch coverage with await ValueTask #949 by https://github.com/alexthornton1
Fix switch pattern coverage #1006

Added

Skip autoprops feature #912
Exclude code that follows [DoesNotReturn] from code coverage #904 by https://github.com/kevin-montrose
CoverletReport MSBuild variable containing coverage filenames #932 by https://github.com/0xced
Add Visual Studio Add-In #954 by https://github.com/FortuneN
Remove workaround for deterministic build for sdk >= 3.1.100 #965
Allow standalone coverlet usage for integration/end-to-end tests using .NET tool driver #991
Support .NET Framework(>= net461) for in-process data collectors #970

Release date 2020-05-30

Packages

coverlet.msbuild 2.9.0 coverlet.console 1.7.2 coverlet.collector 1.3.0

Fixed

Fix for code complexity not being generated for methods for cobertura reporter #738 by https://github.com/dannyBies
Fix coverage, skip branches in generated MoveNext() for singleton iterators #813 by https://github.com/bert2
Fix 'The process cannot access the file...because it is being used by another process' due to double flush for collectors driver #https://github.com/coverlet-coverage/coverlet/pull/835
Fix skip [ExcludefromCoverage] for generated async state machine #849

Added

Added support for deterministic build for msbuild/collectors driver #802 #796 with the help of https://github.com/clairernovotny and https://github.com/tmat

Improvements

Refactor DependencyInjection #728 by https://github.com/daveMueller

Release date 2020-04-02

Packages

coverlet.msbuild 2.8.1 coverlet.console 1.7.1 coverlet.collector 1.2.1

Fixed

Fix ExcludeFromCodeCoverage attribute bugs #129 and #670 with #671 by https://github.com/matteoerigozzi
Fix bug with nested types filtering #689
Fix Coverage Issue - New Using + Async/Await + ConfigureAwait #669
Improve branch detection for lambda functions and async/await statements #702 by https://github.com/matteoerigozzi
Improve coverage, hide compiler generated branches for try/catch blocks inside async state machine #716 by https://github.com/matteoerigozzi
Improve coverage, skip lambda cached field #753

Improvements

Trim whitespace between values when reading from configuration from runsettings #679 by https://github.com/EricStG
Code improvement, flow ILogger to InstrumentationHelper #727 by https://github.com/daveMueller
Add support for line branch coverage in OpenCover format #772 by https://github.com/costin-zaharia

Release date 2020-01-03

Packages

coverlet.msbuild 2.8.0 coverlet.console 1.7.0 coverlet.collector 1.2.0

Added

Add log to tracker #553
Exclude by assembly level System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage #589
Allow coverlet integration with other MSBuild test strategies#615 by https://github.com/sharwell

Fixed

Fix and simplify async coverage #549
Improve lambda scenario coverage #583
Mitigate issue in case of failure in assembly loading by cecil #625
Fix ConfigureAwait state machine generated branches #634
Fix coverage overwritten if the project has multiple target frameworks #636
Fix cobertura Jenkins reporter + source link support #614 by https://github.com/daveMueller
Fix pdb file locking during instrumentation #656

Improvements

Improve exception message for unsupported runtime #569 by https://github.com/daveMueller
Improve cobertura absolute/relative path report generation #661 by https://github.com/daveMueller

Release date 2019-09-23

Packages

coverlet.msbuild 2.7.0 coverlet.console 1.6.0 coverlet.collector 1.1.0

Added

Output multiple formats for vstest integration #533 by https://github.com/daveMueller
Different exit codes to indicate particular failures #412 by https://github.com/sasivishnu

Changed

Skip instrumentation of module with embedded pdb without local sources #510, with this today xunit will be skipped in automatic way.

Fixed

Fix exclude by files #524
Changed to calculate based on the average coverage of the module #479 by https://github.com/dlplenin
Fix property attribute detection #477 by https://github.com/amweiss
Fix instrumentation serialization bug #458
Fix culture for cobertura xml report #464