Path is empty for VB My namespace

Documentation/Changelog.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 -Incorrect coverage for methods returning IAsyncEnumerable in generic classes [#1383](https://github.com/coverlet-coverage/coverlet/issues/1383)
 -Wrong branch coverage for async methods .NET Standard 1.x [#1376](https://github.com/coverlet-coverage/coverlet/issues/1376) 
+-Empty path exception in visual basic projects [#775](https://github.com/coverlet-coverage/coverlet/issues/775)
 -Allign published nuget package version to github release version [#1413](https://github.com/coverlet-coverage/coverlet/issues/1413)  
 -Sync nuget and github release versions [#1122](https://github.com/coverlet-coverage/coverlet/issues/1122)  
 

coverlet.sln

@@ -54,6 +54,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Build", "Build", "{9A8B19D4
 		test\Directory.Build.targets = test\Directory.Build.targets
 	EndProjectSection
 EndProject
+Project("{F184B08F-C81C-45F6-A57F-5ABD9991F28F}") = "coverlet.tests.projectsample.vbmynamespace", "test\coverlet.tests.projectsample.vbmynamespace\coverlet.tests.projectsample.vbmynamespace.vbproj", "{C9B7DC34-3E04-4F20-AED4-73791AF8020D}"
+EndProject
 Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "coverlet.tests.projectsample.fsharp", "test\coverlet.tests.projectsample.fsharp\coverlet.tests.projectsample.fsharp.fsproj", "{1CBF6966-2A67-4D2C-8598-D174B83072F4}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "coverlet.tests.projectsample.netframework", "test\coverlet.tests.projectsample.netframework\coverlet.tests.projectsample.netframework.csproj", "{E69D68C9-78ED-4076-A14B-D07295A4B2A5}"
@@ -120,6 +122,10 @@ Global
 		{F8199E19-FA9A-4559-9101-CAD7028121B4}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{F8199E19-FA9A-4559-9101-CAD7028121B4}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{F8199E19-FA9A-4559-9101-CAD7028121B4}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C9B7DC34-3E04-4F20-AED4-73791AF8020D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C9B7DC34-3E04-4F20-AED4-73791AF8020D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C9B7DC34-3E04-4F20-AED4-73791AF8020D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C9B7DC34-3E04-4F20-AED4-73791AF8020D}.Release|Any CPU.Build.0 = Release|Any CPU
 		{1CBF6966-2A67-4D2C-8598-D174B83072F4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{1CBF6966-2A67-4D2C-8598-D174B83072F4}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{1CBF6966-2A67-4D2C-8598-D174B83072F4}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -150,6 +156,7 @@ Global
 		{9A8B19D4-4A24-4217-AEFE-159B68F029A1} = {2FEBDE1B-83E3-445B-B9F8-5644B0E0E134}
 		{1CBF6966-2A67-4D2C-8598-D174B83072F4} = {2FEBDE1B-83E3-445B-B9F8-5644B0E0E134}
 		{E69D68C9-78ED-4076-A14B-D07295A4B2A5} = {2FEBDE1B-83E3-445B-B9F8-5644B0E0E134}
+		{C9B7DC34-3E04-4F20-AED4-73791AF8020D} = {2FEBDE1B-83E3-445B-B9F8-5644B0E0E134}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {9CA57C02-97B0-4C38-A027-EA61E8741F10}

src/coverlet.core/Instrumentation/Instrumenter.cs

@@ -531,6 +531,9 @@ private void InstrumentType(TypeDefinition type)
         private void InstrumentMethod(MethodDefinition method)
         {
             string sourceFile = method.DebugInformation.SequencePoints.Select(s => _sourceRootTranslator.ResolveFilePath(s.Document.Url)).FirstOrDefault();
+
+            if (string.IsNullOrEmpty(sourceFile)) return;
+
             if (!string.IsNullOrEmpty(sourceFile) && _excludedFilesHelper.Exclude(sourceFile))
             {
                 if (!(_excludedSourceFiles ??= new List<string>()).Contains(sourceFile))

test/coverlet.core.tests/Instrumentation/InstrumenterTests.cs

@@ -615,15 +615,8 @@ public int SampleMethod()
             var instrumenter = new Instrumenter(excludedbyattributeDll, "_xunit_excludedbyattribute", parametes, loggerMock.Object, instrumentationHelper, partialMockFileSystem.Object, new SourceRootTranslator(loggerMock.Object, new FileSystem()), new CecilSymbolHelper());
 
             InstrumenterResult result = instrumenter.Instrument();
-            if (expectedExcludes)
-            {
-                Assert.Empty(result.Documents);
-                loggerMock.Verify(l => l.LogVerbose(It.IsAny<string>()));
-            }
-            else
-            {
-                Assert.NotEmpty(result.Documents);
-            }
+            Assert.Empty(result.Documents);
+            if (expectedExcludes) { loggerMock.Verify(l => l.LogVerbose(It.IsAny<string>())); }
         }
 
         [Fact]
@@ -807,5 +800,36 @@ public void TestReachabilityHelper()
 
             instrumenterTest.Directory.Delete(true);
         }
+
+        [Fact]
+        public void Instrumenter_MethodsWithoutReferenceToSource_AreSkipped()
+        {
+            var loggerMock = new Mock<ILogger>();
+
+            string module = Directory.GetFiles(Directory.GetCurrentDirectory(), "coverlet.tests.projectsample.vbmynamespace.dll").First();
+            string pdb = Path.Combine(Path.GetDirectoryName(module), Path.GetFileNameWithoutExtension(module) + ".pdb");
+
+            DirectoryInfo directory = Directory.CreateDirectory(Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString()));
+
+            File.Copy(module, Path.Combine(directory.FullName, Path.GetFileName(module)), true);
+            File.Copy(pdb, Path.Combine(directory.FullName, Path.GetFileName(pdb)), true);
+
+            var instrumentationHelper =
+                new InstrumentationHelper(new ProcessExitHandler(), new RetryHelper(), new FileSystem(), new Mock<ILogger>().Object,
+                    new SourceRootTranslator(module, new Mock<ILogger>().Object, new FileSystem()));
+
+            CoverageParameters parameters = new();
+
+            var instrumenter = new Instrumenter(Path.Combine(directory.FullName, Path.GetFileName(module)), "_coverlet_tests_projectsample_vbmynamespace", parameters,
+                loggerMock.Object, instrumentationHelper, new FileSystem(), new SourceRootTranslator(Path.Combine(directory.FullName, Path.GetFileName(module)), loggerMock.Object, new FileSystem()), new CecilSymbolHelper());
+
+            instrumentationHelper.BackupOriginalModule(Path.Combine(directory.FullName, Path.GetFileName(module)), "_coverlet_tests_projectsample_vbmynamespace");
+
+            InstrumenterResult result = instrumenter.Instrument();
+
+            Assert.False(result.Documents.ContainsKey(string.Empty));
+
+            directory.Delete(true);
+        }
     }
 }

test/coverlet.core.tests/coverlet.core.tests.csproj

@@ -29,6 +29,7 @@
     <ProjectReference Include="$(RepoRoot)test\coverlet.core.tests.samples.netstandard\coverlet.core.tests.samples.netstandard.csproj" />
     <ProjectReference Include="$(RepoRoot)test\coverlet.tests.xunit.extensions\coverlet.tests.xunit.extensions.csproj" />
     <ProjectReference Include="$(RepoRoot)test\coverlet.tests.projectsample.netframework\coverlet.tests.projectsample.netframework.csproj" />
+    <ProjectReference Include="$(RepoRoot)test\coverlet.tests.projectsample.vbmynamespace\coverlet.tests.projectsample.vbmynamespace.vbproj" />
   </ItemGroup>
 
   <ItemGroup>

test/coverlet.tests.projectsample.vbmynamespace/SampleVbClass.vb

@@ -0,0 +1,5 @@
+Public Class SampleVbClass
+    Sub SampleSub()
+        Return
+    End Sub
+End Class

test/coverlet.tests.projectsample.vbmynamespace/coverlet.tests.projectsample.vbmynamespace.vbproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <RootNamespace>coverlet.tests.projectsample.vbmynamespace</RootNamespace>
+    <TargetFramework>net48</TargetFramework>
+    <LangVersion>latest</LangVersion>
+  </PropertyGroup>
+
+</Project>