add tests for including test assembly

Author: tonerdo

test/coverlet.core.tests/CoverageTests.cs

@@ -31,5 +31,28 @@ public void TestCoverage()
 
             directory.Delete(true);
         }
+
+        [Fact]
+        public void TestCoverageWithTestAssembly()
+        {
+            string module = GetType().Assembly.Location;
+            string pdb = Path.Combine(Path.GetDirectoryName(module), Path.GetFileNameWithoutExtension(module) + ".pdb");
+
+            var 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);
+
+            // TODO: Find a way to mimick hits
+
+            var coverage = new Coverage(Path.Combine(directory.FullName, Path.GetFileName(module)), Array.Empty<string>(), Array.Empty<string>(), Array.Empty<string>(), Array.Empty<string>(), Array.Empty<string>(), true, false, string.Empty, false, new Mock<ILogger>().Object);
+            coverage.PrepareModules();
+
+            var result = coverage.GetCoverageResult();
+
+            Assert.NotEmpty(result.Modules);
+
+            directory.Delete(true);
+        }
     }
 }

test/coverlet.core.tests/Helpers/InstrumentationHelperTests.cs

@@ -16,6 +16,14 @@ public void TestGetDependencies()
             Assert.False(Array.Exists(modules, m => m == module));
         }
 
+        [Fact]
+        public void TestGetDependenciesWithTestAssembly()
+        {
+            string module = typeof(InstrumentationHelperTests).Assembly.Location;
+            var modules = InstrumentationHelper.GetCoverableModules(module, Array.Empty<string>(), true);
+            Assert.True(Array.Exists(modules, m => m == module));
+        }
+
         [Fact]
         public void TestHasPdb()
         {