test delete hits file helper method

Author: tonerdo

src/coverlet.core/Helpers/InstrumentationHelper.cs

@@ -71,6 +71,7 @@ public static void RestoreOriginalModule(string module, string identifier)
                 currentSleep *= 2;
                 return sleep;
             };
+
             RetryHelper.Retry(() => {
                 File.Copy(backupPath, module, true);
                 File.Delete(backupPath);
@@ -87,6 +88,7 @@ public static void DeleteHitsFile(string path)
                 currentSleep *= 2;
                 return sleep;
             };
+
             RetryHelper.Retry(() => File.Delete(path), retryStrategy, 10);
         }
     }

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

@@ -59,5 +59,15 @@ public void TestDontCopyCoverletDependency()
             Assert.False(File.Exists(Path.Combine(directory.FullName, "coverlet.core.dll")));
             Directory.Delete(directory.FullName, true);
         }
+
+        [Fact]
+        public void TestDeleteHitsFile()
+        {
+            var tempFile = Path.GetTempFileName();
+            Assert.True(File.Exists(tempFile));
+
+            InstrumentationHelper.DeleteHitsFile(tempFile);
+            Assert.False(File.Exists(tempFile));
+        }
     }
 }