fix same file access exception

src/Microsoft.TestPlatform.Extensions.HtmlLogger/HtmlLogger.cs

@@ -36,6 +36,7 @@ public class HtmlLogger : ITestLoggerWithParameters
     private readonly IFileHelper _fileHelper;
     private readonly XmlObjectSerializer _xmlSerializer;
     private readonly IHtmlTransformer _htmlTransformer;
+    private static readonly object FileCreateLockObject = new();
     private Dictionary<string, string> _parametersDictionary;
 
     public HtmlLogger()
@@ -301,25 +302,25 @@ private void PopulateHtmlFile()
                 Environment.GetEnvironmentVariable("UserName"), Environment.MachineName,
                 FormatDateTimeForRunName(DateTime.Now));
 
-            XmlFilePath = GetFilePath(HtmlLoggerConstants.XmlFileExtension, fileName);
+            XmlFilePath = GenerateUniqueFilePath(fileName, HtmlLoggerConstants.XmlFileExtension);
 
-            using (var xmlStream = _fileHelper.GetStream(XmlFilePath, FileMode.Create))
+            using (var xmlStream = _fileHelper.GetStream(XmlFilePath, FileMode.OpenOrCreate))
             {
                 _xmlSerializer.WriteObject(xmlStream, TestRunDetails);
             }
 
             if (string.IsNullOrEmpty(HtmlFilePath))
             {
-                HtmlFilePath = GetFilePath(HtmlLoggerConstants.HtmlFileExtension, fileName);
+                HtmlFilePath = GenerateUniqueFilePath(fileName, HtmlLoggerConstants.HtmlFileExtension);
             }
 
             _htmlTransformer.Transform(XmlFilePath, HtmlFilePath);
         }
         catch (Exception ex)
         {
-            EqtTrace.Error("HtmlLogger : Failed to populate html file. Exception : {0}",
+            EqtTrace.Error("HtmlLogger: Failed to populate html file. Exception: {0}",
                 ex.ToString());
-            ConsoleOutput.Instance.Error(false, string.Concat(HtmlResource.HtmlLoggerError), ex.Message);
+            ConsoleOutput.Instance.Error(false, HtmlResource.HtmlLoggerError, ex.Message);
             return;
         }
         finally
@@ -335,10 +336,24 @@ private void PopulateHtmlFile()
         ConsoleOutput.Instance.Information(false, htmlFilePathMessage);
     }
 
-    private string GetFilePath(string fileExtension, string fileName)
+    private string GenerateUniqueFilePath(string fileName, string fileExtension)
     {
-        var fullFileFormat = $".{fileExtension}";
-        return Path.Combine(TestResultsDirPath, string.Concat("TestResult_", fileName, fullFileFormat));
+        string fullFilePath;
+        for (short i = 0; i < short.MaxValue; i++)
+        {
+            var fileNameWithIter = i == 0 ? fileName : Path.GetFileNameWithoutExtension(fileName) + $"[{i}]";
+            fullFilePath = Path.Combine(TestResultsDirPath, $"TestResult_{fileNameWithIter}.{fileExtension}");
+            lock (FileCreateLockObject)
+            {
+                if (!File.Exists(fullFilePath))
+                {
+                    using var _ = File.Create(fullFilePath);
+                    return fullFilePath;
+                }
+            }
+        }
+
+        throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, HtmlResource.CannotGenerateUniqueFilePath, fileName, TestResultsDirPath));
     }
 
     private string FormatDateTimeForRunName(DateTime timeStamp)

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/Resources.resx

@@ -117,6 +117,9 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
+  <data name="CannotGenerateUniqueFilePath" xml:space="preserve">
+    <value>Cannot generate a unique file name for name '{0}' on path '{1}'.</value>
+  </data>
   <data name="HtmlFilePath" xml:space="preserve">
     <value>Html test results file : {0}</value>
   </data>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.cs.xlf

@@ -17,6 +17,11 @@
         <target state="translated">Parametry LogFileName a LogFilePrefix nelze uvést společně.</target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.de.xlf

@@ -17,6 +17,11 @@
         <target state="translated">Die Parameter "LogFileName" und "LogFilePrefix" können nicht zusammen angegeben werden. </target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.es.xlf

@@ -17,6 +17,11 @@
         <target state="translated">Los parámetros LogFileName y LogFilePrefix no se pueden proporcionar juntos.</target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.fr.xlf

@@ -17,6 +17,11 @@
         <target state="translated">Les paramètres LogFileName et LogFilePrefix ne peuvent pas être donnés ensemble. </target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.it.xlf

@@ -17,6 +17,11 @@
         <target state="translated">Non è possibile specificare insieme i parametri LogFileName e LogFilePrefix.</target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.ja.xlf

@@ -17,6 +17,11 @@
         <target state="translated">パラメーター LogFileName と LogFilePrefix を同時に指定することはできません。</target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.ko.xlf

@@ -17,6 +17,11 @@
         <target state="translated">LogFileName 및 LogFilePrefix 매개 변수는 함께 제공할 수 없습니다.</target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.pl.xlf

@@ -17,6 +17,11 @@
         <target state="translated">Parametry LogFileName i LogFilePrefix nie mogą być podawane razem. </target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.pt-BR.xlf

@@ -17,6 +17,11 @@
         <target state="translated">Os parâmetros LogFileName e LogFilePrefix não podem ser usados juntos.</target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.ru.xlf

@@ -17,6 +17,11 @@
         <target state="translated">Параметры LogFileName и LogFilePrefix не могут использоваться вместе.</target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.tr.xlf

@@ -17,6 +17,11 @@
         <target state="translated">LogFileName ve LogFilePrefix parametreleri birlikte kullanılamaz. </target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.xlf

@@ -17,6 +17,11 @@
         <target state="new">The parameters LogFileName and LogFilePrefix cannot be given together.</target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.zh-Hans.xlf

@@ -17,6 +17,11 @@
         <target state="translated">参数 LogFileName 和 LogFilePrefix 不能一起使用。</target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

src/Microsoft.TestPlatform.Extensions.HtmlLogger/Resources/xlf/Resources.zh-Hant.xlf

@@ -17,6 +17,11 @@
         <target state="translated">不能同時指定參數 LogFileName 和 LogFilePrefix。</target>
         <note></note>
       </trans-unit>
+      <trans-unit id="CannotGenerateUniqueFilePath">
+        <source>Cannot generate a unique file name for name '{0}' on path '{1}'.</source>
+        <target state="new">Cannot generate a unique file name for name '{0}' on path '{1}'.</target>
+        <note></note>
+      </trans-unit>
     </body>
   </file>
 </xliff>

test/Microsoft.TestPlatform.AcceptanceTests/LoggerTests.cs

@@ -107,7 +107,7 @@ public void HtmlLoggerWithExecutorUriShouldProperlyOverwriteFile(RunnerInfo runn
 
         var arguments = PrepareArguments(GetSampleTestAssembly(), GetTestAdapterPath(), string.Empty, FrameworkArgValue, runnerInfo.InIsolationValue, TempDirectory.Path);
         var htmlFileName = "TestResults.html";
-        arguments = string.Concat(arguments, $" /logger:\"logger://Microsoft/TestPlatform/htmlLogger/v1;LogFileName{htmlFileName}\"");
+        arguments = string.Concat(arguments, $" /logger:\"logger://Microsoft/TestPlatform/htmlLogger/v1;LogFileName={htmlFileName}\"");
         InvokeVsTest(arguments);
 
         arguments = PrepareArguments(GetSampleTestAssembly(), GetTestAdapterPath(), string.Empty, FrameworkArgValue, runnerInfo.InIsolationValue, TempDirectory.Path);

test/Microsoft.TestPlatform.Extensions.HtmlLogger.UnitTests/HtmlLoggerTests.cs

@@ -396,7 +396,7 @@ public void TestCompleteHandlerShouldKeepTackOfSummary()
     }
 
     [TestMethod]
-    public void TestCompleteHandlerShouldCreateCustumHtmlFileNamewithLogFileNameKey()
+    public void TestCompleteHandlerShouldCreateCustomHtmlFileNamewithLogFileNameKey()
     {
         var parameters = new Dictionary<string, string?>
         {
@@ -415,7 +415,7 @@ public void TestCompleteHandlerShouldCreateCustumHtmlFileNamewithLogFileNameKey(
     }
 
     [TestMethod]
-    public void TestCompleteHandlerShouldCreateCustumHtmlFileNameWithLogPrefix()
+    public void TestCompleteHandlerShouldCreateCustomHtmlFileNameWithLogPrefix()
     {
         var parameters = new Dictionary<string, string>
         {
@@ -435,7 +435,7 @@ public void TestCompleteHandlerShouldCreateCustumHtmlFileNameWithLogPrefix()
     }
 
     [TestMethod]
-    public void TestCompleteHandlerShouldCreateCustumHtmlFileNameWithLogPrefixIfTargetFrameworkIsNull()
+    public void TestCompleteHandlerShouldCreateCustomHtmlFileNameWithLogPrefixIfTargetFrameworkIsNull()
     {
         var parameters = new Dictionary<string, string>
         {
@@ -455,7 +455,7 @@ public void TestCompleteHandlerShouldCreateCustumHtmlFileNameWithLogPrefixIfTarg
     }
 
     [TestMethod]
-    public void TestCompleteHandlerShouldCreateCustumHtmlFileNameWithLogPrefixNull()
+    public void TestCompleteHandlerShouldCreateCustomHtmlFileNameWithLogPrefixNull()
     {
         var parameters = new Dictionary<string, string?>
         {
@@ -468,14 +468,14 @@ public void TestCompleteHandlerShouldCreateCustumHtmlFileNameWithLogPrefixNull()
         var result1 = new ObjectModel.TestResult(testCase1) { Outcome = TestOutcome.Failed };
         var resultEventArg1 = new Mock<TestResultEventArgs>(result1);
 
-        _mockFileHelper.Setup(x => x.GetStream(It.IsAny<string>(), FileMode.Create, FileAccess.ReadWrite)).Callback<string, FileMode, FileAccess>((x, y, z) =>
+        _mockFileHelper.Setup(x => x.GetStream(It.IsAny<string>(), FileMode.OpenOrCreate, FileAccess.ReadWrite)).Callback<string, FileMode, FileAccess>((x, y, z) =>
         {
         }).Returns(new Mock<Stream>().Object);
 
         _htmlLogger.TestResultHandler(new object(), resultEventArg1.Object);
         _htmlLogger.TestRunCompleteHandler(new object(), new TestRunCompleteEventArgs(null, false, true, null, null, null, TimeSpan.Zero));
 
-        _mockFileHelper.Verify(x => x.GetStream(It.IsAny<string>(), FileMode.Create, FileAccess.ReadWrite), Times.Once);
+        _mockFileHelper.Verify(x => x.GetStream(It.IsAny<string>(), FileMode.OpenOrCreate, FileAccess.ReadWrite), Times.Once);
     }
 
     [TestMethod]
@@ -514,14 +514,14 @@ public void TestCompleteHandlerShouldCreateFileCorrectly()
         var result1 = new ObjectModel.TestResult(testCase1) { Outcome = TestOutcome.Failed };
         var resultEventArg1 = new Mock<TestResultEventArgs>(result1);
 
-        _mockFileHelper.Setup(x => x.GetStream(It.IsAny<string>(), FileMode.Create, FileAccess.ReadWrite)).Callback<string, FileMode, FileAccess>((x, y, z) =>
+        _mockFileHelper.Setup(x => x.GetStream(It.IsAny<string>(), FileMode.OpenOrCreate, FileAccess.ReadWrite)).Callback<string, FileMode, FileAccess>((x, y, z) =>
         {
         }).Returns(new Mock<Stream>().Object);
 
         _htmlLogger.TestResultHandler(new object(), resultEventArg1.Object);
         _htmlLogger.TestRunCompleteHandler(new object(), new TestRunCompleteEventArgs(null, false, true, null, null, null, TimeSpan.Zero));
 
-        _mockFileHelper.Verify(x => x.GetStream(It.IsAny<string>(), FileMode.Create, FileAccess.ReadWrite), Times.Once);
+        _mockFileHelper.Verify(x => x.GetStream(It.IsAny<string>(), FileMode.OpenOrCreate, FileAccess.ReadWrite), Times.Once);
     }
 
     [TestMethod]
@@ -548,7 +548,7 @@ public void TestCompleteHandlerShouldCallHtmlTransformerCorrectly()
         var result1 = new ObjectModel.TestResult(testCase1) { Outcome = TestOutcome.Failed };
         var resultEventArg1 = new Mock<TestResultEventArgs>(result1);
 
-        _mockFileHelper.Setup(x => x.GetStream(It.IsAny<string>(), FileMode.Create, FileAccess.ReadWrite)).Callback<string, FileMode, FileAccess>((x, y, z) =>
+        _mockFileHelper.Setup(x => x.GetStream(It.IsAny<string>(), FileMode.OpenOrCreate, FileAccess.ReadWrite)).Callback<string, FileMode, FileAccess>((x, y, z) =>
         {
         }).Returns(new Mock<Stream>().Object);
 
@@ -564,7 +564,7 @@ public void TestCompleteHandlerShouldWriteToXmlSerializerCorrectly()
         var testCase1 = CreateTestCase("TestCase1") ?? throw new ArgumentNullException($"CreateTestCase(\"TestCase1\")");
         var result1 = new ObjectModel.TestResult(testCase1) { Outcome = TestOutcome.Failed };
         var resultEventArg1 = new Mock<TestResultEventArgs>(result1);
-        _mockFileHelper.Setup(x => x.GetStream(It.IsAny<string>(), FileMode.Create, FileAccess.ReadWrite)).Callback<string, FileMode, FileAccess>((x, y, z) =>
+        _mockFileHelper.Setup(x => x.GetStream(It.IsAny<string>(), FileMode.OpenOrCreate, FileAccess.ReadWrite)).Callback<string, FileMode, FileAccess>((x, y, z) =>
         {
         }).Returns(new Mock<Stream>().Object);
 
@@ -579,7 +579,7 @@ public void TestCompleteHandlerShouldWriteToXmlSerializerCorrectly()
     [TestMethod]
     public void TestCompleteHandlerShouldNotDivideByZeroWhenThereAre0TestResults()
     {
-        _mockFileHelper.Setup(x => x.GetStream(It.IsAny<string>(), FileMode.Create, FileAccess.ReadWrite)).Callback<string, FileMode, FileAccess>((x, y, z) =>
+        _mockFileHelper.Setup(x => x.GetStream(It.IsAny<string>(), FileMode.OpenOrCreate, FileAccess.ReadWrite)).Callback<string, FileMode, FileAccess>((x, y, z) =>
         {
         }).Returns(new Mock<Stream>().Object);