Fix warnings on main (IDE only)

src/Microsoft.TestPlatform.Common/DataCollection/DataCollectionManager.cs

@@ -116,11 +116,8 @@ private DataCollectorExtensionManager DataCollectorExtensionManager
     {
         get
         {
-            if (_dataCollectorExtensionManager == null)
-            {
-                // TODO : change IMessageSink and use IMessageLogger instead.
-                _dataCollectorExtensionManager = DataCollectorExtensionManager.Create(TestSessionMessageLogger.Instance);
-            }
+            // TODO : change IMessageSink and use IMessageLogger instead.
+            _dataCollectorExtensionManager ??= DataCollectorExtensionManager.Create(TestSessionMessageLogger.Instance);
 
             return _dataCollectorExtensionManager;
         }
@@ -141,10 +138,7 @@ public static DataCollectionManager Create(IMessageSink messageSink, IRequestDat
         {
             lock (SyncObject)
             {
-                if (Instance == null)
-                {
-                    Instance = new DataCollectionManager(messageSink, requestData);
-                }
+                Instance ??= new DataCollectionManager(messageSink, requestData);
             }
         }
 

src/Microsoft.TestPlatform.Common/ExtensionFramework/TestPluginCache.cs

@@ -152,10 +152,7 @@ public List<string> GetExtensionPaths(string endsWithPattern, bool skipDefaultEx
             // Discover the test extensions from candidate assemblies.
             pluginInfos = GetTestExtensions<TPluginInfo, TExtension>(allExtensionPaths);
 
-            if (TestExtensions == null)
-            {
-                TestExtensions = new TestExtensions();
-            }
+            TestExtensions ??= new TestExtensions();
 
             TestExtensions.AddExtension(pluginInfos);
 
@@ -333,10 +330,7 @@ internal Dictionary<string, TPluginInfo> GetTestExtensions<TPluginInfo, TExtensi
         var pluginInfos = GetTestExtensions<TPluginInfo, TExtension>(new List<string>() { extensionAssembly });
 
         // Add extensions discovered to the cache.
-        if (TestExtensions == null)
-        {
-            TestExtensions = new TestExtensions();
-        }
+        TestExtensions ??= new TestExtensions();
 
         TestExtensions.AddExtension(pluginInfos);
 

src/Microsoft.TestPlatform.Common/ExtensionFramework/VSExtensionManager.cs

@@ -130,10 +130,7 @@ private Assembly ExtensionManagerDefAssembly
     {
         get
         {
-            if (_extensionManagerAssembly == null)
-            {
-                _extensionManagerAssembly = Assembly.Load(new AssemblyName(ExtensionManagerAssemblyName));
-            }
+            _extensionManagerAssembly ??= Assembly.Load(new AssemblyName(ExtensionManagerAssemblyName));
             return _extensionManagerAssembly;
         }
     }
@@ -183,10 +180,7 @@ private Assembly SettingsManagerAssembly
     {
         get
         {
-            if (_settingsManagerAssembly == null)
-            {
-                _settingsManagerAssembly = Assembly.Load(new AssemblyName(SettingsManagerAssemblyName));
-            }
+            _settingsManagerAssembly ??= Assembly.Load(new AssemblyName(SettingsManagerAssemblyName));
 
             return _settingsManagerAssembly;
         }

src/Microsoft.TestPlatform.Common/RunSettingsManager.cs

@@ -46,10 +46,7 @@ public static RunSettingsManager Instance
 
             lock (LockObject)
             {
-                if (s_runSettingsManagerInstance == null)
-                {
-                    s_runSettingsManagerInstance = new RunSettingsManager();
-                }
+                s_runSettingsManagerInstance ??= new RunSettingsManager();
             }
 
             return s_runSettingsManagerInstance;

src/Microsoft.TestPlatform.Common/Utilities/MetadataReaderHelper.cs

@@ -165,7 +165,7 @@ private static Type[] DiscoverTestExtensionTypesV2AttributeInternal(Assembly loa
                                     continue;
                                 }
 
-                                if (extensions is null) extensions = new List<Tuple<int, Type>>();
+                                extensions ??= new List<Tuple<int, Type>>();
                                 extensions.Add(Tuple.Create(version, extensionType));
                                 EqtTrace.Verbose($"MetadataReaderExtensionsHelper: Valid extension found: extension type '{extension}' identifier '{extensionIdentifier}' implementation '{extensionType}' version '{version}'");
                             }

src/Microsoft.TestPlatform.Common/Utilities/SimpleJSON.cs

@@ -465,8 +465,7 @@ internal static StringBuilder EscapeBuilder
     {
         get
         {
-            if (s_escapeBuilder == null)
-                s_escapeBuilder = new StringBuilder();
+            s_escapeBuilder ??= new StringBuilder();
             return s_escapeBuilder;
         }
     }

src/Microsoft.TestPlatform.CommunicationUtilities/DataCollectionTestCaseEventSender.cs

@@ -53,10 +53,7 @@ public static DataCollectionTestCaseEventSender Create()
         {
             lock (SyncObject)
             {
-                if (Instance == null)
-                {
-                    Instance = new DataCollectionTestCaseEventSender();
-                }
+                Instance ??= new DataCollectionTestCaseEventSender();
             }
         }
 

src/Microsoft.TestPlatform.CommunicationUtilities/JsonDataSerializer.cs

@@ -419,10 +419,7 @@ private static T Deserialize<T>(JsonSerializer serializer, JToken jToken)
 
     private static JsonSerializer GetPayloadSerializer(int? version)
     {
-        if (version == null)
-        {
-            version = 1;
-        }
+        version ??= 1;
 
         return version switch
         {

src/Microsoft.TestPlatform.CoreUtilities/Output/ConsoleOutput.cs

@@ -42,10 +42,7 @@ public static ConsoleOutput Instance
 
             lock (LockObject)
             {
-                if (s_consoleOutput == null)
-                {
-                    s_consoleOutput = new ConsoleOutput();
-                }
+                s_consoleOutput ??= new ConsoleOutput();
             }
 
             return s_consoleOutput;

src/Microsoft.TestPlatform.CrossPlatEngine/Client/ProxyDiscoveryManager.cs

@@ -215,10 +215,7 @@ public void Abort(ITestDiscoveryEventsHandler2 eventHandler)
             return;
         }
 
-        if (_baseTestDiscoveryEventsHandler is null)
-        {
-            _baseTestDiscoveryEventsHandler = eventHandler;
-        }
+        _baseTestDiscoveryEventsHandler ??= eventHandler;
 
         if (_isCommunicationEstablished)
         {

src/Microsoft.TestPlatform.CrossPlatEngine/Client/ProxyExecutionManager.cs

@@ -276,10 +276,7 @@ public virtual int StartTestRun(TestRunCriteria testRunCriteria, IInternalTestRu
     public virtual void Cancel(IInternalTestRunEventsHandler eventHandler)
     {
         // Just in case ExecuteAsync isn't called yet, set the eventhandler.
-        if (_baseTestRunEventsHandler == null)
-        {
-            _baseTestRunEventsHandler = eventHandler;
-        }
+        _baseTestRunEventsHandler ??= eventHandler;
 
         // Do nothing if the proxy is not initialized yet.
         if (_proxyOperationManager == null)
@@ -299,10 +296,7 @@ public virtual void Cancel(IInternalTestRunEventsHandler eventHandler)
     public void Abort(IInternalTestRunEventsHandler eventHandler)
     {
         // Just in case ExecuteAsync isn't called yet, set the eventhandler.
-        if (_baseTestRunEventsHandler == null)
-        {
-            _baseTestRunEventsHandler = eventHandler;
-        }
+        _baseTestRunEventsHandler ??= eventHandler;
 
         // Do nothing if the proxy is not initialized yet.
         if (_proxyOperationManager == null)
@@ -355,10 +349,7 @@ public bool AttachDebuggerToProcess(AttachDebuggerInfo attachDebuggerInfo)
         // TestHost did not provide any additional TargetFramework info for the process it wants to attach to,
         // specify the TargetFramework of the testhost, in case it is just an old testhost that is not aware
         // of this capability.
-        if (attachDebuggerInfo.TargetFramework is null)
-        {
-            attachDebuggerInfo.TargetFramework = _proxyOperationManager?.TestHostManagerFramework?.ToString();
-        };
+        attachDebuggerInfo.TargetFramework ??= _proxyOperationManager?.TestHostManagerFramework?.ToString();
 
         if (attachDebuggerInfo.Sources is null || !attachDebuggerInfo.Sources.Any())
         {

src/Microsoft.TestPlatform.CrossPlatEngine/Client/ProxyExecutionManagerWithDataCollection.cs

@@ -148,10 +148,7 @@ public override int LaunchProcessWithDebuggerAttached(TestProcessStartInfo testP
     {
         if (_dataCollectionEnvironmentVariables != null)
         {
-            if (testProcessStartInfo.EnvironmentVariables == null)
-            {
-                testProcessStartInfo.EnvironmentVariables = new Dictionary<string, string?>();
-            }
+            testProcessStartInfo.EnvironmentVariables ??= new Dictionary<string, string?>();
 
             foreach (var envVariable in _dataCollectionEnvironmentVariables)
             {

src/Microsoft.TestPlatform.CrossPlatEngine/Client/TestLoggerManager.cs

@@ -117,10 +117,7 @@ private TestLoggerExtensionManager TestLoggerExtensionManager
     {
         get
         {
-            if (_testLoggerExtensionManager == null)
-            {
-                _testLoggerExtensionManager = TestLoggerExtensionManager.Create(_messageLogger);
-            }
+            _testLoggerExtensionManager ??= TestLoggerExtensionManager.Create(_messageLogger);
 
             return _testLoggerExtensionManager;
         }

src/Microsoft.TestPlatform.CrossPlatEngine/Execution/MSTestV1TelemetryHelper.cs

@@ -30,22 +30,16 @@ internal static void AddTelemetry(TestResult testResult, IDictionary<string, int
         // add additional info for mstestadapter/v1
         if (IsMsTestV1Adapter(executorUri))
         {
-            if (s_testTypeProperty == null)
-            {
-                // this is present when the legacy runner is used, and contains a guid which
-                // is the test type.
-                // GenericTestType 982B8C01-1A8A-48F5-B98A-67EE64BC8687
-                // OrderedTestType ec4800e8-40e5-4ab3-8510-b8bf29b1904d
-                // UnitTestType 13CDC9D9-DDB5-4fa4-A97D-D965CCFC6D4B
-                // WebTestType 4e7599fa-5ecb-43e9-a887-cd63cf72d207
-                // CodedWebTestType 37e36796-fb51-4610-8d5c-e00ceaa68b9f
-                s_testTypeProperty = TestProperty.Register("TestType", "TestType", typeof(Guid), typeof(TestResult));
-            }
+            // this is present when the legacy runner is used, and contains a guid which
+            // is the test type.
+            // GenericTestType 982B8C01-1A8A-48F5-B98A-67EE64BC8687
+            // OrderedTestType ec4800e8-40e5-4ab3-8510-b8bf29b1904d
+            // UnitTestType 13CDC9D9-DDB5-4fa4-A97D-D965CCFC6D4B
+            // WebTestType 4e7599fa-5ecb-43e9-a887-cd63cf72d207
+            // CodedWebTestType 37e36796-fb51-4610-8d5c-e00ceaa68b9f
+            s_testTypeProperty ??= TestProperty.Register("TestType", "TestType", typeof(Guid), typeof(TestResult));
 
-            if (s_extensionIdProperty == null)
-            {
-                s_extensionIdProperty = TestProperty.Register("ExtensionId", "ExtensionId", typeof(string), typeof(TestResult));
-            }
+            s_extensionIdProperty ??= TestProperty.Register("ExtensionId", "ExtensionId", typeof(string), typeof(TestResult));
             // Get addional data from test result passed by MSTestv1
             // Only legacy tests have testtype.
 

src/Microsoft.TestPlatform.CrossPlatEngine/TestSession/TestSessionPool.cs

@@ -46,10 +46,7 @@ public static TestSessionPool Instance
             {
                 lock (InstanceLockObject)
                 {
-                    if (s_instance == null)
-                    {
-                        s_instance = new TestSessionPool();
-                    }
+                    s_instance ??= new TestSessionPool();
                 }
             }
 

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

@@ -256,8 +256,7 @@ private void AddToParentResult(Guid parentExecutionId, ObjectModel.TestResult te
 
         if (Results.TryGetValue(parentExecutionId, out var parentTestResult))
         {
-            if (parentTestResult.InnerTestResults == null)
-                parentTestResult.InnerTestResults = new List<ObjectModel.TestResult>();
+            parentTestResult.InnerTestResults ??= new List<ObjectModel.TestResult>();
 
             parentTestResult.InnerTestResults.Add(testResult);
         }

src/Microsoft.TestPlatform.Extensions.TrxLogger/ObjectModel/TestCategoryItems.cs

@@ -26,10 +26,7 @@ internal sealed class TestCategoryItem : IXmlTestStore
     public TestCategoryItem(string? category)
     {
         // Treat null as empty.
-        if (category == null)
-        {
-            category = string.Empty;
-        }
+        category ??= string.Empty;
 
 
         _category = StripIllegalChars(category);

src/Microsoft.TestPlatform.Extensions.TrxLogger/ObjectModel/TestEntry.cs

@@ -45,10 +45,7 @@ public List<TestEntry> TestEntries
     {
         get
         {
-            if (_testEntries == null)
-            {
-                _testEntries = new List<TestEntry>();
-            }
+            _testEntries ??= new List<TestEntry>();
 
             return _testEntries;
         }

src/Microsoft.TestPlatform.Extensions.TrxLogger/ObjectModel/TestListCategory.cs

@@ -66,11 +66,8 @@ public static TestListCategory UncategorizedResults
             {
                 lock (ReservedCategoryLock)
                 {
-                    if (s_uncategorizedResults == null)
-                    {
-                        s_uncategorizedResults = new TestListCategory(
+                    s_uncategorizedResults ??= new TestListCategory(
                             TrxLoggerResources.TS_UncategorizedResults, TestListCategoryId.Uncategorized, TestListCategoryId.Root);
-                    }
                 }
             }
 
@@ -89,11 +86,8 @@ public static TestListCategory AllResults
             {
                 lock (ReservedCategoryLock)
                 {
-                    if (s_allResults == null)
-                    {
-                        s_allResults = new TestListCategory(
+                    s_allResults ??= new TestListCategory(
                             TrxLoggerResources.TS_AllResults, TestListCategoryId.AllItems, TestListCategoryId.Root);
-                    }
                 }
             }
 

src/Microsoft.TestPlatform.Extensions.TrxLogger/ObjectModel/TestResult.cs

@@ -299,8 +299,7 @@ public string ErrorMessage
         get { return _errorInfo?.Message ?? string.Empty; }
         set
         {
-            if (_errorInfo == null)
-                _errorInfo = new TestResultErrorInfo();
+            _errorInfo ??= new TestResultErrorInfo();
 
             _errorInfo.Message = value;
         }
@@ -315,8 +314,7 @@ public string ErrorStackTrace
 
         set
         {
-            if (_errorInfo == null)
-                _errorInfo = new TestResultErrorInfo();
+            _errorInfo ??= new TestResultErrorInfo();
 
             _errorInfo.StackTrace = value;
         }

src/Microsoft.TestPlatform.Extensions.TrxLogger/ObjectModel/TestResultAggregation.cs

@@ -37,10 +37,7 @@ public List<ITestResult> InnerResults
     {
         get
         {
-            if (_innerResults == null)
-            {
-                _innerResults = new List<ITestResult>();
-            }
+            _innerResults ??= new List<ITestResult>();
             return _innerResults;
         }
     }

src/Microsoft.TestPlatform.Extensions.TrxLogger/Utility/Collection.cs

@@ -183,11 +183,8 @@ private string ChildElementName
     {
         get
         {
-            if (_childElementName == null)
-            {
-                // All we can do here is to delegate to T. Cannot cast T to IXmlTestStoreCustom as T is a type, not an instance.
-                _childElementName = typeof(T).Name;
-            }
+            // All we can do here is to delegate to T. Cannot cast T to IXmlTestStoreCustom as T is a type, not an instance.
+            _childElementName ??= typeof(T).Name;
             return _childElementName;
         }
     }