Use "Unclassified" when no class name is available

Fixes #556

__tests__/__outputs__/dotnet-xunitv3.md

@@ -0,0 +1,26 @@
+![Tests failed](https://img.shields.io/badge/tests-1%20passed%2C%203%20failed-critical)
+|Report|Passed|Failed|Skipped|Time|
+|:---|---:|---:|---:|---:|
+|[fixtures/dotnet-xunitv3.trx](#user-content-r0)|1 ✅|3 ❌||267ms|
+## ❌ <a id="user-content-r0" href="#user-content-r0">fixtures/dotnet-xunitv3.trx</a>
+**4** tests were completed in **267ms** with **1** passed, **3** failed and **0** skipped.
+|Test suite|Passed|Failed|Skipped|Time|
+|:---|---:|---:|---:|---:|
+|[DotnetTests.XUnitV3Tests.FixtureTests](#user-content-r0s0)|1 ✅|1 ❌||18ms|
+|[Unclassified](#user-content-r0s1)||2 ❌||0ms|
+### ❌ <a id="user-content-r0s0" href="#user-content-r0s0">DotnetTests.XUnitV3Tests.FixtureTests</a>
+```
+❌ Failing_Test
+	Assert.Null() Failure: Value is not null
+	Expected: null
+	Actual:   Fixture { }
+	   at DotnetTests.XUnitV3Tests.FixtureTests.Failing_Test() in /_/reports/dotnet/DotnetTests.XUnitV3Tests/FixtureTests.cs:line 25
+	   at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
+	   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)
+✅ Passing_Test
+```
+### ❌ <a id="user-content-r0s1" href="#user-content-r0s1">Unclassified</a>
+```
+❌ [Test Class Cleanup Failure (DotnetTests.XUnitV3Tests.FixtureTests.Failing_Test)]
+❌ [Test Class Cleanup Failure (DotnetTests.XUnitV3Tests.FixtureTests.Passing_Test)]
+```

__tests__/__snapshots__/dotnet-trx.test.ts.snap

@@ -135,6 +135,76 @@ Actual:   False
 }
 `;
 
+exports[`dotnet-trx tests matches dotnet-xunitv3 report snapshot 1`] = `
+TestRunResult {
+  "path": "fixtures/dotnet-xunitv3.trx",
+  "suites": [
+    TestSuiteResult {
+      "groups": [
+        TestGroupResult {
+          "name": null,
+          "tests": [
+            TestCaseResult {
+              "error": {
+                "details": "Assert.Null() Failure: Value is not null
+Expected: null
+Actual:   Fixture { }
+   at DotnetTests.XUnitV3Tests.FixtureTests.Failing_Test() in /_/reports/dotnet/DotnetTests.XUnitV3Tests/FixtureTests.cs:line 25
+   at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
+   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)",
+                "line": 25,
+                "message": "Assert.Null() Failure: Value is not null
+Expected: null
+Actual:   Fixture { }
+   at DotnetTests.XUnitV3Tests.FixtureTests.Failing_Test() in /_/reports/dotnet/DotnetTests.XUnitV3Tests/FixtureTests.cs:line 25
+   at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
+   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)",
+                "path": "DotnetTests.XUnitV3Tests/FixtureTests.cs",
+              },
+              "name": "Failing_Test",
+              "result": "failed",
+              "time": 17.0545,
+            },
+            TestCaseResult {
+              "error": undefined,
+              "name": "Passing_Test",
+              "result": "success",
+              "time": 0.8786,
+            },
+          ],
+        },
+      ],
+      "name": "DotnetTests.XUnitV3Tests.FixtureTests",
+      "totalTime": undefined,
+    },
+    TestSuiteResult {
+      "groups": [
+        TestGroupResult {
+          "name": null,
+          "tests": [
+            TestCaseResult {
+              "error": undefined,
+              "name": "[Test Class Cleanup Failure (DotnetTests.XUnitV3Tests.FixtureTests.Failing_Test)]",
+              "result": "failed",
+              "time": 0,
+            },
+            TestCaseResult {
+              "error": undefined,
+              "name": "[Test Class Cleanup Failure (DotnetTests.XUnitV3Tests.FixtureTests.Passing_Test)]",
+              "result": "failed",
+              "time": 0,
+            },
+          ],
+        },
+      ],
+      "name": "Unclassified",
+      "totalTime": undefined,
+    },
+  ],
+  "totalTime": 267,
+}
+`;
+
 exports[`dotnet-trx tests matches report snapshot (only failed tests) 1`] = `
 TestRunResult {
   "path": "fixtures/dotnet-trx.trx",

dist/index.js

@@ -974,7 +974,7 @@ class DotnetTrxParser {
         }));
         const testClasses = {};
         for (const r of unitTestsResults) {
-            const className = r.test.TestMethod[0].$.className;
+            const className = r.test.TestMethod[0].$.className ?? "Unclassified";
             let tc = testClasses[className];
             if (tc === undefined) {
                 tc = new TestClass(className);

src/parsers/dotnet-trx/dotnet-trx-parser.ts

@@ -81,7 +81,7 @@ export class DotnetTrxParser implements TestParser {
 
     const testClasses: {[name: string]: TestClass} = {}
     for (const r of unitTestsResults) {
-      const className = r.test.TestMethod[0].$.className
+      const className = r.test.TestMethod[0].$.className ?? "Unclassified"
       let tc = testClasses[className]
       if (tc === undefined) {
         tc = new TestClass(className)