Add test source linking with filepart@testname pattern

README.md

@@ -157,9 +157,50 @@ mappings:
 - **Child Requirements**: Requirements can reference other requirements as children using the `children` field
 - **Test Mappings**: Tests can be mapped to requirements either inline (within the requirement definition) or
   separately (using the `mappings` section)
+- **Test Source Linking**: Support for source-specific test matching using the `[filepart@]testname` pattern,
+  allowing requirements to specify tests from specific result files (e.g., `windows-latest@MyTest`)
 - **File Includes**: Use the `includes` section to reference other YAML files containing additional requirements
   or test mappings
 
+### Test Source Linking
+
+When testing requirements across multiple platforms or configurations, test result files often include platform
+identifiers in their names (e.g., `test-results-windows-latest.trx`, `test-results-ubuntu-latest.junit.xml`).
+Test source linking allows requirements to specify which test results should come from which source files.
+
+**Pattern**: `[filepart@]testname`
+
+- `filepart` (optional): A substring that matches the base filename (without extension) of the test result file.
+  Matching is case-insensitive and supports partial matches.
+- `testname`: The exact name of the test as it appears in the test result file.
+
+**Examples**:
+
+```yaml
+requirements:
+  - id: "PLAT-001"
+    title: "Shall support Windows"
+    tests:
+      - "windows-latest@Test_PlatformFeature"  # Matches only from files containing "windows-latest"
+
+  - id: "PLAT-002"
+    title: "Shall support Linux"
+    tests:
+      - "ubuntu-latest@Test_PlatformFeature"   # Matches only from files containing "ubuntu-latest"
+
+  - id: "PLAT-003"
+    title: "Shall support cross-platform features"
+    tests:
+      - "Test_CrossPlatformFeature"             # Aggregates from all test result files
+```
+
+**Key behaviors**:
+
+- Tests with source specifiers only match results from files containing the specified `filepart`
+- Tests without source specifiers aggregate results from all test result files (backward compatible)
+- File part matching is case-insensitive and supports partial filename matching
+- Both plain and source-specific test names can be mixed in the same requirement
+
 ## Development
 
 ### Requirements

docs/guide/guide.md

@@ -237,6 +237,53 @@ mappings:
 The separate `mappings` section is useful when test mappings are maintained by a different team or in a different
 file from the requirements.
 
+### Test Source Linking
+
+When testing requirements across multiple platforms or configurations, use test source linking to distinguish tests
+from different sources. This is particularly useful for matrix testing scenarios.
+
+**Pattern**: `[filepart@]testname`
+
+- `filepart` (optional): A substring matching the base filename (without extension) of the test result file
+- `testname`: The exact test name from the test result file
+
+**Example - Platform-specific testing:**
+
+```yaml
+requirements:
+  - id: "PLAT-001"
+    title: "Shall support Windows operating systems"
+    tests:
+      - "windows-latest@Test_PlatformBasic"
+      - "windows-latest@Test_FileSystem"
+
+  - id: "PLAT-002"
+    title: "Shall support Linux operating systems"
+    tests:
+      - "ubuntu-latest@Test_PlatformBasic"
+      - "ubuntu-latest@Test_FileSystem"
+
+  - id: "PLAT-003"
+    title: "Shall support cross-platform APIs"
+    tests:
+      - "Test_CrossPlatformAPI"  # Aggregates from all platforms
+```
+
+With test result files:
+- `test-results-windows-latest.trx`
+- `test-results-ubuntu-latest.trx`
+- `test-results-macos-latest.trx`
+
+The `windows-latest@Test_PlatformBasic` test will only match results from files containing "windows-latest" in their
+base filename. The `Test_CrossPlatformAPI` test without a source specifier will aggregate results from all three
+files.
+
+**Key features:**
+
+- Case-insensitive matching: `windows@Test` matches `test-results-WINDOWS-latest.trx`
+- Partial matching: `ubuntu@Test` matches `test-results-ubuntu-22.04-latest.trx`
+- Backward compatible: Tests without `filepart@` prefix work as before
+
 ### File Includes
 
 Large projects can be split across multiple YAML files using the `includes` section:
@@ -662,6 +709,32 @@ trace matrix.
 A: No, test names must be specified exactly. However, you can use patterns when specifying test result files
 (`--tests "**/*.trx"`).
 
+**Q: How can I link tests to specific test result files?**
+
+A: Use the test source linking feature with the `[filepart@]testname` pattern. The `filepart` is a substring that
+matches the base filename (without extension) of the test result file. For example:
+
+```yaml
+requirements:
+  - id: "WIN-001"
+    title: "Shall support Windows"
+    tests:
+      - "windows-latest@Test_PlatformFeature"  # Matches only from files containing "windows-latest"
+
+  - id: "LIN-001"
+    title: "Shall support Linux"
+    tests:
+      - "ubuntu-latest@Test_PlatformFeature"   # Matches only from files containing "ubuntu-latest"
+```
+
+File part matching is case-insensitive and supports partial matches. Tests without the `filepart@` prefix continue to
+aggregate results from all test result files (backward compatible).
+
+**Q: Can I mix plain and source-specific test names?**
+
+A: Yes, you can mix both styles in the same requirement. Plain test names will aggregate results from all test result
+files, while source-specific test names will only match their specified sources.
+
 ### Export Questions
 
 **Q: Can I customize the markdown format of reports?**

requirements.yaml

@@ -120,6 +120,32 @@ sections:
               - "Create_WithTestsPattern_ExpandsGlobPattern"
               - "TraceMatrix_WithMixedFormats_ProcessesBoth"
 
+          - id: "TEST-005"
+            title: "The tool shall support source-specific test matching using filepart@testname pattern."
+            tests:
+              - "TraceMatrix_WithSourceSpecificTests_MatchesCorrectly"
+              - "TraceMatrix_WithSourceSpecificTests_DoesNotMatchOtherSources"
+
+          - id: "TEST-006"
+            title: "The tool shall perform case-insensitive matching of file parts in source-specific test names."
+            tests:
+              - "TraceMatrix_WithSourceSpecificTests_IsCaseInsensitive"
+
+          - id: "TEST-007"
+            title: "The tool shall support partial filename matching for source-specific tests."
+            tests:
+              - "TraceMatrix_WithSourceSpecificTests_MatchesPartialFilename"
+
+          - id: "TEST-008"
+            title: "The tool shall maintain backward compatibility with plain test names that aggregate from all sources."
+            tests:
+              - "TraceMatrix_WithPlainTestNames_MatchesAllSources"
+
+          - id: "TEST-009"
+            title: "The tool shall support mixing plain and source-specific test names in the same requirement."
+            tests:
+              - "TraceMatrix_WithMixedTestNames_MatchesAppropriately"
+
       - title: "Reporting"
         requirements:
           - id: "RPT-001"

src/DemaConsulting.ReqStream/TraceMatrix.cs

@@ -443,6 +443,9 @@ private void ProcessTestResultFile(string filePath, HashSet<string> requiredTest
             throw new FileNotFoundException($"Test result file not found: {filePath}", filePath);
         }
 
+        // Extract the base filename (without extension) for source matching
+        var fileBaseName = Path.GetFileNameWithoutExtension(filePath);
+
         // Read the file content
         var content = File.ReadAllText(filePath);
 
@@ -468,17 +471,18 @@ private void ProcessTestResultFile(string filePath, HashSet<string> requiredTest
         // Process each test result
         foreach (var result in testResults.Results)
         {
-            // Only process tests that are referenced in requirements
-            if (!requiredTests.Contains(result.Name))
+            // Check if any required test matches this result
+            var matchingTestName = FindMatchingTestName(requiredTests, result.Name, fileBaseName);
+            if (matchingTestName == null)
             {
                 continue;
             }
 
-            // Get or create the test result entry
-            if (!_testResults.TryGetValue(result.Name, out var entry))
+            // Get or create the test result entry using the full test name from requirements
+            if (!_testResults.TryGetValue(matchingTestName, out var entry))
             {
                 entry = new TestResultEntry();
-                _testResults[result.Name] = entry;
+                _testResults[matchingTestName] = entry;
             }
 
             // Update execution counts
@@ -490,4 +494,63 @@ private void ProcessTestResultFile(string filePath, HashSet<string> requiredTest
             }
         }
     }
+
+    /// <summary>
+    ///     Finds a matching test name from the required tests set.
+    ///     Supports both plain test names and source-specific test names with the pattern: [filepart@]testname.
+    /// </summary>
+    /// <param name="requiredTests">Set of test names from requirements.</param>
+    /// <param name="actualTestName">The actual test name from the test result file.</param>
+    /// <param name="fileBaseName">The base name of the test result file (without extension).</param>
+    /// <returns>The matching test name from requirements, or null if no match found.</returns>
+    private static string? FindMatchingTestName(HashSet<string> requiredTests, string actualTestName, string fileBaseName)
+    {
+        // First, try to find an exact match with source specifier: <filepart>@<testname>
+        // Check if any filepart from the base name matches
+        foreach (var requiredTest in requiredTests)
+        {
+            var (filePart, testName) = ParseTestName(requiredTest);
+
+            // If there's a file part, check if it matches and the test name matches
+            if (filePart != null && 
+                fileBaseName.Contains(filePart, StringComparison.OrdinalIgnoreCase) && 
+                testName == actualTestName)
+            {
+                return requiredTest;
+            }
+        }
+
+        // Second, try to find a plain test name match (no source specifier)
+        foreach (var requiredTest in requiredTests)
+        {
+            var (filePart, testName) = ParseTestName(requiredTest);
+
+            // If there's no file part and the test name matches
+            if (filePart == null && testName == actualTestName)
+            {
+                return requiredTest;
+            }
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    ///     Parses a test name to extract the optional file part and the actual test name.
+    ///     Format: [filepart@]testname
+    /// </summary>
+    /// <param name="testName">The test name from requirements.</param>
+    /// <returns>A tuple of (filePart, testName). filePart is null if not specified.</returns>
+    private static (string? filePart, string testName) ParseTestName(string testName)
+    {
+        var atIndex = testName.IndexOf('@');
+        if (atIndex > 0 && atIndex < testName.Length - 1)
+        {
+            var filePart = testName[..atIndex];
+            var actualTestName = testName[(atIndex + 1)..];
+            return (filePart, actualTestName);
+        }
+
+        return (null, testName);
+    }
 }