Create a file level group for tests

Author: seg4lt

src/zigTestRunnerProvider.ts

@@ -84,19 +84,28 @@ export default class ZigTestRunnerProvider {
         const matches = Array.from(textDocument.getText().matchAll(regex));
         this.deleteTestForAFile(textDocument.uri);
 
+        const fileName = path.basename(textDocument.uri.fsPath);
+        const fileTestItem = this.testController.createTestItem(
+            `file:${textDocument.uri.fsPath}`,
+            fileName,
+            textDocument.uri,
+        );
+
         for (const match of matches) {
             const testDesc = match[1];
             const position = textDocument.positionAt(match.index);
             const range = new vscode.Range(position, position.translate(0, match[0].length));
-            const fileName = path.basename(textDocument.uri.fsPath);
 
             const testItem = this.testController.createTestItem(
-                `${fileName}.test.${testDesc}`, // Test id needs to be unique, so adding file name prefix
-                `${fileName} - ${testDesc}`,
+                `${fileName}.test.${testDesc}`,
+                testDesc,
                 textDocument.uri,
             );
             testItem.range = range;
-            this.testController.items.add(testItem);
+            fileTestItem.children.add(testItem);
+        }
+        if (fileTestItem.children.size > 0) {
+            this.testController.items.add(fileTestItem);
         }
     }