yarn build

dist/index.js

@@ -1015,6 +1015,11 @@ const ResultsCheck = {
                     return;
                 core.info(`Processing file ${filepath}...`);
                 try {
+                    const content = fs.readFileSync(path_1.default.join(artifactsPath, filepath), 'utf8');
+                    if (!content.includes('<test-results') && !content.includes('<test-run')) {
+                        // noinspection ExceptionCaughtLocallyJS
+                        throw new Error('File does not appear to be a NUnit XML file');
+                    }
                     const fileData = yield results_parser_1.default.parseResults(path_1.default.join(artifactsPath, filepath));
                     core.info(fileData.summary);
                     runs.push(fileData);