chore: import upstream snapshot with attribution

tools/test/run-test-file.ts

@@ -0,0 +1,27 @@
+import { spawn } from "node:child_process";
+import fs from "node:fs";
+import path from "node:path";
+import * as find from "empathic/find";
+
+const currentFile = process.argv[2];
+const currentDirectory = path.dirname(currentFile);
+
+const packageJsonPath = find.file("package.json", { cwd: currentDirectory });
+
+if (!packageJsonPath) {
+	console.error("No package.json found.");
+	process.exit(1);
+}
+
+const packageJsonContent = fs.readFileSync(packageJsonPath, "utf8");
+const packageJson = JSON.parse(packageJsonContent);
+const packageName = packageJson.name;
+
+const command = `pnpm`;
+const args = ["test", "-F", packageName, "--", currentFile];
+
+const testProcess = spawn(command, args, { stdio: "inherit" });
+
+testProcess.on("close", (code) => {
+	process.exit(code ?? 1);
+});