Added checks to make sure the specified track exists

Added precondition checks to validate input files and paths to return more informative error messages as per #2

node_modules/@jest/core/build/runGlobalHook.d.ts

@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+import { Config } from '@jest/types';
+declare const _default: ({ allTests, globalConfig, moduleName, }: {
+    allTests: import("jest-runner/build/types").Test[];
+    globalConfig: Config.GlobalConfig;
+    moduleName: "globalSetup" | "globalTeardown";
+}) => Promise<void>;
+export default _default;
+//# sourceMappingURL=runGlobalHook.d.ts.map