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-haste-map/build/persistence.js

@@ -0,0 +1,19 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.default = void 0;
+// Try to load SQLite persistence, but fall back to file persistence when SQLite
+let chosenModule;
+
+try {
+  require.resolve('better-sqlite3');
+
+  chosenModule = require('./persistence/sqlite').default;
+} catch (_unused) {
+  chosenModule = require('./persistence/file').default;
+}
+
+var _default = chosenModule;
+exports.default = _default;