Add test to the MapParser class in OTA_analyzer.

Add unit test to the MapParser class in map_parser.js. Please refer to
this CL for the original class definition:

https://android-review.googlesource.com/c/platform/development/+/1760909

Test: npm run test:unit
Change-Id: I2d640e9c5e27c0a012e32b4be09348034b67b235

tools/ota_analysis/jest.config.js

@@ -1,6 +1,14 @@
+const defaults = require('jest-config')
+
 module.exports = {
   preset: '@vue/cli-plugin-unit-jest',
   transform: {
     '^.+\\.vue$': 'vue-jest'
+  },
+  globals: {
+    ...defaults.globals,
+    crypto: require('crypto'),
+    TextEncoder: require('util').TextEncoder,
+    TextDecoder: require('util').TextDecoder,
   }
-}
+}