Handle invalid json

- fix style

backend/src/spec/JsonAstParser.spec.ts

@@ -1,28 +1,28 @@
-import 'mocha'
-
 import { expect } from 'chai'
 import { parseJson } from '../JsonAstParser'
+import 'mocha'
+
 const dotProp = require('dot-prop')
 
 describe('access JSON values via dot property paths', () => {
   it('object with literal', () => {
-    let data = {
+    const data = {
       foo: 4,
     }
 
-    let result = parseJson(JSON.stringify(data, undefined, 2))
+    const result = parseJson(JSON.stringify(data, undefined, 2))
     expect(result[0].path).to.eq('foo')
     expect(result[0].line).to.eq(2)
   })
 
   it('nested object', () => {
-    let data = {
+    const data = {
       foo: {
-        bar: 4
+        bar: 4,
       },
     }
 
-    let result = parseJson(JSON.stringify(data, undefined, 2))
+    const result = parseJson(JSON.stringify(data, undefined, 2))
     expect(result[0].path).to.eq('foo.bar')
     expect(result[0].line).to.eq(3)
     expect(dotProp.get(data, result[0].path)).to.eq(4)
@@ -30,7 +30,7 @@ describe('access JSON values via dot property paths', () => {
   })
 
   it('array path', () => {
-    let data = {
+    const data = {
       foo: [
         1,
         2,
@@ -38,11 +38,17 @@ describe('access JSON values via dot property paths', () => {
       ],
     }
 
-    let result = parseJson(JSON.stringify(data, undefined, 2))
+    const result = parseJson(JSON.stringify(data, undefined, 2))
     expect(result.length).to.eq(3)
 
     expect(result[2].path).to.eq('foo.2')
     expect(result[2].line).to.eq(5)
     expect(dotProp.get(data, result[2].path)).to.eq(3)
   })
+
+  it('should fail parsing invalid json', () => {
+    expect(() => {
+      const result = parseJson("BLE2MQTT-8C48")
+    }).to.throw()
+  })
 })