fixed error messages of JSON parsing is failed

__test__/index.spec.js

@@ -0,0 +1,26 @@
+var ramlToSwagger = require('../src');
+
+describe('converting', () => {
+  it('should fail fast if json is wrong', () => {
+    const testJson = '{"some": "json" "that-is": "wrong"}';
+    const testData = {
+      title: 'test',
+      version: '2.0.0',
+      securitySchemes: [],
+      resources: [],
+      schemas: [
+        {
+          TestSchema: testJson
+        }
+      ]
+    };
+
+    expect(() => {
+      ramlToSwagger.convert(testData);
+    }).toThrowError([
+      'Unexpected string in JSON at position 16',
+      '1: {"some": "json" "that-is": "wrong"}',
+      '------------------^'
+    ].join('\n'));
+  });
+});

package.json

@@ -3,6 +3,9 @@
   "version": "1.1.0",
   "description": "Script for converting RAML format into Swagger 2.0",
   "main": "src/index.js",
+  "scripts": {
+    "test": "jest"
+  },
   "repository": {
     "type": "git",
     "url": "git://github.com/APIs-guru/raml-to-swagger.git"
@@ -27,5 +30,9 @@
     "jsonpath": "^0.2.5",
     "lodash": "^4.1.0",
     "urijs": "^1.17.0"
+  },
+  "devDependencies": {
+    "better-error-message-for-json-parse": "^0.1.6",
+    "jest": "^22.4.2"
   }
 }

src/index.js

@@ -6,6 +6,7 @@ var _ = require('lodash');
 var jsonCompat = require('json-schema-compatibility');
 var HttpStatus = require('http-status-codes').getStatusText;
 var jp = require('jsonpath');
+var bemfjp = require('better-error-message-for-json-parse');
 
 exports.convert = function (raml) {
   //FIXME:
@@ -344,18 +345,13 @@ function parseBody(ramlBody, srMethod) {
   });
 }
 
-function convertSchema(schema) {
-  if (_.isUndefined(schema))
+function convertSchema(rawSchema) {
+  if (_.isUndefined(rawSchema))
     return;
 
-  assert(_.isString(schema));
+  assert(_.isString(rawSchema));
 
-  try {
-    var schema = JSON.parse(schema);
-  }
-  catch (e) {
-    return undefined;
-  }
+  var schema = bemfjp.safeJsonParse(rawSchema);
 
   delete schema.id;
   delete schema.$schema;