Test whether the generated schemas are valid json schemas.

Author: domoritz

package.json

@@ -36,12 +36,14 @@
     "yargs": "^6.4.0"
   },
   "devDependencies": {
+    "@types/ajv": "0.0.4",
     "@types/assertion-error": "^1.0.30",
     "@types/chai": "^3.4.34",
     "@types/glob": "^5.0.30",
     "@types/json-stable-stringify": "^1.0.29",
     "@types/mocha": "^2.2.33",
     "@types/node": "^6.0.51",
+    "ajv": "^4.9.0",
     "chai": "^3.5.0",
     "mocha": "^3.1.2",
     "source-map-support": "^0.4.6",

test/schema.test.ts

@@ -3,12 +3,15 @@ import {CompilerOptions} from "typescript";
 import * as TJS from "../typescript-json-schema";
 import {readFileSync} from "fs";
 import {resolve} from "path";
+import * as Ajv from "ajv";
+
+const ajv = new Ajv();
 
 const base = "test/programs/";
 
 export function assertSchema(group: string, name: string, type: string, settings?: any, compilerOptions?: CompilerOptions) {
     it(group + " should create correct schema", function() {
-        if(!settings) {
+        if (!settings) {
             settings = TJS.getDefaultArgs();
             settings.generateRequired = true;
         }
@@ -19,7 +22,11 @@ export function assertSchema(group: string, name: string, type: string, settings
         const expected = JSON.parse(file);
 
         assert.isObject(actual);
-        assert.deepEqual(actual, expected);
+        assert.deepEqual(actual, expected, "The schema is not as expected");
+
+        // test against the meta schema
+        ajv.validateSchema(actual);
+        assert.equal(ajv.errors, null, "The schema is not valid");
     });
 }