add a test case for self ref

Author: stevehu

src/test/java/com/networknt/schema/SelfRefTest.java

@@ -0,0 +1,15 @@
+package com.networknt.schema;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.junit.Test;
+
+/**
+ * Created by stevehu on 2016-12-20.
+ */
+public class SelfRefTest extends BaseJsonSchemaValidatorTest {
+    @Test
+    public void testSelfRef() throws Exception {
+        JsonNode node = getJsonNodeFromClasspath("selfref.json");
+        System.out.println("node = " + node);
+    }
+}

src/test/resources/selfref.json

@@ -0,0 +1,31 @@
+{
+  "type": "object",
+  "properties": {
+    "name": {
+      "type": "string"
+    },
+    "tree": {
+      "$ref": "#/definitions/tree"
+    }
+  },
+  "definitions": {
+    "tree": {
+      "type": "object",
+      "properties": {
+        "value": {
+          "type": "string"
+        },
+        "branches": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/tree"
+          },
+          "minItems": 1
+        }
+      },
+      "required": [
+        "value"
+      ]
+    }
+  }
+}