Added ref test

Author: delvedor

test/ref.json

@@ -0,0 +1,12 @@
+{
+  "definitions": {
+    "def": {
+      "type": "object",
+      "properties": {
+        "str": {
+          "type": "string"
+        }
+      }
+    }
+  }
+}

test/ref.test.js

@@ -0,0 +1,221 @@
+'use strict'
+
+const test = require('tap').test
+const build = require('..')
+
+test('ref internal - properties', (t) => {
+  t.plan(2)
+
+  const schema = {
+    title: 'object with $ref',
+    definitions: {
+      def: {
+        type: 'object',
+        properties: {
+          str: {
+            type: 'string'
+          }
+        }
+      }
+    },
+    type: 'object',
+    properties: {
+      obj: {
+        $ref: '#/definitions/def'
+      }
+    }
+  }
+
+  const object = {
+    obj: {
+      str: 'test'
+    }
+  }
+
+  const stringify = build(schema)
+  const output = stringify(object)
+
+  try {
+    JSON.parse(output)
+    t.pass()
+  } catch (e) {
+    t.fail()
+  }
+
+  t.equal('{"obj":{"str":"test"}}', output)
+})
+
+test('ref external - properties', (t) => {
+  t.plan(2)
+
+  const schema = {
+    title: 'object with $ref',
+    definitions: {
+      def: {
+        type: 'object',
+        properties: {
+          str: {
+            type: 'string'
+          }
+        }
+      }
+    },
+    type: 'object',
+    properties: {
+      obj: {
+        $ref: __dirname + '/ref.json#/definitions/def' // eslint-disable-line
+      }
+    }
+  }
+
+  const object = {
+    obj: {
+      str: 'test'
+    }
+  }
+
+  const stringify = build(schema)
+  const output = stringify(object)
+
+  try {
+    JSON.parse(output)
+    t.pass()
+  } catch (e) {
+    t.fail()
+  }
+
+  t.equal('{"obj":{"str":"test"}}', output)
+})
+
+test('ref internal - patternProperties', (t) => {
+  t.plan(2)
+
+  const schema = {
+    title: 'object with $ref',
+    definitions: {
+      def: {
+        type: 'object',
+        properties: {
+          str: {
+            type: 'string'
+          }
+        }
+      }
+    },
+    type: 'object',
+    properties: {},
+    patternProperties: {
+      obj: {
+        $ref: '#/definitions/def'
+      }
+    }
+  }
+
+  const object = {
+    obj: {
+      str: 'test'
+    }
+  }
+
+  const stringify = build(schema)
+  const output = stringify(object)
+
+  try {
+    JSON.parse(output)
+    t.pass()
+  } catch (e) {
+    t.fail()
+  }
+
+  t.equal('{"obj":{"str":"test"}}', output)
+})
+
+test('ref internal - additionalProperties', (t) => {
+  t.plan(2)
+
+  const schema = {
+    title: 'object with $ref',
+    definitions: {
+      def: {
+        type: 'object',
+        properties: {
+          str: {
+            type: 'string'
+          }
+        }
+      }
+    },
+    type: 'object',
+    properties: {},
+    additionalProperties: {
+      $ref: '#/definitions/def'
+    }
+  }
+
+  const object = {
+    obj: {
+      str: 'test'
+    }
+  }
+
+  const stringify = build(schema)
+  const output = stringify(object)
+
+  try {
+    JSON.parse(output)
+    t.pass()
+  } catch (e) {
+    t.fail()
+  }
+
+  t.equal('{"obj":{"str":"test"}}', output)
+})
+
+test('ref internal - pattern-additional Properties', (t) => {
+  t.plan(2)
+
+  const schema = {
+    title: 'object with $ref',
+    definitions: {
+      def: {
+        type: 'object',
+        properties: {
+          str: {
+            type: 'string'
+          }
+        }
+      }
+    },
+    type: 'object',
+    properties: {},
+    patternProperties: {
+      reg: {
+        $ref: '#/definitions/def'
+      }
+    },
+    additionalProperties: {
+      $ref: '#/definitions/def'
+    }
+  }
+
+  const object = {
+    reg: {
+      str: 'test'
+    },
+    obj: {
+      str: 'test'
+    }
+  }
+
+  const stringify = build(schema)
+  const output = stringify(object)
+
+  try {
+    JSON.parse(output)
+    t.pass()
+  } catch (e) {
+    t.fail()
+  }
+
+  t.equal('{"reg":{"str":"test"},"obj":{"str":"test"}}', output)
+})