feat(methods): add propertyOfType assertion

Author: Walker Leite

src/methods/index.js

@@ -1 +1,2 @@
 export * from './have-many';
+export * from './property-of-type';

src/methods/index.spec.js

@@ -4,4 +4,8 @@ describe('methods', () => {
   it('export haveMany', () => {
     expect(methods).toHaveProperty('haveMany');
   });
+
+  it('export propertyOfType', () => {
+    expect(methods).toHaveProperty('propertyOfType');
+  });
 });

src/methods/property-of-type.js

@@ -0,0 +1,3 @@
+export function propertyOfType() {
+
+}

src/methods/property-of-type.spec.js

@@ -0,0 +1,28 @@
+import chai from 'chai';
+import loopbackChai from '../index';
+
+describe('propertyOfType assertion', () => {
+  // const perfecMock = {
+  //   properties: {
+  //     foo: {
+  //       type: 'string',
+  //     },
+  //   },
+  // };
+
+  chai.use(loopbackChai);
+
+  function propertyOfType(subject, ...args) {
+    return () => chai
+      .expect(subject)
+      .to
+      .propertyOfType(...args);
+  }
+
+  it('throws if wrong type', () => {
+    const subj = {
+      properties: { foo: { type: 'INVALID' } },
+    };
+    expect(propertyOfType(subj)).toThrow();
+  });
+});