Add tests for type comparators

src/utilities/__tests__/typeComparators-test.js

@@ -0,0 +1,158 @@
+/**
+ *  Copyright (c) 2015, Facebook, Inc.
+ *  All rights reserved.
+ *
+ *  This source code is licensed under the BSD-style license found in the
+ *  LICENSE file in the root directory of this source tree. An additional grant
+ *  of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+import { describe, it } from 'mocha';
+import { expect } from 'chai';
+import {
+  GraphQLSchema,
+  GraphQLString,
+  GraphQLInt,
+  GraphQLFloat,
+  GraphQLList,
+  GraphQLNonNull,
+  GraphQLObjectType,
+  GraphQLInterfaceType,
+  GraphQLUnionType,
+} from '../../type';
+import { isEqualType, isTypeSubTypeOf } from '../typeComparators';
+
+
+describe('typeComparators', () => {
+
+  describe('isEqualType', () => {
+
+    it('same reference are equal', () => {
+      expect(isEqualType(GraphQLString, GraphQLString)).to.equal(true);
+    });
+
+    it('int and float are not equal', () => {
+      expect(isEqualType(GraphQLInt, GraphQLFloat)).to.equal(false);
+    });
+
+    it('lists of same type are equal', () => {
+      expect(
+        isEqualType(new GraphQLList(GraphQLInt), new GraphQLList(GraphQLInt))
+      ).to.equal(true);
+    });
+
+    it('lists is not equal to item', () => {
+      expect(
+        isEqualType(new GraphQLList(GraphQLInt), GraphQLInt)
+      ).to.equal(false);
+    });
+
+    it('non-null of same type are equal', () => {
+      expect(
+        isEqualType(
+          new GraphQLNonNull(GraphQLInt),
+          new GraphQLNonNull(GraphQLInt)
+        )
+      ).to.equal(true);
+    });
+
+    it('non-null is not equal to nullable', () => {
+      expect(
+        isEqualType(new GraphQLNonNull(GraphQLInt), GraphQLInt)
+      ).to.equal(false);
+    });
+
+  });
+
+  describe('isTypeSubTypeOf', () => {
+
+    function testSchema(fields) {
+      return new GraphQLSchema({
+        query: new GraphQLObjectType({
+          name: 'Query',
+          fields
+        })
+      });
+    }
+
+    it('same reference is subtype', () => {
+      const schema = testSchema({ field: { type: GraphQLString } });
+      expect(
+        isTypeSubTypeOf(schema, GraphQLString, GraphQLString)
+      ).to.equal(true);
+    });
+
+    it('int is not subtype of float', () => {
+      const schema = testSchema({ field: { type: GraphQLString } });
+      expect(
+        isTypeSubTypeOf(schema, GraphQLInt, GraphQLFloat)
+      ).to.equal(false);
+    });
+
+    it('non-null is subtype of nullable', () => {
+      const schema = testSchema({ field: { type: GraphQLString } });
+      expect(
+        isTypeSubTypeOf(schema, new GraphQLNonNull(GraphQLInt), GraphQLInt)
+      ).to.equal(true);
+    });
+
+    it('nullable is not subtype of non-null', () => {
+      const schema = testSchema({ field: { type: GraphQLString } });
+      expect(
+        isTypeSubTypeOf(schema, GraphQLInt, new GraphQLNonNull(GraphQLInt))
+      ).to.equal(false);
+    });
+
+    it('item is not subtype of list', () => {
+      const schema = testSchema({ field: { type: GraphQLString } });
+      expect(
+        isTypeSubTypeOf(schema, GraphQLInt, new GraphQLList(GraphQLInt))
+      ).to.equal(false);
+    });
+
+    it('list is not subtype of item', () => {
+      const schema = testSchema({ field: { type: GraphQLString } });
+      expect(
+        isTypeSubTypeOf(schema, new GraphQLList(GraphQLInt), GraphQLInt)
+      ).to.equal(false);
+    });
+
+    it('member is subtype of union', () => {
+      const member = new GraphQLObjectType({
+        name: 'Object',
+        isTypeOf: () => true,
+        fields: {
+          field: { type: GraphQLString }
+        }
+      });
+      const union = new GraphQLUnionType({ name: 'Union', types: [ member ] });
+      const schema = testSchema({ field: { type: union } });
+      expect(
+        isTypeSubTypeOf(schema, member, union)
+      ).to.equal(true);
+    });
+
+    it('implementation is subtype of interface', () => {
+      const iface = new GraphQLInterfaceType({
+        name: 'Interface',
+        fields: {
+          field: { type: GraphQLString }
+        }
+      });
+      const impl = new GraphQLObjectType({
+        name: 'Object',
+        isTypeOf: () => true,
+        interfaces: [ iface ],
+        fields: {
+          field: { type: GraphQLString }
+        }
+      });
+      const schema = testSchema({ field: { type: impl } });
+      expect(
+        isTypeSubTypeOf(schema, impl, iface)
+      ).to.equal(true);
+    });
+
+  });
+
+});