add basic tests

test/custom-operations/apply-unique-ids.spec.ts

@@ -0,0 +1,30 @@
+import { applyUniqueIds } from '../../src/custom-operations';
+
+describe('applying unique ids', function() {
+  it('should not do anything for v2 inputs', async function() {
+    const input = {asyncapi: '2.0.0'};
+    const output = {...input};
+    applyUniqueIds(output);
+    expect(input).toEqual(output);
+  });
+  describe('for v3', function() {
+    it('should work with no channels input', async function() {
+      const input = {asyncapi: '3.0.0'};
+      const output = {...input};
+      applyUniqueIds(output);
+      expect(input).toEqual(output);
+    });
+    it('should set unique id when input has channels', async function() {
+      const input = {asyncapi: '3.0.0', channels: {testChannel: {}}};
+      const output = {...input, channels: {testChannel: {'x-parser-unique-object-id': 'testChannel'}}};
+      applyUniqueIds(input);
+      expect(input).toEqual(output);
+    });
+    it('should set unique id when input has messages in channels', async function() {
+      const input = {asyncapi: '3.0.0', channels: {testChannel: {messages: {testMessage: {}}}}};
+      const output = {...input, channels: {testChannel: {'x-parser-unique-object-id': 'testChannel', messages: {testMessage: {'x-parser-unique-object-id': 'testMessage'}}}}};
+      applyUniqueIds(input);
+      expect(input).toEqual(output);
+    });
+  });
+});