Add shallow component tests

src/components/Callbacks/index.ts

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+export * from './Callback';
+export * from './CallbackTitle';
+export * from './CallbacksList';

src/components/__tests__/Callbacks.test.tsx

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+/* tslint:disable:no-implicit-dependencies */
+
+import { shallow } from 'enzyme';
+import * as React from 'react';
+
+import { OpenAPIParser } from '../../services';
+import { CallbackModel } from '../../services/models/Callback';
+import { CallbackView, CallbacksList, CallbackTitle } from '../Callbacks';
+import { RedocNormalizedOptions } from '../../services/RedocNormalizedOptions';
+import * as simpleCallbackFixture from './fixtures/simple-callback.json';
+
+const options = new RedocNormalizedOptions({});
+describe('Components', () => {
+  describe('Callbacks', () => {
+    it('should correctly render CallbackView', () => {
+      const parser = new OpenAPIParser(simpleCallbackFixture, undefined, options);
+      const callback = new CallbackModel(
+        parser,
+        'Test.Callback',
+        { $ref: '#/components/callbacks/Test' },
+        options,
+      );
+      const callbackViewElement = shallow(
+        <CallbackView key={callback.name} callback={callback} />,
+      ).getElement();
+      expect(callbackViewElement.props).toBeDefined();
+      expect(callbackViewElement.props.children).toBeDefined();
+      expect(callbackViewElement.props.children.length).toBeGreaterThan(0);
+    });
+
+    it('should correctly render CallbackTitle', () => {
+      const callbackTitleViewElement = shallow(
+        <CallbackTitle name={'Test'} className={'.test'} onClick={undefined} />,
+      ).getElement();
+      expect(callbackTitleViewElement.props).toBeDefined();
+      expect(callbackTitleViewElement.props.className).toEqual('.test');
+      expect(callbackTitleViewElement.props.onClick).toBeUndefined();
+    });
+
+    it('should correctly render CallbacksList', () => {
+      const parser = new OpenAPIParser(simpleCallbackFixture, undefined, options);
+      const callback = new CallbackModel(
+        parser,
+        'Test.Callback',
+        { $ref: '#/components/callbacks/Test' },
+        options,
+      );
+      const callbacksListViewElement = shallow(
+        <CallbacksList callbacks={[callback]} />,
+      ).getElement();
+      expect(callbacksListViewElement.props).toBeDefined();
+      expect(callbacksListViewElement.props.children).toBeDefined();
+      expect(callbacksListViewElement.props.children.length).toBeGreaterThan(0);
+    });
+  });
+});

src/components/__tests__/fixtures/simple-callback.json

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+{
+    "openapi": "3.0.0",
+    "info": {
+      "version": "1.0",
+      "title": "Foo"
+    },
+    "components": {
+      "callbacks": {
+        "Test": {
+            "post": {
+              "operationId": "testCallback",
+              "description": "Test callback.",
+              "requestBody": {
+                "content": {
+                  "application/json": {
+                    "schema": {
+                      "title": "TestTitle",
+                      "type": "object",
+                      "description": "Test description",
+                      "properties": {
+                        "type": {
+                          "type": "string",
+                          "description": "The type of response.",
+                          "enum": [
+                            "TestResponse.Complete"
+                          ]
+                        },
+                        "status": {
+                          "type": "string",
+                          "enum": [
+                            "FAILURE",
+                            "SUCCESS"
+                          ]
+                        }
+                      },
+                      "required": [
+                        "status"
+                      ]
+                    }
+                  }
+                }
+              },
+              "parameters": [
+                {
+                  "name": "X-Test-Header",
+                  "in": "header",
+                  "required": true,
+                  "example": "1",
+                  "description": "This is a test header parameter",
+                  "schema": {
+                    "type": "string"
+                  }
+                }
+              ],
+              "responses": {
+                "204": {
+                  "description": "Test response."
+                }
+              }
+            }
+          }
+      }
+    }
+  }