Adding Jest tests for @wire (trailheadapps#62)

force-app/main/default/lwc/apexImperativeMethod/__tests__/apexImperativeMethod.test.js

@@ -2,7 +2,7 @@ import { createElement } from 'lwc';
 import ApexImperativeMethod from 'c/apexImperativeMethod';
 import getContactList from '@salesforce/apex/ContactController.getContactList';
 
-// Mocking impertive Apex method call
+// Mocking imperative Apex method call
 jest.mock(
     '@salesforce/apex/ContactController.getContactList',
     () => {

force-app/main/default/lwc/apexImperativeMethodWithParams/__tests__/apexImperativeMethodWithParams.test.js

@@ -2,7 +2,7 @@ import { createElement } from 'lwc';
 import ApexImperativeMethodWithParams from 'c/apexImperativeMethodWithParams';
 import findContacts from '@salesforce/apex/ContactController.findContacts';
 
-// Mocking impertive Apex method call
+// Mocking imperative Apex method call
 jest.mock(
     '@salesforce/apex/ContactController.findContacts',
     () => {

force-app/main/default/lwc/wireCurrentPageReference/__tests__/data/CurrentPageReference.json

@@ -0,0 +1,7 @@
+{
+    "type": "standard__navItemPage",
+    "attributes": {
+        "apiName": "Wire"
+    },
+    "state": {}
+}

force-app/main/default/lwc/wireCurrentPageReference/__tests__/wireCurrentPageReference.test.js

@@ -0,0 +1,39 @@
+import { createElement } from 'lwc';
+import WireCurrentPageReference from 'c/wireCurrentPageReference';
+import { CurrentPageReference } from 'lightning/navigation';
+import { registerTestWireAdapter } from '@salesforce/lwc-jest';
+
+const mockCurrentPageReference = require('./data/CurrentPageReference.json');
+
+// Register as an standard test wire adapter. Some tests verify the provisioned values trigger desired behavior.
+const currentPageReferenceAdapter = registerTestWireAdapter(
+    CurrentPageReference
+);
+
+describe('c-wire-current-page-reference', () => {
+    afterEach(() => {
+        // The jsdom instance is shared across test cases in a single file so reset the DOM
+        while (document.body.firstChild) {
+            document.body.removeChild(document.body.firstChild);
+        }
+    });
+
+    it('renders the current page reference as <pre> tag', () => {
+        // Create element
+        const element = createElement('c-wire-current-page-reference', {
+            is: WireCurrentPageReference
+        });
+        document.body.appendChild(element);
+
+        const preEl = element.shadowRoot.querySelector('pre');
+        expect(preEl).not.toBeNull();
+
+        currentPageReferenceAdapter.emit(mockCurrentPageReference);
+
+        return Promise.resolve().then(() => {
+            expect(preEl.textContent).toBe(
+                JSON.stringify(mockCurrentPageReference, null, 2)
+            );
+        });
+    });
+});