Implement a test for Colorpicker widget

api/js/etemplate/Et2Colorpicker/test/Et2Colorpicker.test.ts

@@ -0,0 +1,38 @@
+/**
+ * Test file for Etemplate webComponent base widget Et2Colorpicker
+ */
+import {assert, fixture} from '@open-wc/testing';
+import {Et2Colorpicker} from "../Et2Colorpicker";
+import {html} from "lit-element";
+
+
+describe("Colorpicker widget", () =>
+{
+	// Reference to component under test
+	let element : Et2Colorpicker;
+
+	// Setup run before each test
+	beforeEach(async() =>
+	{
+		// Create an element to test with, and wait until it's ready
+		element = await fixture<Et2Colorpicker>(html`
+            <et2-colorpicker></et2-colorpicker>
+		`);
+	});
+
+	it('is defined', () =>
+	{
+		assert.instanceOf(element, Et2Colorpicker);
+	});
+
+	it('clearing value', () =>
+	{
+		// set a value
+		element.set_value("11111");
+		// trigger the clear button
+		element.__getClearButtonNode().dispatchEvent(new MouseEvent('click'));
+
+		assert.equal(element.getValue(), "");
+	});
+
+});