Added test for text plugin

tests/plugins/plugin-text.test.js

@@ -0,0 +1,57 @@
+const root = '../../';
+
+jest.useFakeTimers();
+
+describe('text plugin', function(){
+
+	beforeEach(function(){
+		require(root + 'jspsych.js');
+		require(root + 'plugins/jspsych-text.js');
+	});
+
+	test('loads correctly', function(){
+		expect(typeof window.jsPsych.plugins['text']).not.toBe('undefined');
+	});
+
+	test('displays text', function(){
+		var trial = {
+			type: 'text',
+			text: 'Hello World!'
+		}
+
+		jsPsych.init({
+			timeline: [trial]
+		});
+
+		expect(jsPsych.getDisplayElement().innerHTML).toBe('Hello World!');
+	});
+
+	test('display should clear when continue key is pressed', function(){
+		var trial = {
+			type: 'text',
+			text: 'Testing',
+			cont_key: ['f']
+		};
+
+		var trial2 = {
+			type: 'text',
+			text: 'Second trial'
+		};
+
+		var timeline = [];
+		timeline.push(trial);
+		timeline.push(trial2);
+
+		jsPsych.init({
+			timeline: timeline
+		});
+
+		expect(jsPsych.getDisplayElement().innerHTML).toBe('Testing');
+
+		document.dispatchEvent(new KeyboardEvent('keydown', {keyCode: 70}));
+		document.dispatchEvent(new KeyboardEvent('keyup', {keyCode: 70}));
+
+		expect(jsPsych.getDisplayElement().innerHTML).toBe("");
+
+	});
+});