debt - add tests for SuggestModel#Context

src/vs/editor/contrib/suggest/common/suggestModel.ts

@@ -30,7 +30,7 @@ export interface ISuggestEvent {
 	auto: boolean;
 }
 
-class Context {
+export class Context {
 
 	lineNumber: number;
 	column: number;

src/vs/editor/contrib/suggest/test/common/suggestModel.test.ts

@@ -0,0 +1,59 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+import * as assert from 'assert';
+import {Model} from 'vs/editor/common/model/model';
+import {Context} from 'vs/editor/contrib/suggest/common/suggestModel';
+
+suite('SuggestModel', function () {
+
+	let model: Model;
+
+	setup(function () {
+		model = Model.createFromString('Das Pferd frisst keinen Gurkensalat - Philipp Reis 1861.\nWer hat\'s erfunden?');
+	});
+
+	teardown(function () {
+		model.dispose();
+	});
+
+	test('Context - shouldAutoTrigger', function () {
+
+		function assertAutoTrigger(offset: number, expected: boolean): void {
+			const pos = model.getPositionAt(offset);
+			const ctx = new Context(model, pos, false);
+			assert.equal(ctx.shouldAutoTrigger(), expected);
+		}
+
+		assertAutoTrigger(3, true); // end of word, Das|
+		assertAutoTrigger(4, false); // no word Das |
+		assertAutoTrigger(1, false); // middle of word D|as
+		assertAutoTrigger(55, false); // number, 1861|
+	});
+
+	test('Context - isDifferentContext', function () {
+
+		// different line
+		const ctx = new Context(model, { lineNumber: 1, column: 8 }, true); // Das Pfer|d
+		assert.equal(ctx.isDifferentContext(new Context(model, { lineNumber: 2, column: 1 }, true)), true);
+
+
+		function createEndContext(value: string) {
+			const model = Model.createFromString(value);
+			const ctx = new Context(model, model.getPositionAt(value.length), true); // Das Pfer|d
+			return ctx;
+		}
+
+		// got shorter -> redo
+		assert.equal(createEndContext('One Two').isDifferentContext(createEndContext('One Tw')), true);
+
+		// got longer inside word -> keep
+		assert.equal(createEndContext('One Tw').isDifferentContext(createEndContext('One Two')), false);
+
+		// got longer new word -> redo
+		assert.equal(createEndContext('One Two').isDifferentContext(createEndContext('One Two ')), true);
+	});
+});