add an initial integration test

It at least prevents this extension from being entirely corrupted.

.gitignore

@@ -1 +1,2 @@
+.vscode-test
 node_modules

.travis.yml

@@ -1,7 +1,11 @@
-git:
-  depth: 1
 branches:
   except: /^v\d/
 language: node_js
 node_js: node
-before_install: npm install --global npm@next
+matrix:
+  include:
+  - script: eval xvfb-run `jq --raw-output .scripts.test < package.json`
+  - os: osx
+    osx_image: xcode9.3beta
+branches:
+  except: /^v\d/

.vscodeignore

@@ -1,9 +1,11 @@
-.editorconfig
-.gitignore
-.vscode/**
-*.css
-*.png
-*.scss
-*.less
-media/*.ai
-test
+.editorconfig
+.gitignore
+.vscode
+.vscode-test
+*.css
+*.less
+*.png
+*.scss
+*.yml
+media/*.ai
+test

package.json

@@ -79,7 +79,8 @@
 		]
 	},
 	"scripts": {
-		"test": "eslint --fix --format=codeframe index.js server.js"
+		"pretest": "eslint --fix --format=codeframe .",
+		"test": "node node_modules/vscode/bin/test"
 	},
 	"dependencies": {
 		"stylelint-vscode": "^6.1.0",
@@ -89,6 +90,7 @@
 	"devDependencies": {
 		"@shinnn/eslint-config-node": "^5.0.0",
 		"eslint": "^4.18.1",
+		"tape": "^4.9.0",
 		"vscode": "^1.1.10"
 	},
 	"eslintConfig": {

test/index.js

@@ -0,0 +1,42 @@
+/* eslint-disable node/no-unpublished-require */
+'use strict';
+
+const test = require('tape');
+const {extensions, workspace, window} = require('vscode');
+
+const run = () => test('vscode-stylelint', async t => {
+	const vscodeStylelint = extensions.getExtension('shinnn.stylelint');
+
+	const plaintextDocument = await workspace.openTextDocument({
+		content: 'Hello',
+		language: 'plaintext'
+	});
+
+	await window.showTextDocument(plaintextDocument);
+
+	t.equal(
+		vscodeStylelint.isActive,
+		false,
+		'should not be activated when the open file is not CSS.'
+	);
+
+	const cssDocument = await workspace.openTextDocument({
+		content: '}',
+		language: 'css'
+	});
+
+	await window.showTextDocument(cssDocument);
+
+	t.equal(
+		vscodeStylelint.isActive,
+		true,
+		'should be activated when the open file is CSS.'
+	);
+
+	t.end();
+});
+
+exports.run = (root, done) => {
+	test.onFinish(done);
+	run();
+};