Create and remove directory programmatically

Windows PowerShell doesn’t support `&&` operator.

appveyor.yml

@@ -15,5 +15,5 @@ install:
 build: off
 
 test_script:
-  - ps: 'npm test # PowerShell'
-  - cmd: npm test
+  - ps: 'node test\test.js # PowerShell'
+  - cmd: node test\test.js

package.json

@@ -17,7 +17,7 @@
   },
   "scripts": {
     "postinstall": "node lib/install.js",
-    "test": "mkdir test/tmp && node test/test.js && rm -rf test/tmp"
+    "test": "node test/test.js"
   },
   "files": [
     "cli.js",
@@ -40,6 +40,8 @@
   "devDependencies": {
     "ava": "^0.0.4",
     "bin-check": "^1.0.0",
-    "compare-size": "^1.0.1"
+    "compare-size": "^1.0.1",
+    "mkdirp": "^0.5.0",
+    "rimraf": "^2.2.8"
   }
 }

test/test.js

@@ -3,7 +3,9 @@
 var binCheck = require('bin-check');
 var compareSize = require('compare-size');
 var execFile = require('child_process').execFile;
+var mkdir = require('mkdirp');
 var path = require('path');
+var rm = require('rimraf');
 var test = require('ava');
 var tmp = path.join(__dirname, 'tmp');
 
@@ -17,7 +19,7 @@ test('return path to binary and verify that it is working', function (t) {
 });
 
 test('minify a JPG', function (t) {
-	t.plan(3);
+	t.plan(5);
 
 	var src = path.join(__dirname, 'fixtures/test.jpg');
 	var dest = path.join(tmp, 'test.jpg');
@@ -28,12 +30,20 @@ test('minify a JPG', function (t) {
 		dest
 	];
 
-	execFile(require('../').path, args, function (err) {
+	mkdir(tmp, function (err) {
 		t.assert(!err, err);
 
-		compareSize(src, dest, function (err, res) {
+		execFile(require('../').path, args, function (err) {
 			t.assert(!err, err);
-			t.assert(res[dest] < res[src]);
+
+			compareSize(src, dest, function (err, res) {
+				t.assert(!err, err);
+				t.assert(res[dest] < res[src]);
+
+				rm(tmp, function (err) {
+					t.assert(!err, err);
+				});
+			});
 		});
 	});
 });