diff --git a/index.js b/index.js
index cabd718..4301faf 100644
--- a/index.js
+++ b/index.js
@@ -3,7 +3,7 @@
 module.exports = function (cb) {
 	var ret = '';
 
-	if (!process.stdin.isTTY) {
+	if (process.stdin.isTTY) {
 		cb('');
 		return;
 	}
@@ -23,7 +23,7 @@ module.exports.buffer = function (cb) {
 	var ret = [];
 	var len = 0;
 
-	if (!process.stdin.isTTY) {
+	if (process.stdin.isTTY) {
 		cb(new Buffer(''));
 		return;
 	}
diff --git a/package.json b/package.json
index 2c15742..7d15fdd 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "node": ">=0.10.0"
   },
   "scripts": {
-    "test": "node test.js"
+    "test": "node test.js && echo unicorns | node test2.js"
   },
   "files": [
     "index.js"
diff --git a/test.js b/test.js
index ee3d5ae..4f65584 100644
--- a/test.js
+++ b/test.js
@@ -5,6 +5,7 @@ var stdin = require('./');
 
 test('get stdin', function (t) {
 	t.plan(1);
+	process.stdin.isTTY = false;
 
 	stdin(function (data) {
 		t.assert(data.trim() === 'unicorns');
@@ -16,6 +17,7 @@ test('get stdin', function (t) {
 
 test('get stdin as a buffer', function (t) {
 	t.plan(2);
+	process.stdin.isTTY = false;
 
 	stdin.buffer(function (data) {
 		t.assert(bufferEqual(data, new Buffer('unicorns')));
@@ -27,27 +29,20 @@ test('get stdin as a buffer', function (t) {
 });
 
 test('get empty string when no stdin', function (t) {
-	var _ = process.stdin.isTTY;
-	process.stdin.isTTY = false;
-
 	t.plan(1);
+	process.stdin.isTTY = true;
 
 	stdin(function (data) {
 		t.assert(data === '');
 	});
-
-	process.stdin.isTTY = _;
 });
 
 test('get empty buffer when no stdin', function (t) {
-	var _ = process.stdin.isTTY;
-	process.stdin.isTTY = false;
-
 	t.plan(1);
+	process.stdin.isTTY = true;
 
 	stdin.buffer(function (data) {
 		t.assert(bufferEqual(data, new Buffer('')));
 	});
-
-	process.stdin.isTTY = _;
 });
+
diff --git a/test2.js b/test2.js
new file mode 100644
index 0000000..c6b63d3
--- /dev/null
+++ b/test2.js
@@ -0,0 +1,6 @@
+'use strict';
+var stdin = require('./');
+
+stdin(function (data) {
+	process.exit(data ? 0 : 1);
+});