diff --git a/.gitignore b/.gitignore
index 029efd56..2fb4e7e6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,4 @@ Makefile.gyp
 example/*.log
 docs/
 npm-debug.log
+/.idea/
diff --git a/test/test.js b/test/test.js
index 043906f6..2f1c0fef 100644
--- a/test/test.js
+++ b/test/test.js
@@ -378,7 +378,7 @@ describe('xterm.js', function() {
 
   describe('unicode - surrogates', function() {
     it('2 characters per cell', function () {
-      var high = '\uD800';
+      var high = String.fromCharCode(0xD800);
       for (var i=0xDC00; i<=0xDCFF; ++i) {
         xterm.write(high + String.fromCharCode(i));
         var tchar = xterm.lines[0][0];
@@ -390,7 +390,7 @@ describe('xterm.js', function() {
       }
     });
     it('2 characters at last cell', function() {
-      var high = '\uD800';
+      var high = String.fromCharCode(0xD800);
       for (var i=0xDC00; i<=0xDCFF; ++i) {
         xterm.x = xterm.cols - 1;
         xterm.write(high + String.fromCharCode(i));
@@ -401,7 +401,7 @@ describe('xterm.js', function() {
       }
     });
     it('2 characters per cell over line end with autowrap', function() {
-      var high = '\uD800';
+      var high = String.fromCharCode(0xD800);
       for (var i=0xDC00; i<=0xDCFF; ++i) {
         xterm.x = xterm.cols - 1;
         xterm.wraparoundMode = true;
@@ -414,7 +414,7 @@ describe('xterm.js', function() {
       }
     });
     it('2 characters per cell over line end without autowrap', function() {
-      var high = '\uD800';
+      var high = String.fromCharCode(0xD800);
       for (var i=0xDC00; i<=0xDCFF; ++i) {
         xterm.x = xterm.cols - 1;
         xterm.wraparoundMode = false;
@@ -426,7 +426,7 @@ describe('xterm.js', function() {
       }
     });
     it('splitted surrogates', function() {
-      var high = '\uD800';
+      var high = String.fromCharCode(0xD800);
       for (var i=0xDC00; i<=0xDCFF; ++i) {
         xterm.write(high);
         xterm.write(String.fromCharCode(i));