Add tests for -0

Author: mathiasbynens

tests/tests.js

@@ -9,6 +9,11 @@ var tests = [
 		'position': -1,
 		'result': undefined
 	},
+	{
+		'string': 'abc\uD834\uDF06def',
+		'position': -0,
+		'result': 0x61
+	},
 	{
 		'string': 'abc\uD834\uDF06def',
 		'position': 0,
@@ -80,6 +85,11 @@ var tests = [
 		'position': -1,
 		'result': undefined
 	},
+	{
+		'string': '\uD834\uDF06def',
+		'position': -0,
+		'result': 0x1D306
+	},
 	{
 		'string': '\uD834\uDF06def',
 		'position': 0,
@@ -131,6 +141,11 @@ var tests = [
 		'position': -1,
 		'result': undefined
 	},
+	{
+		'string': '\uD834abc',
+		'position': -0,
+		'result': 0xD834
+	},
 	{
 		'string': '\uD834abc',
 		'position': 0,
@@ -172,6 +187,11 @@ var tests = [
 		'position': -1,
 		'result': undefined
 	},
+	{
+		'string': '\uDF06abc',
+		'position': -0,
+		'result': 0xDF06
+	},
 	{
 		'string': '\uDF06abc',
 		'position': 0,