Add convertToBase64 method

tests/cases/unittests/convertToBase64.ts

@@ -0,0 +1,33 @@
+/// <reference path="..\..\..\src\harness\harness.ts" />
+
+module ts {
+    describe('convertToBase64', () => {
+        function runTest(input: string): void {
+            var actual = ts.convertToBase64(input);
+            var expected = new Buffer(input).toString("base64");
+            assert.equal(actual, expected, "Encoded string using convertToBase64 does not match buffer.toString('base64')");
+        }
+
+        it("Converts ASCII charaters correctelly", () => {
+            runTest(" !\"#$ %&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~");
+        });
+
+        it("Converts escape sequences correctelly", () => {
+            runTest("\t\n\r\\\"\'\u0062");
+        });
+
+        it("Converts simple unicode characters correctelly", () => {
+            runTest("ΠΣ ٵپ औठ ⺐⺠");
+        });
+
+        it("Converts simple code snippit correctelly", () => {
+            runTest(`/// <reference path="file.ts" /> 
+var x: string = "string";
+console.log(x);`);
+        });
+
+        it("Converts simple code snippit with unicode characters correctelly", () => {
+            runTest(`var Π = 3.1415; console.log(Π);`);
+        });
+    });
+}