Added tests for customHeaders.

http://code.google.com/p/phantomjs/issues/detail?id=77.

test/webpage-spec.js

@@ -76,6 +76,11 @@ describe("WebPage object", function() {
         expect(page.settings).toNotEqual({});
     });
 
+    expectHasProperty(page, 'customHeaders');
+    it("should have customHeaders as an empty object", function() {
+            expect(page.customHeaders).toEqual({});
+    });
+
     checkViewportSize(page, {height:300,width:400});
 
     expectHasFunction(page, 'deleteLater');
@@ -275,6 +280,49 @@ describe("WebPage object", function() {
             expect(page.evaluate(function() { return caughtError })).toEqual(true);
         });
     })
+
+    it("should set custom headers properly", function() {
+        var server = require('webserver').create();
+        server.listen(12345, function(request, response) {
+            // echo received request headers in response body
+            response.write(JSON.stringify(request.headers));
+            response.close();
+        });
+
+        var url = "http://localhost:12345/foo/headers.txt?ab=cd";
+        var customHeaders = {
+            "Custom-Key" : "Custom-Value",
+            "User-Agent" : "Overriden-UA",
+            "Referer" : "Overriden-Referer",
+        };
+        page.customHeaders = customHeaders;
+
+        var handled = false;
+        runs(function() {
+            expect(handled).toEqual(false);
+            page.open(url, function (status) {
+                expect(status == 'success').toEqual(true);
+                handled = true;
+
+                var echoedHeaders = JSON.parse(page.plainText);
+                // console.log(JSON.stringify(echoedHeaders, null, 4));
+                // console.log(JSON.stringify(customHeaders, null, 4));
+
+                expect(echoedHeaders["Custom-Key"]).toEqual(customHeaders["Custom-Key"]);
+                expect(echoedHeaders["User-Agent"]).toEqual(customHeaders["User-Agent"]);
+                expect(echoedHeaders["Referer"]).toEqual(customHeaders["Referer"]);
+
+            });
+        });
+
+        waits(50);
+
+        runs(function() {
+            expect(handled).toEqual(true);
+            server.close();
+        });
+
+    });
 });
 
 describe("WebPage construction with options", function () {