refactor response headers normalization into it's own method

lib/mock-ajax.js

@@ -182,6 +182,26 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
       }
     }
 
+    function normalizeHeaders(rawHeaders, contentType) {
+      var headers = [];
+
+      if (rawHeaders) {
+        if (rawHeaders instanceof Array) {
+          headers = rawHeaders;
+        } else {
+          for (var headerName in rawHeaders) {
+            if (rawHeaders.hasOwnProperty(headerName)) {
+              headers.push({ name: headerName, value: rawHeaders[headerName] });
+            }
+          }
+        }
+      } else {
+        headers.push({ name: "Content-Type", value: contentType || "application/json" });
+      }
+
+      return headers;
+    }
+
     var iePropertiesThatCannotBeCopied = ['responseBody', 'responseText', 'responseXML', 'status', 'statusText', 'responseTimeout'];
     extend(FakeXMLHttpRequest.prototype, new window.XMLHttpRequest(), iePropertiesThatCannotBeCopied);
     extend(FakeXMLHttpRequest.prototype, {
@@ -247,7 +267,19 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
       },
 
       getResponseHeader: function(name) {
-        return findHeader(name, this.responseHeaders);
+        name = name.toLowerCase();
+        var resultHeader;
+        for(var i = 0; i < this.responseHeaders.length; i++) {
+          var header = this.responseHeaders[i];
+          if (name === header.name.toLowerCase()) {
+            if (resultHeader) {
+              resultHeader = [resultHeader, header.value].join(', ');
+            } else {
+              resultHeader = header.value;
+            }
+          }
+        }
+        return resultHeader;
       },
 
       getAllResponseHeaders: function() {
@@ -269,30 +301,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
         this.statusText = response.statusText || "";
         this.responseText = response.responseText || "";
         this.readyState = 4;
-        this.responseHeaders = [];
-
-        var i;
-        if (response.responseHeaders) {
-          if (response.responseHeaders instanceof Array) {
-            this.responseHeaders = response.responseHeaders;
-          } else {
-            for (i in response.responseHeaders) {
-              if (response.responseHeaders.hasOwnProperty(i)) {
-                this.responseHeaders.push({ name: i, value: response.responseHeaders[i] });
-              }
-            }
-          }
-        } else {
-          this.responseHeaders.push({ name: "Content-Type", value: response.contentType || "application/json" });
-        }
-
-        for (i = 0; i < this.responseHeaders.length; i++) {
-          if (typeof(this.responseHeaders[this.responseHeaders[i].name]) === 'undefined') {
-            this.responseHeaders[this.responseHeaders[i].name] = this.responseHeaders[i].value;
-          } else {
-            this.responseHeaders[this.responseHeaders[i].name] += ', ' + this.responseHeaders[i].value;
-          }
-        }
+        this.responseHeaders = normalizeHeaders(response.responseHeaders, response.contentType);
 
         this.onload();
         this.onreadystatechange();

spec/javascripts/mock-ajax-toplevel-spec.js

@@ -20,7 +20,7 @@ describe("Jasmine Mock Ajax (for toplevel)", function() {
     onreadystatechange = function() {
       if (this.readyState === (this.DONE || 4)) { // IE 8 doesn't support DONE
         if (this.status === 200) {
-          if (this.responseHeaders['Content-Type'] === 'application/json') {
+          if (this.getResponseHeader('Content-Type') === 'application/json') {
             this.response = JSON.parse(this.responseText);
           } else {
             this.response = this.responseText;

spec/javascripts/webmock-style-spec.js

@@ -38,7 +38,7 @@ describe("Webmock style mocking", function() {
 
   it("should set the contentType", function() {
     sendRequest(fakeGlobal);
-    expect(response.responseHeaders['Content-Type']).toEqual('application/json');
+    expect(response.getResponseHeader('Content-Type')).toEqual('application/json');
   });
 
   it("should set the responseText", function() {