Spec out Frame.as_string

lib/frame.js

@@ -19,4 +19,25 @@ Frame.prototype.build_frame = function(frame_args, want_receipt) {
   return this;
 };
 
+Frame.prototype.as_string = function() {
+  var frame = '',
+      header_strings = [];
+
+  frame += this.command + '\n';
+
+  for (var header in this.headers) {
+    header_strings.push(header + ':' + this.headers[header]);
+  }
+
+  frame += header_strings.join('\n') + '\n\n';
+
+  if (this.body) {
+    frame += this.body;
+  }
+
+  frame += '\x00';
+
+  return frame;
+};
+
 module.exports.Frame = Frame;

spec/FrameSpec.js

@@ -99,3 +99,42 @@ describe('When asking for a receipt', function() {
   });
 
 });
+
+describe('When asking for the frame as a string', function() {
+  var frame;
+  var receipt;
+  var frame_args;
+  var new_frame;
+
+  beforeEach(function() {
+    receipt = false;
+    frame_args = {
+      'body': 'test',
+      'headers': {'test': 'test'},
+      'command': 'test'
+    }
+    frame = new Frame();
+    new_frame = frame.build_frame(frame_args, receipt);
+  });
+
+  it('should return a string', function() {
+    expect(typeof(new_frame.as_string())).toBe('string');
+  });
+
+  it('should have the command, followed by a newline', function() {
+    expect(new_frame.as_string()).toMatch(/^test\n/);
+  });
+
+  it('should have one header, followed by two newlines', function() {
+    expect(new_frame.as_string()).toMatch(/^test\ntest:test\n\n/);
+  });
+
+  it('should have a body', function() {
+    expect(new_frame.as_string()).toMatch(/^test\ntest:test\n\ntest/);
+  });
+
+  it('should end with a null byte', function() {
+    expect(new_frame.as_string()).toMatch(/^test\ntest:test\n\ntest\0/);
+  });
+
+});