close #23 with new getHeader() method

lib/response.js

@@ -50,6 +50,15 @@ class RESPONSE {
     return this
   }
 
+  // Adds a header field
+  getHeader(field) {
+    if (!field) return this._headers // return all headers
+    for (const header in this._headers) { // loop through headers
+      if (header.toLowerCase() === field.toLowerCase()) return this._headers[header]
+    } // end for
+    return null // return null for not found
+  }
+
   // Convenience method for JSON
   json(body) {
     this.header('Content-Type','application/json').send(JSON.stringify(body))

test/headers.js

@@ -39,6 +39,16 @@ api.get('/testJSONP', function(req,res) {
   res.status(200).html({ method: 'get', status: 'ok' })
 })
 
+api.get('/getHeader', function(req,res) {
+  res.status(200).header('TestHeader','test')
+  res.json({
+    headers: res.getHeader(),
+    typeHeader: res.getHeader('TestHeader'),
+    typeHeaderCase: res.getHeader('coNtEnt-TyPe'),
+    typeHeaderMissing: res.getHeader('test')
+  })
+})
+
 
 /******************************************************************************/
 /***  BEGIN TESTS                                                           ***/
@@ -76,4 +86,22 @@ describe('Header Tests:', function() {
     })
   }) // end it
 
+
+  it('Get Header', function() {
+    let _event = Object.assign({},event,{ path: '/getHeader'})
+
+    return new Promise((resolve,reject) => {
+      api.run(_event,{},function(err,res) { resolve(res) })
+    }).then((result) => {
+      expect(result).to.deep.equal({
+        headers: {
+          'Content-Type': 'application/json',
+          'TestHeader': 'test'
+        }, statusCode: 200,
+        body: '{"headers":{"Content-Type":"application/json","TestHeader":"test"},"typeHeader":"test","typeHeaderCase":"application/json","typeHeaderMissing":null}',
+        isBase64Encoded: false
+      })
+    })
+  }) // end it
+
 }) // end HEADER tests