diff --git a/package-lock.json b/package-lock.json
index 007806b..f2ae87c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,9 @@
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-      "version": "5.7.2",
-      "resolved": "https://registry.npmjs.org/@financial-times/n-logger/-/n-logger-5.7.2.tgz",
-      "integrity": "sha1-tR/WW6c4FdklaEQUl2yQOIUZsU8=",
-      "dev": true,
+      "version": "10.3.0",
+      "resolved": "https://registry.npmjs.org/@financial-times/n-logger/-/n-logger-10.3.0.tgz",
+      "integrity": "sha512-2mAU1JxAp+9J2rjxNbAumir9Fz7nhtFRBNTwqACtllmCqf4r8UjqimftWxTU3t/888wU0ujUHFvOFI7zX03ahw==",
       "requires": {
-        "isomorphic-fetch": "^2.2.1",
-        "request": "^2.83.0",
+        "json-stringify-safe": "^5.0.1",
+        "node-fetch": "^2.6.7",
         "winston": "^2.4.0"
+      },
+      "dependencies": {
+        "node-fetch": {
+          "version": "2.6.7",
+          "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.7.tgz",
+          "integrity": "sha512-ZjMPFEfVx5j+y2yF35Kzx5sF7kDzxuDj6ziH4FFbOp87zKDZNx8yExJIb05OGF4Nlt9IHFIMBkRl41VdvcNdbQ==",
+          "requires": {
+            "whatwg-url": "^5.0.0"
+          }
+        }
       }
     },
     "@financial-times/n-pa11y-config": {
@@ -14951,7 +14980,7 @@
     "assert-plus": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
-      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "integrity": "sha512-NfJ4UzBCcQGLDlQq7nHxH+tv3kyZ0hHQqF5BO6J7tNJeP5do1llPr8dZ8zHonfhAu0PHAdMkSo+8o0wxg9lZWw==",
       "dev": true
     },
     "assertion-error": {
@@ -14975,7 +15004,7 @@
     "asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
-      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==",
       "dev": true
     },
     "autoprefixer": {
@@ -15002,7 +15031,7 @@
     "aws-sign2": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
-      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
+      "integrity": "sha512-08kcGqnYf/YmjoRhfxyu+CLxBjUtHLXLXX/vUfx9l2LYzG3c1m61nrpyFUZI6zeS+Li/wWMMidD9KgrqtGq3mA==",
       "dev": true
     },
     "aws4": {
@@ -15343,7 +15372,7 @@
     "caseless": {
       "version": "0.12.0",
       "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
-      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
+      "integrity": "sha512-4tYFyifaFfGacoiObjJegolkwSU4xQNGbVgUiNYVUxbQ2x2lUsFvY4hVgVzGiIe6WLOPqycWXA40l+PWsxthUw==",
       "dev": true
     },
     "chai": {
@@ -15815,7 +15844,7 @@
     "dashdash": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
-      "integrity": "sha1-hTz6D3y+L+1d4gMmuN1YEDX24vA=",
+      "integrity": "sha512-jRFi8UDGo6j+odZiEpjazZaWqEal3w/basFjQHQEwVtZJGDpxbH1MeYluwCS8Xq5wmLJooDlMgvVarmWfGM44g==",
       "dev": true,
       "requires": {
         "assert-plus": "^1.0.0"
@@ -15982,7 +16011,7 @@
     "delayed-stream": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
-      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
+      "integrity": "sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==",
       "dev": true
     },
     "denodeify": {
@@ -16178,7 +16207,7 @@
     "ecc-jsbn": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz",
-      "integrity": "sha1-OoOpBOVDUyh4dMVkt1SThoSamMk=",
+      "integrity": "sha512-eh9O+hwRHNbG4BLTjEl3nw044CkGm5X6LoaCf7LPp7UU8Qrt47JYNi6nPX8xjW97TKGKm1ouctg0QSpZe9qrnw==",
       "dev": true,
       "requires": {
         "jsbn": "~0.1.0",
@@ -16638,7 +16667,7 @@
     "extsprintf": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.3.0.tgz",
-      "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU=",
+      "integrity": "sha512-11Ndz7Nv+mvAC1j0ktTa7fAb0vLyGGX+rMHNBYQviQDGU0Hw7lhctJANqbPhu9nV9/izT/IntTgZ7Im/9LJs9g==",
       "dev": true
     },
     "eyes": {
@@ -16775,7 +16804,7 @@
     "forever-agent": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/forever-agent/-/forever-agent-0.6.1.tgz",
-      "integrity": "sha1-+8cfDEGt6zf5bFd60e1C2P2sypE=",
+      "integrity": "sha512-j0KLYPhm6zeac4lz3oJ3o65qvgQCcPubiyotZrXqEaG4hNagNYO8qdlUrX5vwqv9ohqeT/Z3j6+yW067yWWdUw==",
       "dev": true
     },
     "form-data": {
@@ -16878,7 +16907,7 @@
     "getpass": {
       "version": "0.1.7",
       "resolved": "https://registry.npmjs.org/getpass/-/getpass-0.1.7.tgz",
-      "integrity": "sha1-Xv+OPmhNVprkyysSgmBOi6YhSfo=",
+      "integrity": "sha512-0fzj9JxOLfJ+XGLhR8ze3unN0KZCgZwiSSDz168VERjK8Wl8kVSdcu2kspd4s4wtAa1y/qrVRiAA0WclVsu0ng==",
       "dev": true,
       "requires": {
         "assert-plus": "^1.0.0"
@@ -17082,7 +17111,7 @@
     "har-schema": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",
-      "integrity": "sha1-qUwiJOvKwEeCoNkDVSHyRzW37JI=",
+      "integrity": "sha512-Oqluz6zhGX8cyRaTQlFMPw80bSJVG2x/cFb8ZPhUILGgHka9SsokCCOQgpveePerqidZOrT14ipqfJb7ILcW5Q==",
       "dev": true
     },
     "har-validator": {
@@ -17191,7 +17220,7 @@
     "http-signature": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/http-signature/-/http-signature-1.2.0.tgz",
-      "integrity": "sha1-muzZJRFHcvPZW2WmCruPfBj7rOE=",
+      "integrity": "sha512-CAbnr6Rz4CYQkLYUtSNXxQPUH2gK8f3iWexVlsnMeD+GjlsQ0Xsy1cOX+mN3dtxYomRy21CiOzU8Uhw6OwncEQ==",
       "dev": true,
       "requires": {
         "assert-plus": "^1.0.0",
@@ -17824,7 +17853,7 @@
     "jsbn": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/jsbn/-/jsbn-0.1.1.tgz",
-      "integrity": "sha1-peZUwuWi3rXyAdls77yoDA7y9RM=",
+      "integrity": "sha512-UVU9dibq2JcFWxQPA6KCqj5O42VOmAY3zQUfEKxU0KpTGXwNoCjkX1e13eHNvw/xPynt6pU0rZ1htjWTNTSXsg==",
       "dev": true
     },
     "jsesc": {
@@ -17865,9 +17894,9 @@
       "dev": true
     },
     "json-schema": {
-      "version": "0.2.3",
-      "resolved": "https://registry.npmjs.org/json-schema/-/json-schema-0.2.3.tgz",
-      "integrity": "sha1-tIDIkuWaLwWVTOcnvT8qTogvnhM=",
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/json-schema/-/json-schema-0.4.0.tgz",
+      "integrity": "sha512-es94M3nTIfsEPisRafak+HDLfHXnKBhV3vU5eqPcS3flIWqcxJWgXHXiey3YrpaNsanY5ei1VoYEbOzijuq9BA==",
       "dev": true
     },
     "json-schema-traverse": {
@@ -17907,14 +17936,14 @@
       }
     },
     "jsprim": {
-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/jsprim/-/jsprim-1.4.1.tgz",
-      "integrity": "sha1-MT5mvB5cwG5Di8G3SZwuXFastqI=",
+      "version": "1.4.2",
+      "resolved": "https://registry.npmjs.org/jsprim/-/jsprim-1.4.2.tgz",
+      "integrity": "sha512-P2bSOMAc/ciLz6DzgjVlGJP9+BrJWu5UDGK70C2iweC5QBIeFf0ZXRvGjEj2uYgrY2MkAAhsSWHDWlFtEroZWw==",
       "dev": true,
       "requires": {
         "assert-plus": "1.0.0",
         "extsprintf": "1.3.0",
-        "json-schema": "0.2.3",
+        "json-schema": "0.4.0",
         "verror": "1.10.0"
       }
     },
@@ -18603,18 +18632,18 @@
       }
     },
     "mime-db": {
-      "version": "1.49.0",
-      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.49.0.tgz",
-      "integrity": "sha512-CIc8j9URtOVApSFCQIF+VBkX1RwXp/oMMOrqdyXSBXq5RWNEsRfyj1kiRnQgmNXmHxPoFIxOroKA3zcU9P+nAA==",
+      "version": "1.52.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
+      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==",
       "dev": true
     },
     "mime-types": {
-      "version": "2.1.32",
-      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.32.tgz",
-      "integrity": "sha512-hJGaVS4G4c9TSMYh2n6SQAGrC4RnfU+daP8G7cSCmaqNjiOoUY0VHCMS42pxnQmVF1GWwFhbHWn3RIxCqTmZ9A==",
+      "version": "2.1.35",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.35.tgz",
+      "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
       "dev": true,
       "requires": {
-        "mime-db": "1.49.0"
+        "mime-db": "1.52.0"
       }
     },
     "mimic-fn": {
@@ -18771,6 +18800,11 @@
         }
       }
     },
+    "mockery": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/mockery/-/mockery-2.1.0.tgz",
+      "integrity": "sha512-9VkOmxKlWXoDO/h1jDZaS4lH33aWfRiJiNT/tKj+8OGzrcFDLo8d0syGdbsc3Bc4GvRXPb+NMMvojotmuGJTvA=="
+    },
     "ms": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
@@ -18812,26 +18846,6 @@
         "@financial-times/n-logger": "^10.2.0",
         "isomorphic-fetch": "^2.1.1",
         "npm-prepublish": "^1.2.2"
-      },
-      "dependencies": {
-        "@financial-times/n-logger": {
-          "version": "10.2.0",
-          "resolved": "https://registry.npmjs.org/@financial-times/n-logger/-/n-logger-10.2.0.tgz",
-          "integrity": "sha512-7mjjYNSMklnTky+WLhFqdFvT6VBM+QOHkMnfoclqv0YoJlatY/oP8MtfeufxXqGBzGJrRH90xbq0Qs1InracXQ==",
-          "requires": {
-            "json-stringify-safe": "^5.0.1",
-            "node-fetch": "^2.6.0",
-            "winston": "^2.4.0"
-          }
-        },
-        "node-fetch": {
-          "version": "2.6.7",
-          "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.7.tgz",
-          "integrity": "sha512-ZjMPFEfVx5j+y2yF35Kzx5sF7kDzxuDj6ziH4FFbOp87zKDZNx8yExJIb05OGF4Nlt9IHFIMBkRl41VdvcNdbQ==",
-          "requires": {
-            "whatwg-url": "^5.0.0"
-          }
-        }
       }
     },
     "natural-compare": {
@@ -19519,7 +19533,7 @@
     "performance-now": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
-      "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=",
+      "integrity": "sha512-7EAHlyLHI56VEIdK57uwHdHKIaAGbnXPiw0yWbarQZOKaKpvUIgW0jWRVLiatnM+XXlSwsanIBH/hzGMJulMow==",
       "dev": true
     },
     "picomatch": {
@@ -19783,9 +19797,9 @@
       "dev": true
     },
     "psl": {
-      "version": "1.8.0",
-      "resolved": "https://registry.npmjs.org/psl/-/psl-1.8.0.tgz",
-      "integrity": "sha512-RIdOzyoavK+hA18OGGWDqUTsCLhtA7IcZ/6NCs4fFJaHBDab+pDDmDIByWFRQJq2Cd7r1OoQxBGKOaztq+hjIQ==",
+      "version": "1.9.0",
+      "resolved": "https://registry.npmjs.org/psl/-/psl-1.9.0.tgz",
+      "integrity": "sha512-E/ZsdU4HLs/68gYzgGTkMicWTLPdAftJLfJFlLUAAKZGkStNU72sZjT66SnMDVOfOWY/YAoiD7Jxa9iHvngcag==",
       "dev": true
     },
     "pump": {
@@ -19837,9 +19851,9 @@
       }
     },
     "qs": {
-      "version": "6.5.2",
-      "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.2.tgz",
-      "integrity": "sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==",
+      "version": "6.5.3",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.3.tgz",
+      "integrity": "sha512-qxXIEh4pCGfHICj1mAJQ2/2XVZkjCDTcEgfoSQxc/fYivUZxTkk7L3bDBJSoNrEzXI17oUO5Dp07ktqE5KzczA==",
       "dev": true
     },
     "queue": {
@@ -21479,9 +21493,9 @@
       }
     },
     "sshpk": {
-      "version": "1.16.1",
-      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.16.1.tgz",
-      "integrity": "sha512-HXXqVUq7+pcKeLqqZj6mHFUMvXtOJt1uoUx09pFW6011inTMxqI8BA8PM95myrIyyKwdnzjdFjLiE6KBPVtJIg==",
+      "version": "1.17.0",
+      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.17.0.tgz",
+      "integrity": "sha512-/9HIEs1ZXGhSPE8X6Ccm7Nam1z8KcoCqPdI7ecm1N33EzAetWahvQWVqLZtaZQ+IDKX4IyA2o0gBzqIMkAagHQ==",
       "dev": true,
       "requires": {
         "asn1": "~0.2.3",
@@ -22441,7 +22455,7 @@
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
-      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "integrity": "sha512-McnNiV1l8RYeY8tBgEpuodCC1mLUdbSN+CYBL7kJsJNInOP8UjDDEwdk6Mw60vdLLrr5NHKZhMAOSrR2NZuQ+w==",
       "dev": true,
       "requires": {
         "safe-buffer": "^5.0.1"
@@ -22716,7 +22730,7 @@
     "verror": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
-      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "integrity": "sha512-ZZKSmDAEFOijERBLkmYfJ+vmk3w+7hOLYDNkRCuRuMJGEmqYNCNLyBBFwWKVMhfwaEF3WOd0Zlw86U/WC/+nYw==",
       "dev": true,
       "requires": {
         "assert-plus": "^1.0.0",
diff --git a/package.json b/package.json
index 635cfe6..875c9bf 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,9 @@
     "lib": "./lib"
   },
   "dependencies": {
+    "@financial-times/n-logger": "^10.3.0",
     "isomorphic-fetch": "^2.0.0",
+    "mockery": "^2.1.0",
     "n-eager-fetch": "^5.1.0"
   },
   "devDependencies": {
diff --git a/src/poller.js b/src/poller.js
index 5be5858..fad76c2 100644
--- a/src/poller.js
+++ b/src/poller.js
@@ -1,11 +1,12 @@
 'use strict';
 const errors = require('./errors');
+const logger = require('@financial-times/n-logger').default;
 
 require ('isomorphic-fetch');
 
 module.exports = EventEmitter => {
 
-	return class Poller extends EventEmitter {
+	class Poller extends EventEmitter {
 
 		constructor (config) {
 			super ();
@@ -16,6 +17,7 @@ module.exports = EventEmitter => {
 			this.url = config.url;
 			this.options = config.options || {};
 			this.data = config.defaultData;
+			this.state = Poller.states.INITIAL;
 			this.options.timeout = this.options.timeout || 4000;
 
 			this.options.headers = this.options.headers || {};
@@ -102,19 +104,48 @@ module.exports = EventEmitter => {
 				})
 				.then (async s => {
 					this.data = await this.parseData (s);
+					this.setState (Poller.states.FRESH);
 					this.emit ('data', this.data);
 				})
 				.catch ((err) => {
+					if (this.state === Poller.states.INITIAL) {
+						this.setState (Poller.states.ERRORING, err);
+					} else {
+						this.setState (Poller.states.STALE, err);
+					}
 					this.emit ('error', err);
 				});
 		}
 
-		getData () {
-			if (this.error) {
-				throw this.error;
+		setState (state, error) {
+			this.state = state;
+			if (state === Poller.states.ERRORING) {
+				logger.error (
+					'Poller is serving default data. It was unable to fetch fresh data',
+					{ event: 'POLLER_DATA_DEFAULT' },
+					error
+				);
 			}
+			if (state === Poller.states.STALE) {
+				logger.warn (
+					'Poller is serving stale data. It was unable to fetch fresh data',
+					{ event: 'POLLER_DATA_STALE' },
+					error
+				);
+			}
+		}
 
+		getData () {
 			return this.data;
 		}
 	};
+
+	Poller.states = {
+		INITIAL: 'initial',
+		ERRORING: 'erroring',
+		STALE: 'stale',
+		FRESH: 'fresh'
+	};
+
+	return Poller;
 };
diff --git a/tests/poller.spec.js b/tests/poller.spec.js
index 39eb902..9a93f0d 100644
--- a/tests/poller.spec.js
+++ b/tests/poller.spec.js
@@ -1,12 +1,25 @@
 /* global it, describe, xit */
 
+const mockery = require ('mockery');
 const chai = require ('chai');
-const Poller = require ('../src/server');
 const sinon = require ('sinon');
 const nock = require ('nock');
 const expect = chai.expect;
 const HttpError = require('../src/errors').HttpError;
 
+mockery.enable ({
+	warnOnReplace: false,
+	warnOnUnregistered: false
+});
+
+const mockLogger = {
+	error: sinon.stub(),
+	warn: sinon.stub()
+};
+mockery.registerMock ('@financial-times/n-logger', { default: mockLogger });
+
+const Poller = require ('../src/server');
+
 describe ('Poller', function () {
 
 	it ('Should exist', function () {
@@ -168,55 +181,29 @@ describe ('Poller', function () {
 
 	});
 
-	it ('Should throw from getData when fetch has received an HTTP error', function (done) {
+	it ('Should return defaultData if the server errors after the poller autostarts without listening for errors', function (done) {
 
 		const ft = nock ('http://example.com')
 			.get ('/')
 			.reply (503, {});
 
-		const p = new Poller({
-			url: 'http://example.com'
-		});
-
-		p.fetch ();
-
-		setTimeout (function () {
-			expect (ft.isDone ()).to.be.true; // ensure Nock has been used
-			expect (function () {
-				p.getData ();
-			}).to.throw ('HTTP Error 503 Service Unavailable');
-			done ();
-		}, 10);
-
-	});
-
-	it ('Should return data from getData when fetch has received an HTTP error followed by a success', function (done) {
-
-		const ft = nock ('http://example.com');
+		const defaultData = [1, 2, 3]
 
 		const p = new Poller({
-			url: 'http://example.com'
+			url: 'http://example.com',
+			defaultData,
+			autostart: true,
 		});
 
-		ft.get ('/').reply (503, '<h1>error</h1>');
-
-		p.fetch ();
+		const eventEmitterStub = sinon.stub (p, 'emit');
 
 		setTimeout (function () {
-			expect (ft.isDone ()).to.be.true; // ensure Nock has been used
-			expect (function () {
-				p.getData ();
-			}).to.throw ('HTTP Error 503 Service Unavailable');
-
-			ft.get ('/').reply (200, '<h1>website</h1>')
-
-			p.fetch()
-
-			setTimeout (function () {
-				expect (p.getData ()).to.equal ('<h1>website</h1>');
-				done ();
-			}, 10);
-
+			expect (p.getData()).to.deep.equal(defaultData);
+			expect (ft.isDone()).to.be.true; // ensure Nock has been used
+			expect (eventEmitterStub.calledOnce).to.be.true;
+			expect (eventEmitterStub.getCall (0).args[0]).to.equal ('error');
+			expect(eventEmitterStub.getCall (0).args[1]).to.be.an.instanceOf(HttpError);
+			done ();
 		}, 10);
 
 	});
@@ -420,4 +407,107 @@ describe ('Poller', function () {
 		p.start ({initialRequest:true});
 	});
 
+	describe('state management and logging', () => {
+		let poller;
+
+		beforeEach(() => {
+			mockLogger.error.reset();
+			mockLogger.warn.reset();
+			poller = new Poller({
+				url: 'http://example.com/states',
+				defaultData: { isDefaultData: true }
+			});
+		});
+
+		it('should have a state of "initial"', () => {
+			expect(poller.state).to.equal('initial');
+		});
+
+		it('should have default data', () => {
+			expect(poller.getData()).to.deep.equal({ isDefaultData: true });
+		});
+
+		describe('when the first fetch resolves', () => {
+
+			beforeEach(async () => {
+				nock('http://example.com')
+					.get('/states')
+					.once()
+					.reply(200, { isOriginalData: true });
+				await poller.fetch();
+			});
+
+			it('should have a state of "fresh"', () => {
+				expect(poller.state).to.equal('fresh');
+			});
+
+			it('should have fresh data', () => {
+				expect(poller.getData()).to.deep.equal({ isOriginalData: true });
+			});
+
+			it('should not log errors or warnings', () => {
+				expect(mockLogger.error.callCount).to.equal(0);
+				expect(mockLogger.warn.callCount).to.equal(0);
+			});
+
+			describe('when the second fetch rejects', () => {
+
+				beforeEach(async () => {
+					nock('http://example.com')
+						.get('/states')
+						.once()
+						.reply(500, { isDataFromError: true });
+					await poller.fetch();
+				});
+
+				it('should have a state of "stale"', () => {
+					expect(poller.state).to.equal('stale');
+				});
+
+				it('should have stale data', () => {
+					expect(poller.getData()).to.deep.equal({ isOriginalData: true });
+				});
+
+				it('should log a warning message', () => {
+					expect(mockLogger.warn.callCount).to.equal(1);
+					const args = mockLogger.warn.getCall(0).args;
+					expect(args[0]).to.equal('Poller is serving stale data. It was unable to fetch fresh data');
+					expect(args[1]).to.deep.equal({ event: 'POLLER_DATA_STALE' });
+					expect(args[2]).to.be.instanceOf(HttpError);
+				});
+
+			});
+
+		});
+
+		describe('when the first fetch rejects', () => {
+
+			beforeEach(async () => {
+				nock('http://example.com')
+					.get('/states')
+					.once()
+					.reply(500, { isDataFromError: true });
+				await poller.fetch();
+			});
+
+			it('should have a state of "erroring"', () => {
+				expect(poller.state).to.equal('erroring');
+			});
+
+			it('should have default data', () => {
+				expect(poller.getData()).to.deep.equal({ isDefaultData: true });
+			});
+
+			it('should log an error message', () => {
+				expect(mockLogger.error.callCount).to.equal(1);
+				const args = mockLogger.error.getCall(0).args;
+				expect(args[0]).to.equal('Poller is serving default data. It was unable to fetch fresh data');
+				expect(args[1]).to.deep.equal({ event: 'POLLER_DATA_DEFAULT' });
+				expect(args[2]).to.be.instanceOf(HttpError);
+			});
+
+		});
+
+	});
+
 });