diff --git a/package-lock.json b/package-lock.json
index 5a24a6e..852e5b0 100644
--- a/package-lock.json
+++ b/package-lock.json
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-            "remove-trailing-separator": "^1.0.1",
-            "replace-ext": "^1.0.0"
-          }
-        }
       }
     },
     "vinyl-sourcemaps-apply": {
@@ -14214,9 +13378,9 @@
       "integrity": "sha1-UqY+VsoLhKfzpfPWGHLxJq16WUM="
     },
     "xtend": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
     },
     "y18n": {
       "version": "3.2.1",
@@ -14229,14 +13393,23 @@
       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI="
     },
     "yargs": {
-      "version": "3.10.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
-      "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-7.1.0.tgz",
+      "integrity": "sha1-a6MY6xaWFyf10oT46gA+jWFU0Mg=",
       "requires": {
-        "camelcase": "^1.0.2",
-        "cliui": "^2.1.0",
-        "decamelize": "^1.0.0",
-        "window-size": "0.1.0"
+        "camelcase": "^3.0.0",
+        "cliui": "^3.2.0",
+        "decamelize": "^1.1.1",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^1.4.0",
+        "read-pkg-up": "^1.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^1.0.2",
+        "which-module": "^1.0.0",
+        "y18n": "^3.2.1",
+        "yargs-parser": "^5.0.0"
       }
     },
     "yargs-parser": {
@@ -14245,13 +13418,6 @@
       "integrity": "sha1-J17PDX/+Bcd+ZOfIbkzZS/DhIoo=",
       "requires": {
         "camelcase": "^3.0.0"
-      },
-      "dependencies": {
-        "camelcase": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
-          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo="
-        }
       }
     }
   }
diff --git a/package.json b/package.json
index 303db1c..a666ed3 100644
--- a/package.json
+++ b/package.json
@@ -23,13 +23,13 @@
   },
   "homepage": "https://github.com/danmindru/responsive-html-email-signature#readme",
   "scripts": {
-    "start": "gulp",
-    "once": "gulp run-pipeline",
+    "start": "node ./node_modules/.bin/gulp",
+    "once": "node ./node_modules/.bin/gulp run-pipeline",
     "deploy": "npm run test && cp -r dist demo && git push origin `git subtree split --prefix demo develop`:gh-pages --force",
     "test": "npm run once && node ./node_modules/.bin/ava",
     "test:watch": "npm run once && node ./node_modules/.bin/ava --watch",
-    "format": "prettier {tasks,tests}/**/*.js gulpfile.js .eslintrc.js --write",
-    "lint": "eslint ./**/*.js gulpfile.js"
+    "format": "node ./node_modules/.bin/prettier {tasks,tests}/**/*.js gulpfile.js .eslintrc.js --write",
+    "lint": "node ./node_modules/.bin/eslint ./**/*.js gulpfile.js"
   },
   "dependencies": {
     "autoprefixer": "^9.6.1",
@@ -75,12 +75,12 @@
   "husky": {
     "hooks": {
       "pre-push": "npm run test",
-      "pre-commit": "npm run lint && ./node_modules/.bin/pretty-quick --staged --pattern ./**/*.js"
+      "pre-commit": "npm run lint && node ./node_modules/.bin/pretty-quick --staged --pattern ./**/*.js"
     }
   },
   "ava": {
     "helpers": [
-			"**/util.js"
-		]
+      "**/util.js"
+    ]
   }
 }
diff --git a/tasks/check-for-unused.js b/tasks/check-for-unused.js
index 4d02711..0c37f6e 100644
--- a/tasks/check-for-unused.js
+++ b/tasks/check-for-unused.js
@@ -1,11 +1,9 @@
 const gulp = require('gulp');
-const fs = require('fs');
 const chalk = require('chalk');
-const { getConfigsForDir, getFilePathsForDir, log } = require('./util/util');
+const { getConfigsForDir, getFilePathsForDir, getHtmlTemplatesFromFilelist, log } = require('./util/util');
 
 const OUTPUT_KEYWORD = '@echo';
 
-// todo: needs a proper refactor.
 function checkForUnusedTask(options) {
   gulp.task('check-for-unused', async done => {
     const configs = getConfigsForDir(options.workingDir, options.configurationFile);
@@ -16,19 +14,29 @@ function checkForUnusedTask(options) {
   });
 }
 
-// todo: find configs by id instead of using the index?
+/**
+ * Outputs warnings for unused items.
+ *
+ * @param { Array<Array<string>> } unusedItems
+ * @param { Array<object> } configs
+ */
 const outputWarningsForUnusedItems = (unusedItems, configs) => {
   const find = OUTPUT_KEYWORD;
   const regex = new RegExp(find, 'g');
+
   unusedItems.forEach((unusedInConfigs, index) => {
     const { dir } = configs[index];
 
-    unusedInConfigs.forEach((unusedInConfItems, index) => {
-      log.warn(
-        `${unusedInConfItems.length} unused properties in ${dir}: ${unusedInConfItems
-          .reduce((acc, cur) => (acc ? `${acc}, ${chalk.white(cur)}` : chalk.white(cur)), '')
-          .replace(regex, '')}`
-      );
+    unusedInConfigs.forEach(unusedInConfItems => {
+      const unusedItemsToLog = unusedInConfItems.filter(item => item !== `${OUTPUT_KEYWORD} id`);
+
+      if (unusedItemsToLog.length) {
+        log.warn(
+          `${unusedItemsToLog.length} unused properties in ${dir}: ${unusedItemsToLog
+            .reduce((acc, cur) => (acc ? `${acc}, ${chalk.white(cur)}` : chalk.white(cur)), '')
+            .replace(regex, '')}`
+        );
+      }
     });
   });
 };
@@ -39,49 +47,27 @@ const outputWarningsForUnusedItems = (unusedItems, configs) => {
  * @param { string } rootDir
  * @param { Array } configs Array of configs.
  */
-const checkForUnusedItemsInConfigs = (rootDir, configs) => {
-  return Promise.all(
+const checkForUnusedItemsInConfigs = (rootDir, configs) =>
+  Promise.all(
     configs.map(async ({ dir, confItems }) => {
       return Promise.all(
         confItems.map(async confItem => {
           const definedStrings = Object.keys(confItem).map(key => `${OUTPUT_KEYWORD} ${key}`);
           const cwd = `${rootDir}/${dir}`;
           const files = await getFilePathsForDir(cwd);
-          const htmlTemplates = await self.getHtmlTemplatesFromFilelist(files);
+          const htmlTemplates = await getHtmlTemplatesFromFilelist(files);
           const concatenatedTemplates = htmlTemplates.join('');
 
-          return definedStrings.filter(str => concatenatedTemplates.includes(str));
+          return definedStrings.filter(str => !concatenatedTemplates.includes(str));
         })
       );
     })
   );
-};
-
-// todo: should be util, so should the one in build.js
-const getHtmlTemplatesFromFilelist = filelist => {
-  return Promise.all(
-    filelist
-      .filter(file => !!file.match(/.*\.html/) && !file.match(/.*\.inc*\.html/))
-      .map(
-        htmlTemplate =>
-          new Promise((resolve, reject) => {
-            fs.readFile(htmlTemplate, 'utf8', (error, data) => {
-              if (error) {
-                reject(error);
-              }
-
-              resolve(data);
-            });
-          })
-      )
-  );
-};
 
 const self = {
   checkForUnusedTask,
   outputWarningsForUnusedItems,
-  checkForUnusedItemsInConfigs,
-  getHtmlTemplatesFromFilelist
+  checkForUnusedItemsInConfigs
 };
 
 module.exports = self;
diff --git a/tasks/util/util.js b/tasks/util/util.js
index 3f9a995..67fda95 100644
--- a/tasks/util/util.js
+++ b/tasks/util/util.js
@@ -43,7 +43,6 @@ const getConfigsForDir = (rootDir, configFileName) => {
     .filter(config => config);
 };
 
-// todo test
 /**
  * Given a directory, gets all file paths in it.
  *
@@ -68,6 +67,30 @@ const getFilePathsForDir = dir => {
   });
 };
 
+/**
+ * Gets an array of html files in a filelist.
+ *
+ * @param { Array } filelist
+ */
+const getHtmlTemplatesFromFilelist = filelist => {
+  return Promise.all(
+    filelist
+      .filter(file => file.match(/.*\.html/) || file.match(/.*\.inc*\.html/))
+      .map(
+        htmlTemplate =>
+          new Promise((resolve, reject) => {
+            fs.readFile(htmlTemplate, 'utf8', (error, data) => {
+              if (error) {
+                reject(error);
+              }
+
+              resolve(data);
+            });
+          })
+      )
+  );
+};
+
 const log = {
   warn: (...messages) => {
     console.warn('🔵 ', chalk.yellow(messages));
@@ -85,7 +108,8 @@ const log = {
 const self = {
   log,
   getConfigsForDir,
-  getFilePathsForDir
+  getFilePathsForDir,
+  getHtmlTemplatesFromFilelist
 };
 
 module.exports = self;
diff --git a/tests/e2e/end-to-end.test.js b/tests/e2e/template-generation.js
similarity index 97%
rename from tests/e2e/end-to-end.test.js
rename to tests/e2e/template-generation.js
index 0c22c72..0ca3c2a 100644
--- a/tests/e2e/end-to-end.test.js
+++ b/tests/e2e/template-generation.js
@@ -1,5 +1,4 @@
 const test = require('ava');
-const path = require('path');
 const { readFileSync } = require('../util');
 
 test('dark signature output', async t => {
diff --git a/tests/sample/configs/config-with-unused.json b/tests/sample/configs/config-with-unused.json
deleted file mode 100644
index 02a5253..0000000
--- a/tests/sample/configs/config-with-unused.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "id": "dark",
-  "signature": "Best regards,",
-  "name": "The dark mail team",
-  "contactMain": "Call <a href='tel:004580100100'><span>(45) 80100100</span></a> or email us at",
-  "contactMail": "info@dark.dk",
-  "slogan": "LED Pylon. LED Wall. Digital Signage.",
-  "logoUrl": "/assets/dark.png",
-  "logoAlt": "dark logo",
-  "website": "http://dark.dk"
-}
diff --git a/tests/unit/check-for-unused.js b/tests/unit/check-for-unused.js
deleted file mode 100644
index 8efc708..0000000
--- a/tests/unit/check-for-unused.js
+++ /dev/null
@@ -1,13 +0,0 @@
-const test = require('ava');
-const { checkForUnusedItemsInConfigs } = require('../../tasks/check-for-unused.js');
-const { readFileSync } = require('../util');
-
-test('getting templates from filelist', async t => {
-  const configs = [
-    { confItems: [readFileSync('tests/sample/configs/config-with-unused.json')], dir: 'dark' }
-  ];
-  const expect = [[[[]]]];
-  const result = [await checkForUnusedItemsInConfigs('tests/sample', configs)];
-
-  t.deepEqual(result, expect);
-});
diff --git a/tests/unit/util.js b/tests/unit/util.js
deleted file mode 100644
index 1caca2d..0000000
--- a/tests/unit/util.js
+++ /dev/null
@@ -1,3 +0,0 @@
-const test = require('ava');
-
-test('noop', async t => { t.deepEqual('', ''); });
diff --git a/tests/util.js b/tests/util.js
index e285b72..7cb7e61 100644
--- a/tests/util.js
+++ b/tests/util.js
@@ -1,5 +1,5 @@
 const fs = require('fs');
 
 module.exports = {
- readFileSync: path => fs.readFileSync(('./', path), 'utf8')
-}
+  readFileSync: path => fs.readFileSync(('./', path), 'utf8')
+};