diff --git a/.gitignore b/.gitignore
new file mode 100644
index 000000000..0bfc0ef9d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+node_modules/
+
+# Test files
+duplicates.json
\ No newline at end of file
diff --git a/README.md b/README.md
index e28c159f2..b1b03d7f8 100644
--- a/README.md
+++ b/README.md
@@ -80,6 +80,20 @@ Then run the **demo.js**:
 $ node demo.js
 ```
 
+## Tests
+
+Issue #257
+
+### Duplicate quotes
+
+Duplicate quotes can be found by running: 
+
+```
+npm run test:duplicates
+```
+
+If any duplicate quotes are found, they will be output to a `duplicates.json` file to review. This only looks for duplicate quotes, not authors.
+
 ## Related Works
 
 [![Quotter](https://img.shields.io/badge/GitHub%20Repo-Quotter-follow.svg?logo=github&style=social)](https://github.com/vinitshahdeo/Quotter) [![Twitter Follow](https://img.shields.io/twitter/follow/SayHiToQuotter.svg?style=social&logoColor=teal)](https://twitter.com/SayHiToQuotter)
diff --git a/package.json b/package.json
index ed3209bfd..c74f84e71 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,8 @@
   "description": "A simple NPM Package which returns Inspirational Quotes. Get your daily quote and stay motivated!",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "mocha",
+    "test:duplicates": "mocha test/duplicates.js"
   },
   "repository": {
     "type": "git",
@@ -25,6 +26,10 @@
   },
   "directories": {
     "example": "examples",
-    "data":"data"
+    "data": "data"
+  },
+  "devDependencies": {
+    "chai": "^4.2.0",
+    "mocha": "^6.2.2"
   }
 }
diff --git a/test/duplicates.js b/test/duplicates.js
new file mode 100644
index 000000000..b3159af7c
--- /dev/null
+++ b/test/duplicates.js
@@ -0,0 +1,28 @@
+const fs = require('fs')
+const expect = require('chai').expect;
+const inputQuotesJson = require('../data/data.json')
+
+const formatQuote = (quote) => {
+    return quote.replace(/\W/g, '').toLowerCase().trim();
+}
+
+describe('Quotes', () => {
+    const duplicateQuotes = [];
+    it('Checks for duplicate quotes', () => {
+        const quoteSet = new Set();
+        inputQuotesJson.map(mockQuote => {
+            let setSize = quoteSet.size;
+            const formattedQuote = formatQuote(mockQuote.text);
+            quoteSet.add(formattedQuote);
+            if(setSize === quoteSet.size) {
+                duplicateQuotes.push(mockQuote)
+            }
+        });
+
+        fs.writeFile('duplicates.json', JSON.stringify(duplicateQuotes), 'utf8', (err) => {
+            if (err) console.log(err)
+        });
+
+        expect(quoteSet.size).to.equal(inputQuotesJson.length);
+    })
+})