diff --git a/lib/rules/no-duplicate-html-in-url.spec.js b/lib/rules/no-duplicate-html-in-url.spec.js
new file mode 100644
index 0000000..c3d86fb
--- /dev/null
+++ b/lib/rules/no-duplicate-html-in-url.spec.js
@@ -0,0 +1,45 @@
+// import { expect } from 'chai'
+const {expect} = require('chai') 
+// import rules from './index'
+const rules = require('./index')
+
+const httpRule = rules['no-duplicate-http-in-urls']
+const reports = []
+const fakeContext = {
+    report: ({ location, message }) => {
+        console.log(`Error Report`)
+        reports.push({location, message})
+    }
+}
+
+describe('', () => {
+    const fakeFlowConfig = {}
+    it('should report not report error if no nodes', () => {
+        // Arrange
+        const nodes = []
+        const createdFunction = httpRule.create(fakeContext, fakeFlowConfig)
+        // Act 
+        createdFunction.start(fakeFlowConfig)
+        nodes.forEach(node => createdFunction["type:http in"](node))
+        createdFunction.end(fakeFlowConfig)
+        // Assert
+        expect(reports.length).to.equal(0)
+    })
+    it('should report warning if two duplicate nodes', () => {
+        // Arrange
+        const nodeWithUrl = {
+            config: {
+                method: "GET",
+                url: "http://nodered.org"
+            }
+        }
+        const nodes = [{id:1, ...nodeWithUrl},{id:2, ...nodeWithUrl}]
+        const createdFunction = httpRule.create(fakeContext, fakeFlowConfig)
+        // Act 
+        createdFunction.start(fakeFlowConfig)
+        nodes.forEach(node => createdFunction["type:http in"](node))
+        createdFunction.end(fakeFlowConfig)
+        // Assert
+        expect(reports.length).to.equal(1)
+    })
+})
\ No newline at end of file
diff --git a/package.json b/package.json
index ee15ccc..1c8a552 100644
--- a/package.json
+++ b/package.json
@@ -37,10 +37,14 @@
             "nrlint-rules-eslint": "dist/nrlint-rules-function-eslint.html"
         }
     },
+    "mocha": {
+        "spec": ["lib/rules/*.spec.js"]
+    },
     "devDependencies": {
         "chai": "*",
         "fs-extra": "^10.0.0",
         "html-minifier": "^4.0.0",
+        "mocha": "^9.1.3",
         "webpack": "^5.37.1",
         "webpack-cli": "^4.7.0"
     },