diff --git a/eslint.config.mjs b/eslint.config.mjs
index 62bebdf34..df45beba9 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -1,3 +1,4 @@
+import fs from "fs";
 import path from "path";
 import { fileURLToPath } from "url";
 
@@ -25,6 +26,17 @@ const compat = new FlatCompat({
     allConfig: js.configs.all,
 });
 
+const packageDirs = [__dirname];
+const packagesRoot = path.join(__dirname, "packages");
+if (fs.existsSync(packagesRoot)) {
+    fs.readdirSync(packagesRoot).forEach((dir) => {
+        const pkgPath = path.join(packagesRoot, dir, "package.json");
+        if (fs.existsSync(pkgPath)) {
+            packageDirs.push(path.join(packagesRoot, dir));
+        }
+    });
+}
+
 export default defineConfig([
     ...compat.extends(
         "eslint:recommended",
@@ -89,7 +101,13 @@ export default defineConfig([
             "n/hashbang": "warn",
 
             // *************** Ensure that only used dependencies are imported ***************
-            "extraneous-dependencies/no-extraneous-dependencies": "off", // https://github.com/eclipse-thingweb/node-wot/issues/1430
+            // Default rule for root files
+            "extraneous-dependencies/no-extraneous-dependencies": [
+                "warn",
+                {
+                    packageDir: [__dirname],
+                },
+            ],
 
             // *************** Code style and best practices ***************
             "unused-imports/no-unused-imports": "error",
@@ -157,4 +175,17 @@ export default defineConfig([
         "**/bin",
         "**/*.js",
     ]),
+    ...packageDirs
+        .filter((dir) => dir !== __dirname)
+        .map((dir) => ({
+            files: [path.relative(__dirname, dir) + "/**/*.{ts,js}"],
+            rules: {
+                "extraneous-dependencies/no-extraneous-dependencies": [
+                    "warn",
+                    {
+                        packageDir: [__dirname, dir],
+                    },
+                ],
+            },
+        })),
 ]);
diff --git a/package-lock.json b/package-lock.json
index f2f111f1f..be4a1195d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12179,6 +12179,10 @@
                 "rxjs": "^5.5.11",
                 "slugify": "^1.4.5",
                 "wot-typescript-definitions": "0.8.0-SNAPSHOT.31"
+            },
+            "devDependencies": {
+                "@testdeck/mocha": "^0.1.2",
+                "chai": "^4.3.4"
             }
         },
         "packages/binding-file": {
@@ -12188,6 +12192,9 @@
             "dependencies": {
                 "@node-wot/core": "0.9.2",
                 "rxjs": "^5.5.11"
+            },
+            "devDependencies": {
+                "chai": "^4.3.4"
             }
         },
         "packages/binding-http": {
@@ -12209,13 +12216,19 @@
             "devDependencies": {
                 "@node-oauth/express-oauth-server": "^3.0.1",
                 "@node-oauth/oauth2-server": "^4.3.0",
+                "@sinonjs/fake-timers": "^7.1.2",
+                "@testdeck/mocha": "^0.1.2",
                 "@types/accept-language-parser": "^1.5.2",
                 "@types/basic-auth": "1.1.3",
                 "@types/eventsource": "^1.1.15",
                 "@types/express": "^4.17.3",
                 "@types/node-fetch": "^2.6.12",
                 "body-parser": "^1.20.3",
+                "chai": "^4.3.4",
+                "chai-as-promised": "^7.1.1",
+                "chai-spies": "^1.0.0",
                 "express": "^4.20.0",
+                "serve-static": "^1.16.2",
                 "ssestream": "^1.1.0",
                 "timekeeper": "^2.2.0"
             }
@@ -12228,6 +12241,10 @@
                 "@node-wot/core": "0.9.2",
                 "node-mbus": "^2.2.6",
                 "rxjs": "^5.5.11"
+            },
+            "devDependencies": {
+                "chai": "^4.3.4",
+                "chai-as-promised": "^7.1.1"
             }
         },
         "packages/binding-modbus": {
@@ -12239,6 +12256,10 @@
                 "modbus-serial": "8.0.17",
                 "rxjs": "^5.5.11",
                 "wot-typescript-definitions": "0.8.0-SNAPSHOT.31"
+            },
+            "devDependencies": {
+                "chai": "^4.3.4",
+                "chai-as-promised": "^7.1.1"
             }
         },
         "packages/binding-mqtt": {
@@ -12250,6 +12271,10 @@
                 "aedes": "^0.46.2",
                 "mqtt": "^5.3.2",
                 "rxjs": "^5.5.11"
+            },
+            "devDependencies": {
+                "chai": "^4.3.4",
+                "chai-as-promised": "^7.1.1"
             }
         },
         "packages/binding-netconf": {
@@ -12265,7 +12290,9 @@
             },
             "devDependencies": {
                 "@types/node-netconf": "npm:@types/netconf@^2.0.0",
-                "@types/url-parse": "^1.4.3"
+                "@types/url-parse": "^1.4.3",
+                "chai": "^4.3.4",
+                "chai-spies": "^1.0.0"
             }
         },
         "packages/binding-opcua": {
@@ -12333,6 +12360,10 @@
                 "rxjs": "^5.5.11",
                 "slugify": "^1.4.5",
                 "ws": "^7.5.10"
+            },
+            "devDependencies": {
+                "@testdeck/mocha": "^0.1.2",
+                "chai": "^4.3.4"
             }
         },
         "packages/browser-bundle": {
@@ -12495,7 +12526,9 @@
                 "wot-servient": "bin/index.js"
             },
             "devDependencies": {
-                "@types/lodash": "^4.14.199"
+                "@testdeck/mocha": "^0.1.2",
+                "@types/lodash": "^4.14.199",
+                "chai": "^4.3.4"
             },
             "optionalDependencies": {
                 "ts-node": "10.9.1"
@@ -12522,10 +12555,18 @@
                 "wot-thing-description-types": "^1.1.0-12-March-2025"
             },
             "devDependencies": {
+                "@testdeck/mocha": "^0.1.2",
+                "@types/chai": "^4.2.18",
+                "@types/chai-as-promised": "^7.1.4",
+                "@types/chai-spies": "^1.0.4",
                 "@types/content-type": "^1.1.8",
                 "@types/debug": "^4.1.7",
+                "@types/mocha": "^10.0.10",
                 "@types/uritemplate": "^0.3.4",
-                "@types/uuid": "^8.3.1"
+                "@types/uuid": "^8.3.1",
+                "chai": "^4.3.4",
+                "chai-as-promised": "^7.1.1",
+                "chai-spies": "^1.0.0"
             }
         },
         "packages/core/node_modules/ajv-formats": {
diff --git a/packages/binding-http/package.json b/packages/binding-http/package.json
index bc89e0b40..ce3f3701b 100644
--- a/packages/binding-http/package.json
+++ b/packages/binding-http/package.json
@@ -28,7 +28,9 @@
         "body-parser": "^1.20.3",
         "express": "^4.20.0",
         "ssestream": "^1.1.0",
-        "timekeeper": "^2.2.0"
+        "timekeeper": "^2.2.0",
+        "serve-static": "^1.16.2",
+        "@sinonjs/fake-timers": "^7.1.2"
     },
     "dependencies": {
         "@node-wot/core": "0.9.2",
diff --git a/packages/binding-opcua/package.json b/packages/binding-opcua/package.json
index 7ec0a8c60..c2271f923 100644
--- a/packages/binding-opcua/package.json
+++ b/packages/binding-opcua/package.json
@@ -15,8 +15,7 @@
     "main": "dist/index.js",
     "types": "dist/index.d.ts",
     "devDependencies": {
-        "should": "^13.2.3",
-        "chai": "^4.3.4"
+        "should": "^13.2.3"
     },
     "dependencies": {
         "@node-wot/core": "0.9.2",