diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index b78e7f6..15b0fe0 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -65,6 +65,8 @@
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         "@tailwindcss/postcss": "^4.1.14",
+        "@testing-library/jest-dom": "^6.9.1",
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         "@types/node": "^24.6.0",
         "@types/react": "^19.1.16",
         "@types/react-dom": "^19.1.9",
@@ -74,11 +76,20 @@
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         "eslint-plugin-react-refresh": "^0.4.22",
         "globals": "^16.4.0",
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         "typescript": "~5.9.3",
         "typescript-eslint": "^8.45.0",
-        "vite": "npm:rolldown-vite@7.1.14"
+        "vite": "npm:rolldown-vite@7.1.14",
+        "vitest": "^4.0.4"
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+    "node_modules/@adobe/css-tools": {
+      "version": "4.4.4",
+      "resolved": "https://registry.npmjs.org/@adobe/css-tools/-/css-tools-4.4.4.tgz",
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+      "license": "MIT"
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       "resolved": "https://registry.npmjs.org/@alloc/quick-lru/-/quick-lru-5.2.0.tgz",
@@ -92,6 +103,61 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
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+    "node_modules/@asamuzakjp/css-color": {
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-4.0.5.tgz",
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+      "dev": true,
+      "license": "MIT",
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+        "@csstools/css-color-parser": "^3.1.0",
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+        "@csstools/css-tokenizer": "^3.0.4",
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+    "node_modules/@asamuzakjp/css-color/node_modules/lru-cache": {
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+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.2.2.tgz",
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+      "dev": true,
+      "license": "ISC",
+      "engines": {
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+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector": {
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+      "resolved": "https://registry.npmjs.org/@asamuzakjp/dom-selector/-/dom-selector-6.7.3.tgz",
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+      "license": "MIT",
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+    "node_modules/@asamuzakjp/dom-selector/node_modules/lru-cache": {
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+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.2.2.tgz",
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+      "dev": true,
+      "license": "ISC",
+      "engines": {
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+    "node_modules/@asamuzakjp/nwsapi": {
+      "version": "2.3.9",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/nwsapi/-/nwsapi-2.3.9.tgz",
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@@ -712,6 +778,144 @@
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+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-5.1.0.tgz",
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+      "dev": true,
+      "funding": [
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+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
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+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
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+      }
+    },
+    "node_modules/@csstools/css-calc": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-2.1.4.tgz",
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+      "dev": true,
+      "funding": [
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+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
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+        "@csstools/css-tokenizer": "^3.0.4"
+      }
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+    "node_modules/@csstools/css-color-parser": {
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+      "resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-3.1.0.tgz",
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+      "dev": true,
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+          "url": "https://github.com/sponsors/csstools"
+        },
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+          "url": "https://opencollective.com/csstools"
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+      "license": "MIT",
+      "dependencies": {
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+        "@csstools/css-calc": "^2.1.4"
+      },
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+        "@csstools/css-tokenizer": "^3.0.4"
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+      "dev": true,
+      "funding": [
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+          "url": "https://github.com/sponsors/csstools"
+        },
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+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
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+      "peerDependencies": {
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+      "resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.0.14.tgz",
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+      "dev": true,
+      "funding": [
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+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
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+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
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+      "peerDependencies": {
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+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-3.0.4.tgz",
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+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
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+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
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@@ -2860,6 +3064,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@standard-schema/spec": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@standard-schema/spec/-/spec-1.0.0.tgz",
+      "integrity": "sha512-m2bOd0f2RT9k8QJx1JN85cZYyH1RqFBdlwtkSlf4tBDYLCiiZnv1fIIwacK6cqwXavOydf0NPToMQgpKq+dVlA==",
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+      "license": "MIT"
+    },
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       "resolved": "https://registry.npmjs.org/@swc/core/-/core-1.13.5.tgz",
@@ -3616,6 +3827,120 @@
         "react": "^18 || ^19"
       }
     },
+    "node_modules/@testing-library/dom": {
+      "version": "10.4.1",
+      "resolved": "https://registry.npmjs.org/@testing-library/dom/-/dom-10.4.1.tgz",
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+      "license": "MIT",
+      "peer": true,
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+        "@babel/runtime": "^7.12.5",
+        "@types/aria-query": "^5.0.1",
+        "aria-query": "5.3.0",
+        "dom-accessibility-api": "^0.5.9",
+        "lz-string": "^1.5.0",
+        "picocolors": "1.1.1",
+        "pretty-format": "^27.0.2"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@testing-library/dom/node_modules/ansi-styles": {
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+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
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+      "license": "MIT",
+      "peer": true,
+      "engines": {
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+      "funding": {
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+        "aria-query": "^5.0.0",
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+        "npm": ">=6",
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+      "dev": true,
+      "license": "MIT"
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+    "node_modules/@testing-library/react": {
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+      "resolved": "https://registry.npmjs.org/@testing-library/react/-/react-16.3.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+      },
+      "engines": {
+        "node": ">=18"
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+      "peerDependencies": {
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+        "@types/react": "^18.0.0 || ^19.0.0",
+        "@types/react-dom": "^18.0.0 || ^19.0.0",
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0"
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+        "@types/react": {
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@@ -3705,6 +4030,14 @@
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@@ -3750,6 +4083,17 @@
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       "license": "MIT",
-      "bin": {
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+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vitest/node_modules/picomatch": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
+      "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/jonschlinkert"
+      }
+    },
+    "node_modules/w3c-xmlserializer": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
+      "integrity": "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-8.0.0.tgz",
+      "integrity": "sha512-n4W4YFyz5JzOfQeA8oN7dUYpR+MBP3PIUsn2jLjWXwK5ASUzt0Jc/A5sAUZoCYFJRGF0FBKJ+1JjN43rNdsQzA==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-encoding": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-3.1.1.tgz",
+      "integrity": "sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "iconv-lite": "0.6.3"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/whatwg-encoding/node_modules/iconv-lite": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
+      "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "safer-buffer": ">= 2.1.2 < 3.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/whatwg-mimetype": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-4.0.0.tgz",
+      "integrity": "sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "15.1.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-15.1.0.tgz",
+      "integrity": "sha512-2ytDk0kiEj/yu90JOAp44PVPUkO9+jVhyf+SybKlRHSDlvOOZhdPIrr7xTH64l4WixO2cP+wQIcgujkGBPPz6g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tr46": "^6.0.0",
+        "webidl-conversions": "^8.0.0"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -7391,6 +8483,23 @@
         "node": ">= 8"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/word-wrap": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
@@ -7401,6 +8510,45 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/ws": {
+      "version": "8.18.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.18.3.tgz",
+      "integrity": "sha512-PEIGCY5tSlUt50cqyMXfCzX+oOPqN0vuGqWzbcJ2xvnkzkq46oOpz7dQaTDBdfICb4N14+GARUDw2XV2N4tvzg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index 3561580..eca8891 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -7,7 +7,8 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "eslint .",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest"
   },
   "dependencies": {
     "@hookform/resolvers": "^3.10.0",
@@ -67,6 +68,8 @@
   "devDependencies": {
     "@eslint/js": "^9.36.0",
     "@tailwindcss/postcss": "^4.1.14",
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.0",
     "@types/node": "^24.6.0",
     "@types/react": "^19.1.16",
     "@types/react-dom": "^19.1.9",
@@ -76,9 +79,11 @@
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.22",
     "globals": "^16.4.0",
+    "jsdom": "^27.0.1",
     "typescript": "~5.9.3",
     "typescript-eslint": "^8.45.0",
-    "vite": "npm:rolldown-vite@7.1.14"
+    "vite": "npm:rolldown-vite@7.1.14",
+    "vitest": "^4.0.4"
   },
   "overrides": {
     "vite": "npm:rolldown-vite@7.1.14"
diff --git a/frontend/src/__tests__/Browse.test.tsx b/frontend/src/__tests__/Browse.test.tsx
new file mode 100644
index 0000000..8fbfbef
--- /dev/null
+++ b/frontend/src/__tests__/Browse.test.tsx
@@ -0,0 +1,114 @@
+import { render, screen, fireEvent } from "@testing-library/react";
+import { describe, it, expect, vi } from "vitest";
+import { MemoryRouter } from "react-router-dom";
+import Browse from "../pages/Browse";
+
+describe("Browse Component", () => {
+  beforeEach(() => {
+    vi.spyOn(window, "alert").mockImplementation(() => {}); // prevent alert popups
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it("renders the heading and product cards", () => {
+    render(
+      <MemoryRouter>
+        <Browse />
+      </MemoryRouter>
+    );
+
+    // Header
+    expect(screen.getByText(/Browse Products/i)).toBeInTheDocument();
+    expect(
+      screen.getByText(/Find what you need from fellow students/i)
+    ).toBeInTheDocument();
+
+    // Product cards visible
+    expect(screen.getByText("Desk Lamp")).toBeInTheDocument();
+    expect(screen.getByText("C++ Programming Book")).toBeInTheDocument();
+  });
+
+  it("filters products by search query", () => {
+    render(
+      <MemoryRouter>
+        <Browse />
+      </MemoryRouter>
+    );
+
+    const searchInput = screen.getByPlaceholderText(
+      /Search for textbooks, electronics, notes/i
+    );
+
+    // Type "lamp" in search bar
+    fireEvent.change(searchInput, { target: { value: "lamp" } });
+
+    // Only Desk Lamp should show
+    expect(screen.getByText("Desk Lamp")).toBeInTheDocument();
+    expect(screen.queryByText("Laptop Stand")).not.toBeInTheDocument();
+  });
+
+  it("opens and applies filter drawer", () => {
+    render(
+      <MemoryRouter>
+        <Browse />
+      </MemoryRouter>
+    );
+
+    // Click Filter button
+    const filterButton = screen.getByRole("button", { name: /Filter/i });
+    fireEvent.click(filterButton);
+
+    // Select Electronics category
+    const categorySelect = screen.getByLabelText(/Category/i);
+    fireEvent.change(categorySelect, { target: { value: "electronics" } });
+
+    // Apply filters
+    const applyBtn = screen.getByRole("button", { name: /Apply Filters/i });
+    fireEvent.click(applyBtn);
+
+    expect(window.alert).toHaveBeenCalledWith(
+      expect.stringContaining("Category: electronics")
+    );
+  });
+
+  it("clears filters when clicking 'Clear'", () => {
+    render(
+      <MemoryRouter>
+        <Browse />
+      </MemoryRouter>
+    );
+
+    const filterButton = screen.getByRole("button", { name: /Filter/i });
+    fireEvent.click(filterButton);
+
+    // Change category to "notes"
+    const categorySelect = screen.getByLabelText(/Category/i);
+    fireEvent.change(categorySelect, { target: { value: "notes" } });
+
+    // Click Clear
+    const clearButton = screen.getByRole("button", { name: /Clear/i });
+    fireEvent.click(clearButton);
+
+    expect(categorySelect).toHaveValue("");
+  });
+
+  it("triggers alert when 'Add to Cart' is clicked", () => {
+    render(
+      <MemoryRouter>
+        <Browse />
+      </MemoryRouter>
+    );
+
+    const addToCartButton = screen.getAllByRole("button", {
+      name: /Add to Cart/i,
+    })[0];
+
+    fireEvent.click(addToCartButton);
+
+    expect(window.alert).toHaveBeenCalledWith(
+      expect.stringContaining("added to cart")
+    );
+  });
+});
diff --git a/frontend/src/__tests__/Navbar.test.tsx b/frontend/src/__tests__/Navbar.test.tsx
new file mode 100644
index 0000000..5a3618b
--- /dev/null
+++ b/frontend/src/__tests__/Navbar.test.tsx
@@ -0,0 +1,58 @@
+import { render, screen, fireEvent } from "@testing-library/react";
+import { BrowserRouter } from "react-router-dom";
+import Navbar from "@/components/Navbar";
+
+// Helper to render with Router context
+const renderNavbar = () => render(
+  <BrowserRouter>
+    <Navbar />
+  </BrowserRouter>
+);
+
+describe("Navbar Component", () => {
+
+  beforeEach(() => {
+    localStorage.clear();
+    document.documentElement.classList.remove("dark");
+  });
+
+  it("renders brand name and nav links", () => {
+    renderNavbar();
+    expect(screen.getByText("UniLoot")).toBeInTheDocument();
+    expect(screen.getByText("Home")).toBeInTheDocument();
+    expect(screen.getByText("Browse")).toBeInTheDocument();
+    expect(screen.getByText("Sell")).toBeInTheDocument();
+  });
+
+  it("renders Sign In and Sign Up buttons", () => {
+    renderNavbar();
+    expect(screen.getByRole("button", { name: /sign in/i })).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: /sign up/i })).toBeInTheDocument();
+  });
+
+  it("toggles mobile menu visibility", () => {
+    renderNavbar();
+    const menuButton = screen.getByRole("button", { name: "" }); // the menu (hamburger) icon button
+    fireEvent.click(menuButton);
+    expect(screen.getByText("Home")).toBeVisible();
+    fireEvent.click(menuButton);
+    expect(screen.queryByText("Home")).toBeInTheDocument(); // still in DOM but hidden
+  });
+
+  it("toggles theme between light and dark", () => {
+    renderNavbar();
+    const themeButton = screen.getAllByRole("button").find(btn => btn.innerHTML.includes("svg"));
+    expect(document.documentElement.classList.contains("dark")).toBe(false);
+    fireEvent.click(themeButton!);
+    expect(document.documentElement.classList.contains("dark")).toBe(true);
+    fireEvent.click(themeButton!);
+    expect(document.documentElement.classList.contains("dark")).toBe(false);
+  });
+
+  it("stores theme preference in localStorage", () => {
+    renderNavbar();
+    const themeButton = screen.getAllByRole("button").find(btn => btn.innerHTML.includes("svg"));
+    fireEvent.click(themeButton!);
+    expect(localStorage.getItem("theme")).toBe("dark");
+  });
+});
diff --git a/frontend/src/__tests__/SignIn.test.tsx b/frontend/src/__tests__/SignIn.test.tsx
new file mode 100644
index 0000000..7e2aa29
--- /dev/null
+++ b/frontend/src/__tests__/SignIn.test.tsx
@@ -0,0 +1,122 @@
+import { render, screen, fireEvent, waitFor } from "@testing-library/react";
+import { vi } from "vitest";
+import SignIn from "../pages/Signin";
+import { BrowserRouter } from "react-router-dom";
+import { mockLogin } from "../lib/api";
+
+// Mock toast
+vi.mock("../hooks/use-toast", () => ({
+  toast: vi.fn(),
+}));
+
+// Mock the API
+vi.mock("../lib/api", async () => {
+  const actual = await vi.importActual("../lib/api");
+  return {
+    ...actual,
+    mockLogin: vi.fn(),
+  };
+});
+
+describe("SignIn Component", () => {
+  const renderWithRouter = () =>
+    render(
+      <BrowserRouter>
+        <SignIn />
+      </BrowserRouter>
+    );
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  test("renders all form fields", () => {
+    renderWithRouter();
+
+    expect(screen.getByLabelText(/email/i)).toBeInTheDocument();
+    expect(screen.getByLabelText(/password/i)).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: /sign in/i })).toBeInTheDocument();
+  });
+
+  test("shows validation errors for empty submission", async () => {
+    renderWithRouter();
+
+    fireEvent.click(screen.getByRole("button", { name: /sign in/i }));
+
+    await waitFor(() => {
+      expect(screen.getByText(/email is required/i)).toBeInTheDocument();
+      expect(screen.getByText(/password is required/i)).toBeInTheDocument();
+    });
+  });
+
+  test("shows error for invalid email", async () => {
+    renderWithRouter();
+
+    fireEvent.change(screen.getByLabelText(/email/i), {
+      target: { value: "invalidemail" },
+    });
+    fireEvent.change(screen.getByLabelText(/password/i), {
+      target: { value: "password123" },
+    });
+
+fireEvent.input(screen.getByLabelText(/email/i), {
+  target: { value: "invalid-email" },
+});
+fireEvent.input(screen.getByLabelText(/password/i), {
+  target: { value: "password123" },
+});
+fireEvent.submit(screen.getByRole("button", { name: /sign in/i }));
+
+// wait for react-hook-form to show validation message
+await screen.findByText(/invalid email address/i);
+
+  });
+
+  test("submits form successfully", async () => {
+    (mockLogin as vi.Mock).mockResolvedValueOnce({
+      success: true,
+      message: "Login successful!",
+      user: { email: "demo@peercall.com", id: "user-1" },
+    });
+
+    renderWithRouter();
+
+    fireEvent.change(screen.getByLabelText(/email/i), {
+      target: { value: "demo@peercall.com" },
+    });
+    fireEvent.change(screen.getByLabelText(/password/i), {
+      target: { value: "password123" },
+    });
+
+    fireEvent.click(screen.getByRole("button", { name: /sign in/i }));
+
+    await waitFor(() => {
+      expect(mockLogin).toHaveBeenCalledWith({
+        email: "demo@peercall.com",
+        password: "password123",
+      });
+    });
+  });
+
+  test("handles API error gracefully", async () => {
+    (mockLogin as vi.Mock).mockRejectedValueOnce({
+      success: false,
+      message: "Invalid credentials",
+    });
+
+    renderWithRouter();
+
+    fireEvent.change(screen.getByLabelText(/email/i), {
+      target: { value: "wrong@example.com" },
+    });
+    fireEvent.change(screen.getByLabelText(/password/i), {
+      target: { value: "wrongpass" },
+    });
+
+    fireEvent.click(screen.getByRole("button", { name: /sign in/i }));
+
+    await waitFor(() => {
+      expect(mockLogin).toHaveBeenCalled();
+    });
+  });
+});
diff --git a/frontend/src/__tests__/SignUp.test.tsx b/frontend/src/__tests__/SignUp.test.tsx
new file mode 100644
index 0000000..5c9cea9
--- /dev/null
+++ b/frontend/src/__tests__/SignUp.test.tsx
@@ -0,0 +1,110 @@
+import { render, screen, fireEvent, waitFor } from "@testing-library/react";
+import { vi } from "vitest";
+import SignUp from "../pages/Signup";
+import { mockRegister } from "../lib/api";
+import { BrowserRouter } from "react-router-dom";
+
+// mock toast to prevent errors
+vi.mock("../hooks/use-toast", () => ({
+  toast: vi.fn(),
+}));
+
+// mock API
+vi.mock("../lib/api", () => ({
+  mockRegister: vi.fn(),
+}));
+
+const renderWithRouter = (ui: React.ReactNode) => {
+  return render(<BrowserRouter>{ui}</BrowserRouter>);
+};
+
+describe("SignUp Component", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  test("renders all form fields", () => {
+    renderWithRouter(<SignUp />);
+
+    expect(screen.getByLabelText(/email/i)).toBeInTheDocument();
+    expect(screen.getByLabelText(/^password$/i)).toBeInTheDocument();
+    expect(screen.getByLabelText(/confirm password/i)).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: /sign up/i })).toBeInTheDocument();
+  });
+
+  test("shows validation errors for empty submission", async () => {
+    renderWithRouter(<SignUp />);
+
+    fireEvent.click(screen.getByRole("button", { name: /sign up/i }));
+
+    expect(await screen.findByText(/email is required/i)).toBeInTheDocument();
+    expect(await screen.findByText(/password is required/i)).toBeInTheDocument();
+    expect(await screen.findByText(/please confirm your password/i)).toBeInTheDocument();
+  });
+
+  test("shows password mismatch error", async () => {
+    renderWithRouter(<SignUp />);
+
+    fireEvent.change(screen.getByLabelText(/email/i), {
+      target: { value: "test@example.com" },
+    });
+    fireEvent.change(screen.getByLabelText(/^password$/i), {
+      target: { value: "123456" },
+    });
+    fireEvent.change(screen.getByLabelText(/confirm password/i), {
+      target: { value: "654321" },
+    });
+
+    fireEvent.click(screen.getByRole("button", { name: /sign up/i }));
+
+    expect(await screen.findByText(/passwords do not match/i)).toBeInTheDocument();
+  });
+
+  test("submits form successfully", async () => {
+    (mockRegister as any).mockResolvedValueOnce({ message: "Account created successfully" });
+
+    renderWithRouter(<SignUp />);
+
+    fireEvent.change(screen.getByLabelText(/email/i), {
+      target: { value: "user@example.com" },
+    });
+    fireEvent.change(screen.getByLabelText(/^password$/i), {
+      target: { value: "123456" },
+    });
+    fireEvent.change(screen.getByLabelText(/confirm password/i), {
+      target: { value: "123456" },
+    });
+
+    fireEvent.click(screen.getByRole("button", { name: /sign up/i }));
+
+    await waitFor(() => {
+      expect(mockRegister).toHaveBeenCalledWith({
+        email: "user@example.com",
+        password: "123456",
+        confirmPassword: "123456",
+      });
+    });
+  });
+
+  test("handles API error gracefully", async () => {
+    (mockRegister as any).mockRejectedValueOnce(new Error("Registration failed"));
+
+    renderWithRouter(<SignUp />);
+
+    fireEvent.change(screen.getByLabelText(/email/i), {
+      target: { value: "user@example.com" },
+    });
+    fireEvent.change(screen.getByLabelText(/^password$/i), {
+      target: { value: "123456" },
+    });
+    fireEvent.change(screen.getByLabelText(/confirm password/i), {
+      target: { value: "123456" },
+    });
+
+    fireEvent.click(screen.getByRole("button", { name: /sign up/i }));
+
+    await waitFor(() => {
+      expect(mockRegister).toHaveBeenCalled();
+    });
+  });
+});
diff --git a/frontend/src/components/Navbar.tsx b/frontend/src/components/Navbar.tsx
index b488e81..da7b11f 100644
--- a/frontend/src/components/Navbar.tsx
+++ b/frontend/src/components/Navbar.tsx
@@ -93,6 +93,7 @@ const Navbar: React.FC = () => {
         </div>
 
         <button
+          aria-label="Toggle menu"
           onClick={() => setIsOpen(!isOpen)}
           className="md:hidden text-blue-800 dark:text-blue-300 focus:outline-none"
         >
diff --git a/frontend/src/pages/Browse.tsx b/frontend/src/pages/Browse.tsx
index 7ada4e4..c8f5b33 100644
--- a/frontend/src/pages/Browse.tsx
+++ b/frontend/src/pages/Browse.tsx
@@ -223,10 +223,11 @@ const Browse = () => {
 
               {/* Category */}
               <div className="mt-4">
-                <label className="block text-gray-700 mb-2 font-medium">
+                <label htmlFor="category" className="block text-gray-700 mb-2 font-medium">
                   Category
                 </label>
                 <select
+                  id="category"
                   className="w-full border-2 border-blue-200 rounded-lg p-3 focus:outline-none focus:border-blue-500"
                   value={selectedCategory}
                   onChange={(e) => setSelectedCategory(e.target.value)}
diff --git a/frontend/src/setupTests.ts b/frontend/src/setupTests.ts
new file mode 100644
index 0000000..8fc362f
--- /dev/null
+++ b/frontend/src/setupTests.ts
@@ -0,0 +1,16 @@
+import "@testing-library/jest-dom";
+
+// ✅ Use vi instead of jest (for Vitest)
+Object.defineProperty(window, "matchMedia", {
+  writable: true,
+  value: vi.fn().mockImplementation((query) => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: vi.fn(), // deprecated
+    removeListener: vi.fn(),
+    addEventListener: vi.fn(),
+    removeEventListener: vi.fn(),
+    dispatchEvent: vi.fn(),
+  })),
+});
diff --git a/frontend/tsconfig.app.json b/frontend/tsconfig.app.json
index 0b0e43e..1477e1f 100644
--- a/frontend/tsconfig.app.json
+++ b/frontend/tsconfig.app.json
@@ -5,6 +5,7 @@
     "lib": ["ES2020", "DOM", "DOM.Iterable"],
     "module": "ESNext",
     "skipLibCheck": true,
+    "types": ["vitest", "node"],
 
     /* Bundler mode */
     "moduleResolution": "bundler",
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index f245a67..c9a752d 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -1,4 +1,4 @@
-import { defineConfig } from "vite";
+import { defineConfig } from "vitest/config";
 import react from "@vitejs/plugin-react-swc";
 import path from "path";
 
@@ -13,4 +13,9 @@ export default defineConfig({
       "@": path.resolve(__dirname, "./src"),
     },
   },
+    test: {
+    globals: true,
+    environment: "jsdom",
+    setupFiles: "./src/setupTests.ts",
+  },
 });