diff --git a/package-lock.json b/package-lock.json
index b87384e..6c6067b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,6 +15,9 @@
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         "@rolldown/plugin-babel": "^0.2.3",
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@@ -25,6 +28,7 @@
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         "globals": "^17.11.0",
+        "jsdom": "^29.1.1",
         "prettier": "^3.9.6",
         "typescript": "~6.0.2",
         "typescript-eslint": "^8.67.0",
@@ -36,6 +40,64 @@
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+      "resolved": "https://registry.npmjs.org/@adobe/css-tools/-/css-tools-4.5.0.tgz",
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+      "dev": true,
+      "license": "MIT"
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+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-5.1.11.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+        "@csstools/css-parser-algorithms": "^4.0.0",
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+      "resolved": "https://registry.npmjs.org/@asamuzakjp/dom-selector/-/dom-selector-7.1.1.tgz",
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+      "license": "MIT",
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+      "resolved": "https://registry.npmjs.org/@asamuzakjp/generational-cache/-/generational-cache-1.0.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
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+    },
+    "node_modules/@asamuzakjp/nwsapi": {
+      "version": "2.3.9",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/nwsapi/-/nwsapi-2.3.9.tgz",
+      "integrity": "sha512-n8GuYSrI9bF7FFZ/SjhwevlHc8xaVlb/7HmHelnc/PZXBD2ZR49NnN9sMMuDdEGPeeRQ5d0hqlSlEpgCX3Wl0Q==",
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+      "license": "MIT"
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       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.7.tgz",
@@ -228,6 +290,16 @@
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+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.29.7.tgz",
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+      "license": "MIT",
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       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.29.7.tgz",
@@ -276,6 +348,159 @@
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+      "license": "MIT",
+      "dependencies": {
+        "css-tree": "^3.0.0"
+      },
+      "bin": {
+        "specificity": "bin/cli.js"
+      }
+    },
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+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-6.1.1.tgz",
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+      "funding": [
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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-0",
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+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-3.3.0.tgz",
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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",
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+          "url": "https://github.com/sponsors/csstools"
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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"
+        }
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+      "license": "MIT-0",
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+      },
+      "peerDependenciesMeta": {
+        "css-tree": {
+          "optional": true
+        }
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+    },
+    "node_modules/@csstools/css-tokenizer": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-4.0.0.tgz",
+      "integrity": "sha512-QxULHAm7cNu72w97JUNCBFODFaXpbDg+dP8b/oWFAZ2MTRppA3U00Y2L1HqaS4J6yBqxwa/Y3nMBaxVKbB/NsA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
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     "node_modules/@eslint-community/eslint-utils": {
       "version": "4.10.1",
       "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.10.1.tgz",
@@ -404,6 +629,24 @@
         "node": "^20.19.0 || ^22.13.0 || >=24"
       }
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+    "node_modules/@exodus/bytes": {
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+      "resolved": "https://registry.npmjs.org/@exodus/bytes/-/bytes-1.15.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      },
+      "peerDependencies": {
+        "@noble/hashes": "^1.8.0 || ^2.0.0"
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+        "@noble/hashes": {
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       "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.2.tgz",
@@ -856,6 +1099,97 @@
         "react": "^18 || ^19"
       }
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+    "node_modules/@testing-library/dom": {
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+      "resolved": "https://registry.npmjs.org/@testing-library/dom/-/dom-10.4.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+        "@babel/runtime": "^7.12.5",
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+        "lz-string": "^1.5.0",
+        "picocolors": "1.1.1",
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+      },
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+      "license": "MIT",
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+        "aria-query": "^5.0.0",
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+        "picocolors": "^1.1.1",
+        "redent": "^3.0.0"
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+        "npm": ">=6",
+        "yarn": ">=1"
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+        "vitest": ">= 0.32"
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+      "license": "MIT"
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+      "license": "MIT",
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+      },
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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": {
+          "optional": true
+        },
+        "@types/react-dom": {
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+      "dev": true,
+      "license": "MIT"
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       "resolved": "https://registry.npmjs.org/@types/chai/-/chai-5.2.3.tgz",
@@ -1351,6 +1685,39 @@
         "url": "https://github.com/sponsors/epoberezkin"
       }
     },
+    "node_modules/ansi-regex": {
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+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
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+      "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-5.3.0.tgz",
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+      "dev": true,
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@@ -1394,6 +1761,16 @@
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+      "license": "MIT",
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@@ -1494,6 +1871,27 @@
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+      "license": "MIT",
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+      "resolved": "https://registry.npmjs.org/css.escape/-/css.escape-1.5.1.tgz",
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+      "license": "MIT"
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@@ -1501,6 +1899,20 @@
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+      "license": "MIT",
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     },
+    "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/package.json b/package.json
index 3d09b71..dc7a016 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,8 @@
     "lint": "eslint .",
     "preview": "vite preview",
     "format": "prettier --write .",
-    "format:check": "prettier --check ."
+    "format:check": "prettier --check .",
+    "test": "vitest"
   },
   "dependencies": {
     "@tanstack/react-query": "^5.102.8",
@@ -19,6 +20,9 @@
   "devDependencies": {
     "@eslint/js": "^10.0.1",
     "@rolldown/plugin-babel": "^0.2.3",
+    "@testing-library/dom": "^10.4.1",
+    "@testing-library/jest-dom": "^7.0.1",
+    "@testing-library/react": "^16.3.3",
     "@types/node": "^24.13.3",
     "@types/react": "^19.2.18",
     "@types/react-dom": "^19.2.4",
@@ -29,6 +33,7 @@
     "eslint-plugin-react-hooks": "^7.1.1",
     "eslint-plugin-react-refresh": "^0.5.4",
     "globals": "^17.11.0",
+    "jsdom": "^29.1.1",
     "prettier": "^3.9.6",
     "typescript": "~6.0.2",
     "typescript-eslint": "^8.67.0",
diff --git a/src/test/setup.test.tsx b/src/test/setup.test.tsx
new file mode 100644
index 0000000..f42ff00
--- /dev/null
+++ b/src/test/setup.test.tsx
@@ -0,0 +1,16 @@
+import { render, screen } from '@testing-library/react'
+import { describe, expect, it } from 'vitest'
+
+function TestComponent() {
+  return <h1>Testing fungerer</h1>
+}
+
+describe('Testoppsett', () => {
+  it('kan rendre en React-komponent', () => {
+    render(<TestComponent />)
+
+    expect(screen.getByRole('heading')).toHaveTextContent(
+      'Testing fungerer',
+    )
+  })
+})
\ No newline at end of file
diff --git a/src/test/setup.ts b/src/test/setup.ts
new file mode 100644
index 0000000..e8ee517
--- /dev/null
+++ b/src/test/setup.ts
@@ -0,0 +1 @@
+import '@testing-library/jest-dom/vitest'
\ No newline at end of file
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..1dc89eb
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,8 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  test: {
+    environment: 'jsdom',
+    setupFiles: ['./src/test/setup.ts'],
+  },
+})