diff --git a/.eslintrc.json b/.eslintrc.json
index f53acda..4a58526 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -11,7 +11,7 @@
     "plugin:import/recommended",
     "plugin:import/electron",
     "plugin:import/typescript",
-    "plugin:import/prettier"
+    "prettier"
   ],
   "plugins": ["@typescript-eslint"],
   "settings": {
diff --git a/.github/workflows/checks.yaml b/.github/workflows/checks.yaml
new file mode 100644
index 0000000..49d1f7a
--- /dev/null
+++ b/.github/workflows/checks.yaml
@@ -0,0 +1,29 @@
+name: Checks
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+      - edited
+
+jobs:
+  checks:
+    name: Checks
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - name: Install node dependencies
+        run: npm ci
+      - name: Lint
+        run: npm run lint
+      - name: Test
+        run: npm run test
diff --git a/package-lock.json b/package-lock.json
index 3bb25e5..9898cc8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "timetrack",
-  "version": "3.4.0",
+  "version": "3.5.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "timetrack",
-      "version": "3.4.0",
+      "version": "3.5.0",
       "license": "MIT",
       "dependencies": {
         "@fortawesome/fontawesome-free": "6.5.2",
@@ -58,7 +58,8 @@
         "typescript": "4.5.4",
         "vite": "5.2.11",
         "vite-plugin-static-copy": "1.0.4",
-        "vite-tsconfig-paths": "4.3.2"
+        "vite-tsconfig-paths": "4.3.2",
+        "vitest": "1.6.0"
       }
     },
     "node_modules/@ampproject/remapping": {
@@ -2808,6 +2809,18 @@
         "url": "https://github.com/chalk/strip-ansi?sponsor=1"
       }
     },
+    "node_modules/@jest/schemas": {
+      "version": "29.6.3",
+      "resolved": "https://registry.npmjs.org/@jest/schemas/-/schemas-29.6.3.tgz",
+      "integrity": "sha512-mo5j5X+jIZmJQveBKeS/clAueipV7KgiX1vMgCxam1RNYiqE1w62n0/tJJnHtjW8ZHcQco5gY85jA3mi0L+nSA==",
+      "dev": true,
+      "dependencies": {
+        "@sinclair/typebox": "^0.27.8"
+      },
+      "engines": {
+        "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.5",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.5.tgz",
@@ -4054,6 +4067,12 @@
         "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
       }
     },
+    "node_modules/@sinclair/typebox": {
+      "version": "0.27.8",
+      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.8.tgz",
+      "integrity": "sha512-+Fj43pSMwJs4KRrH/938Uf+uAELIgVBmQzg/q1YG10djyfA3TnrU8N8XzqCh/okZdszqBQTZf96idMfE5lnwTA==",
+      "dev": true
+    },
     "node_modules/@sindresorhus/is": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-4.6.0.tgz",
@@ -4634,6 +4653,102 @@
         "vite": "^4.2.0 || ^5.0.0"
       }
     },
+    "node_modules/@vitest/expect": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-1.6.0.tgz",
+      "integrity": "sha512-ixEvFVQjycy/oNgHjqsL6AZCDduC+tflRluaHIzKIsdbzkLn2U/iBnVeJwB6HsIjQBdfMR8Z0tRxKUsvFJEeWQ==",
+      "dev": true,
+      "dependencies": {
+        "@vitest/spy": "1.6.0",
+        "@vitest/utils": "1.6.0",
+        "chai": "^4.3.10"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/@vitest/runner": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@vitest/runner/-/runner-1.6.0.tgz",
+      "integrity": "sha512-P4xgwPjwesuBiHisAVz/LSSZtDjOTPYZVmNAnpHHSR6ONrf8eCJOFRvUwdHn30F5M1fxhqtl7QZQUk2dprIXAg==",
+      "dev": true,
+      "dependencies": {
+        "@vitest/utils": "1.6.0",
+        "p-limit": "^5.0.0",
+        "pathe": "^1.1.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/@vitest/runner/node_modules/p-limit": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-5.0.0.tgz",
+      "integrity": "sha512-/Eaoq+QyLSiXQ4lyYV23f14mZRQcXnxfHrN0vCai+ak9G0pp9iEQukIIZq5NccEvwRB8PUnZT0KsOoDCINS1qQ==",
+      "dev": true,
+      "dependencies": {
+        "yocto-queue": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/@vitest/runner/node_modules/yocto-queue": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-1.0.0.tgz",
+      "integrity": "sha512-9bnSc/HEW2uRy67wc+T8UwauLuPJVn28jb+GtJY16iiKWyvmYJRXVT4UamsAEGQfPohgr2q4Tq0sQbQlxTfi1g==",
+      "dev": true,
+      "engines": {
+        "node": ">=12.20"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/@vitest/snapshot": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@vitest/snapshot/-/snapshot-1.6.0.tgz",
+      "integrity": "sha512-+Hx43f8Chus+DCmygqqfetcAZrDJwvTj0ymqjQq4CvmpKFSTVteEOBzCusu1x2tt4OJcvBflyHUE0DZSLgEMtQ==",
+      "dev": true,
+      "dependencies": {
+        "magic-string": "^0.30.5",
+        "pathe": "^1.1.1",
+        "pretty-format": "^29.7.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/@vitest/spy": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@vitest/spy/-/spy-1.6.0.tgz",
+      "integrity": "sha512-leUTap6B/cqi/bQkXUu6bQV5TZPx7pmMBKBQiI0rJA8c3pB56ZsaTbREnF7CJfmvAS4V2cXIBAh/3rVwrrCYgw==",
+      "dev": true,
+      "dependencies": {
+        "tinyspy": "^2.2.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/@vitest/utils": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@vitest/utils/-/utils-1.6.0.tgz",
+      "integrity": "sha512-21cPiuGMoMZwiOHa2i4LXkMkMkCGzA+MVFV70jRwHo95dL4x/ts5GZhML1QWuy7yfp3WzK3lRvZi3JnXTYqrBw==",
+      "dev": true,
+      "dependencies": {
+        "diff-sequences": "^29.6.3",
+        "estree-walker": "^3.0.3",
+        "loupe": "^2.3.7",
+        "pretty-format": "^29.7.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
     "node_modules/@xmldom/xmldom": {
       "version": "0.8.10",
       "resolved": "https://registry.npmjs.org/@xmldom/xmldom/-/xmldom-0.8.10.tgz",
@@ -5047,6 +5162,15 @@
         "node": ">= 6"
       }
     },
+    "node_modules/assertion-error": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
+      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
+      "dev": true,
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/async": {
       "version": "1.5.2",
       "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
@@ -5386,6 +5510,15 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/cac": {
+      "version": "6.7.14",
+      "resolved": "https://registry.npmjs.org/cac/-/cac-6.7.14.tgz",
+      "integrity": "sha512-b6Ilus+c3RrdDk+JhLKUAQfzzgLEPy6wcXqS7f/xe1EETvsDP6GORG7SFuOs6cID5YkqchW/LXZbX5bc8j7ZcQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/cacache": {
       "version": "15.3.0",
       "resolved": "https://registry.npmjs.org/cacache/-/cacache-15.3.0.tgz",
@@ -5508,6 +5641,24 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/chai": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.4.1.tgz",
+      "integrity": "sha512-13sOfMv2+DWduEU+/xbun3LScLoqN17nBeTLUsmDfKdoiC1fr0n9PU4guu4AhRcOVFk/sW8LyZWHuhWtQZiF+g==",
+      "dev": true,
+      "dependencies": {
+        "assertion-error": "^1.1.0",
+        "check-error": "^1.0.3",
+        "deep-eql": "^4.1.3",
+        "get-func-name": "^2.0.2",
+        "loupe": "^2.3.6",
+        "pathval": "^1.1.1",
+        "type-detect": "^4.0.8"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/chainsaw": {
       "version": "0.0.9",
       "resolved": "https://registry.npmjs.org/chainsaw/-/chainsaw-0.0.9.tgz",
@@ -5571,6 +5722,18 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/check-error": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.3.tgz",
+      "integrity": "sha512-iKEoDYaRmd1mxM90a2OEfWhjsjPpYPuQ+lMYsoxB126+t8fw7ySEO48nmDg5COTjxDI65/Y2OWpeEHk3ZOe8zg==",
+      "dev": true,
+      "dependencies": {
+        "get-func-name": "^2.0.2"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/chokidar": {
       "version": "3.6.0",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.6.0.tgz",
@@ -5879,6 +6042,12 @@
       "integrity": "sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==",
       "devOptional": true
     },
+    "node_modules/confbox": {
+      "version": "0.1.7",
+      "resolved": "https://registry.npmjs.org/confbox/-/confbox-0.1.7.tgz",
+      "integrity": "sha512-uJcB/FKZtBMCJpK8MQji6bJHgu1tixKPxRLeGkNzBoOZzpnZUJm0jm2/sBDWcuBx1dYgxV4JU+g5hmNxCyAmdA==",
+      "dev": true
+    },
     "node_modules/config-chain": {
       "version": "1.1.13",
       "resolved": "https://registry.npmjs.org/config-chain/-/config-chain-1.1.13.tgz",
@@ -6232,6 +6401,18 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/deep-eql": {
+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-4.1.3.tgz",
+      "integrity": "sha512-WaEtAOpRA1MQ0eohqZjpGD8zdI0Ovsm8mmFhaDN8dvDZzyoUMcYDnf5Y6iu7HTXxf8JDS23qWa4a+hKCDyOPzw==",
+      "dev": true,
+      "dependencies": {
+        "type-detect": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/deep-extend": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
@@ -6370,6 +6551,15 @@
         "node": ">=0.3.1"
       }
     },
+    "node_modules/diff-sequences": {
+      "version": "29.6.3",
+      "resolved": "https://registry.npmjs.org/diff-sequences/-/diff-sequences-29.6.3.tgz",
+      "integrity": "sha512-EjePK1srD3P08o2j4f0ExnylqRs5B9tJjcp9t1krH2qRi8CCdsYfwe9JgSLurFBWwq4uOlipzfk5fHNvwFKr8Q==",
+      "dev": true,
+      "engines": {
+        "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
+      }
+    },
     "node_modules/dir-compare": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/dir-compare/-/dir-compare-4.2.0.tgz",
@@ -7907,6 +8097,15 @@
         "url": "https://opencollective.com/unified"
       }
     },
+    "node_modules/estree-walker": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-3.0.3.tgz",
+      "integrity": "sha512-7RUKfXgSMMkzt6ZuXmqapOurLGPPfgj6l9uRZ7lRGolvk0y2yocc35LdcxKC5PQZdn2DMqioAQ2NoWcrTKmm6g==",
+      "dev": true,
+      "dependencies": {
+        "@types/estree": "^1.0.0"
+      }
+    },
     "node_modules/esutils": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.3.tgz",
@@ -8712,6 +8911,15 @@
         "get-folder-size": "bin/get-folder-size"
       }
     },
+    "node_modules/get-func-name": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.2.tgz",
+      "integrity": "sha512-8vXOvuE167CtIc3OyItco7N/dpRtBbYOsPsXCz7X/PMnlGjYjSGuZJgM1Y7mmew7BKf9BqvLX2tnOVy1BBUsxQ==",
+      "dev": true,
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/get-installed-path": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/get-installed-path/-/get-installed-path-2.1.1.tgz",
@@ -9341,6 +9549,15 @@
         "node": ">= 6"
       }
     },
+    "node_modules/human-signals": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/human-signals/-/human-signals-5.0.0.tgz",
+      "integrity": "sha512-AXcZb6vzzrFAUE61HnN4mpLqd/cSIwNQjtNWR0euPm6y0iqx3G4gOXaIDdtdDwZmhwe82LA6+zinmW4UBWVePQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=16.17.0"
+      }
+    },
     "node_modules/humanize-ms": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/humanize-ms/-/humanize-ms-1.2.1.tgz",
@@ -10335,6 +10552,22 @@
         "node": ">=4"
       }
     },
+    "node_modules/local-pkg": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/local-pkg/-/local-pkg-0.5.0.tgz",
+      "integrity": "sha512-ok6z3qlYyCDS4ZEU27HaU6x/xZa9Whf8jD4ptH5UZTQYZVYeb9bnZ3ojVhiJNLiXK1Hfc0GNbLXcmZ5plLDDBg==",
+      "dev": true,
+      "dependencies": {
+        "mlly": "^1.4.2",
+        "pkg-types": "^1.0.3"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
     "node_modules/locate-path": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-6.0.0.tgz",
@@ -10450,6 +10683,15 @@
         "loose-envify": "cli.js"
       }
     },
+    "node_modules/loupe": {
+      "version": "2.3.7",
+      "resolved": "https://registry.npmjs.org/loupe/-/loupe-2.3.7.tgz",
+      "integrity": "sha512-zSMINGVYkdpYSOBmLi0D1Uo7JU9nVdQKrHxC8eYlV+9YKK9WePqAlL7lSlorG/U2Fw1w0hTBmaa/jrQ3UbPHtA==",
+      "dev": true,
+      "dependencies": {
+        "get-func-name": "^2.0.1"
+      }
+    },
     "node_modules/lowercase-keys": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/lowercase-keys/-/lowercase-keys-2.0.0.tgz",
@@ -10485,6 +10727,15 @@
         "nan": "^2.4.0"
       }
     },
+    "node_modules/magic-string": {
+      "version": "0.30.10",
+      "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.10.tgz",
+      "integrity": "sha512-iIRwTIf0QKV3UAnYK4PU8uiEc4SRh5jX0mwpIwETPpHdhVM4f53RSwS/vXvN1JhGX+Cs7B8qIq3d6AH49O5fAQ==",
+      "dev": true,
+      "dependencies": {
+        "@jridgewell/sourcemap-codec": "^1.4.15"
+      }
+    },
     "node_modules/make-dir": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-3.1.0.tgz",
@@ -10880,6 +11131,12 @@
       "integrity": "sha512-cCi6g3/Zr1iqQi6ySbseM1Xvooa98N0w31jzUYrXPX2xqObmFGHJ0tQ5u74H3mVh7wLouTseZyYIq39g8cNp1w==",
       "dev": true
     },
+    "node_modules/merge-stream": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/merge-stream/-/merge-stream-2.0.0.tgz",
+      "integrity": "sha512-abv/qOcuPfk3URPfDzmZU1LKmuw8kT+0nIHvKrKgFrwifol/doWcdA4ZqsWQ8ENrFKkd67Mfpo/LovbIUsbt3w==",
+      "dev": true
+    },
     "node_modules/merge2": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/merge2/-/merge2-1.4.1.tgz",
@@ -11640,6 +11897,18 @@
       "resolved": "https://registry.npmjs.org/mkdirp-classic/-/mkdirp-classic-0.5.3.tgz",
       "integrity": "sha512-gKLcREMhtuZRwRAfqP3RFW+TK4JqApVBtOIftVgjuABpAtpxhPGaDcfvbhNvD0B8iD1oUr/txX35NjcaY6Ns/A=="
     },
+    "node_modules/mlly": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/mlly/-/mlly-1.7.0.tgz",
+      "integrity": "sha512-U9SDaXGEREBYQgfejV97coK0UL1r+qnF2SyO9A3qcI8MzKnsIFKHNVEkrDyNncQTKQQumsasmeq84eNMdBfsNQ==",
+      "dev": true,
+      "dependencies": {
+        "acorn": "^8.11.3",
+        "pathe": "^1.1.2",
+        "pkg-types": "^1.1.0",
+        "ufo": "^1.5.3"
+      }
+    },
     "node_modules/moment": {
       "version": "2.30.1",
       "resolved": "https://registry.npmjs.org/moment/-/moment-2.30.1.tgz",
@@ -16711,6 +16980,21 @@
         "node": ">=4"
       }
     },
+    "node_modules/pathe": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/pathe/-/pathe-1.1.2.tgz",
+      "integrity": "sha512-whLdWMYL2TwI08hn8/ZqAbrVemu0LNaNNJZX73O6qaIdCTfXutsLhMkjdENX0qhsQ9uIimo4/aQOmXkoon2nDQ==",
+      "dev": true
+    },
+    "node_modules/pathval": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.1.tgz",
+      "integrity": "sha512-Dp6zGqpTdETdR63lehJYPeIOqpiNBNtc7BpWSLrOje7UaIsE5aY92r/AunQA7rsXvet3lrJ3JnZX29UPTKXyKQ==",
+      "dev": true,
+      "engines": {
+        "node": "*"
+      }
+    },
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@@ -18239,6 +18566,12 @@
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@@ -18810,6 +19143,12 @@
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@@ -18819,6 +19158,12 @@
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@@ -18971,6 +19316,18 @@
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@@ -18991,6 +19348,24 @@
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@@ -19191,6 +19566,12 @@
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@@ -19200,6 +19581,24 @@
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@@ -19736,6 +20135,15 @@
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+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+      "dev": true,
+      "engines": {
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       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.13.1.tgz",
@@ -19857,6 +20265,12 @@
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+      "resolved": "https://registry.npmjs.org/ufo/-/ufo-1.5.3.tgz",
+      "integrity": "sha512-Y7HYmWaFwPUmkoQCUIAYpKqkOf+SbVj/2fJJZ4RJMCfZp0rTGwRbzQD+HghfnhKOjL9E01okqz+ncJskGYfBNw==",
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       "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.0.2.tgz",
@@ -20281,6 +20695,28 @@
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+      "resolved": "https://registry.npmjs.org/vite-node/-/vite-node-1.6.0.tgz",
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+        "debug": "^4.3.4",
+        "pathe": "^1.1.1",
+        "picocolors": "^1.0.0",
+        "vite": "^5.0.0"
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+        "vite-node": "vite-node.mjs"
+      },
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+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
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     "node_modules/vite-plugin-static-copy": {
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@@ -20388,6 +20824,184 @@
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+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-1.6.0.tgz",
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+        "@vitest/runner": "1.6.0",
+        "@vitest/snapshot": "1.6.0",
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+        "chai": "^4.3.10",
+        "debug": "^4.3.4",
+        "execa": "^8.0.1",
+        "local-pkg": "^0.5.0",
+        "magic-string": "^0.30.5",
+        "pathe": "^1.1.1",
+        "picocolors": "^1.0.0",
+        "std-env": "^3.5.0",
+        "strip-literal": "^2.0.0",
+        "tinybench": "^2.5.1",
+        "tinypool": "^0.8.3",
+        "vite": "^5.0.0",
+        "vite-node": "1.6.0",
+        "why-is-node-running": "^2.2.2"
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+      "bin": {
+        "vitest": "vitest.mjs"
+      },
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+        "url": "https://opencollective.com/vitest"
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+        "@vitest/browser": "1.6.0",
+        "@vitest/ui": "1.6.0",
+        "happy-dom": "*",
+        "jsdom": "*"
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+      "peerDependenciesMeta": {
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+        "@vitest/browser": {
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+        "@vitest/ui": {
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+        },
+        "happy-dom": {
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+        },
+        "jsdom": {
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+        }
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+    "node_modules/vitest/node_modules/execa": {
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+      "resolved": "https://registry.npmjs.org/execa/-/execa-8.0.1.tgz",
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+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
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+      "integrity": "sha512-LnQR4bZ9IADDRSkvpqMGvt/tEJWclzklNgSw48V5EAaAeDd6qGvN8ei6k5p0tvxSR171VmGyHuTiAOfxAbr8kA==",
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+      "funding": {
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+      },
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+      }
+    },
+    "node_modules/vitest/node_modules/onetime": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/onetime/-/onetime-6.0.0.tgz",
+      "integrity": "sha512-1FlR+gjXK7X+AsAHso35MnyN5KqGwJRi/31ft6x0M194ht7S+rWAvd7PHss9xSKMzE0asv1pyIHaJYq+BbacAQ==",
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+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/vitest/node_modules/path-key": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/path-key/-/path-key-4.0.0.tgz",
+      "integrity": "sha512-haREypq7xkM7ErfgIyA0z+Bj4AGKlMSdlQE2jvJo6huWD1EdkKYV+G/T4nq0YEF2vgTT8kqMFKo1uHn950r4SQ==",
+      "dev": true,
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+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/vitest/node_modules/signal-exit": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-4.1.0.tgz",
+      "integrity": "sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw==",
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+      "funding": {
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     "node_modules/wcwidth": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",
@@ -20469,6 +21083,22 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.2.2.tgz",
+      "integrity": "sha512-6tSwToZxTOcotxHeA+qGCq1mVzKR3CwcJGmVcY+QE8SHy6TnpFnh8PAvPNHYr7EcuVeG0QSMxtYCuO1ta/G/oA==",
+      "dev": true,
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
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       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.5.tgz",
diff --git a/package.json b/package.json
index d0e745c..354f334 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "timetrack",
   "productName": "timetrack",
-  "version": "3.4.0",
+  "version": "3.5.0",
   "description": "Simple desktop application to track your time spent on different projects.",
   "main": ".vite/build/main.js",
   "scripts": {
@@ -9,6 +9,8 @@
     "package": "electron-forge package",
     "make": "electron-forge make",
     "publish": "electron-forge publish",
+    "test": "vitest --run ./src",
+    "test:watch": "vitest ./src",
     "lint": "eslint --ext .ts,.tsx .",
     "format": "prettier --ignore-path .gitignore --write \"**/*.+(js|ts|json|yml)\"",
     "update-interactive": "ncu --interactive",
@@ -37,8 +39,8 @@
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     "@electron-forge/plugin-auto-unpack-natives": "7.4.0",
     "@electron-forge/plugin-fuses": "7.4.0",
-    "@mistweaverco/electron-forge-plugin-vite": "7.4.2",
     "@electron/fuses": "1.8.0",
+    "@mistweaverco/electron-forge-plugin-vite": "7.4.2",
     "@types/js-yaml": "4.0.9",
     "@types/react": "18.3.2",
     "@types/react-dom": "18.3.0",
@@ -58,7 +60,8 @@
     "typescript": "4.5.4",
     "vite": "5.2.11",
     "vite-plugin-static-copy": "1.0.4",
-    "vite-tsconfig-paths": "4.3.2"
+    "vite-tsconfig-paths": "4.3.2",
+    "vitest": "1.6.0"
   },
   "dependencies": {
     "@fortawesome/fontawesome-free": "6.5.2",
diff --git a/src/lib/ConfigFile.test.ts b/src/lib/ConfigFile.test.ts
new file mode 100644
index 0000000..55668fe
--- /dev/null
+++ b/src/lib/ConfigFile.test.ts
@@ -0,0 +1,36 @@
+import { describe, test, expect, vitest } from 'vitest'
+import {
+  getUserConfig,
+  getUserDataPath,
+} from './ConfigFile';
+
+vitest.mock('electron', () => ({
+  app: {
+    getPath: () => '/home/marco/.config/timetrack',
+  },
+}));
+
+vitest.mock('node:fs/promises', () => ({
+  access: async (p: string) => {
+    if (p === '/home/marco/.config/timetrack') {
+      return Promise.resolve();
+    }
+    throw new Error('ENOENT');
+  },
+  mkdir: vitest.fn(),
+  readFile: vitest.fn(),
+}));
+
+describe('getUserConfig', () => {
+  test('should return null, because there is no user config', async () => {
+    const config = await getUserConfig();
+    expect(config).toEqual(null);
+  });
+});
+
+describe('getUserDataPath', () => {
+  test('should return the user data path', async () => {
+    const path = await getUserDataPath();
+    expect(path).toBe('/home/marco/.config/timetrack');
+  });
+});
diff --git a/src/lib/Time.ts b/src/lib/Time.ts
deleted file mode 100644
index e1a339e..0000000
--- a/src/lib/Time.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-export const convertSecondsToTime = (s: number) => {
-  const hours = String(Math.floor(s / 3600))
-  const minutes = String(Math.floor((s % 3600) / 60))
-  const seconds = String(s % 60)
-  return `${hours.padStart(2, '0')}:${minutes.padStart(2, '0')}:${seconds.padStart(2, '0')}`
-}
-
-export const convertTimeToSeconds = (
-  hours: string,
-  minutes: string,
-  seconds: string,
-) => {
-  return (
-    parseInt(hours, 10) * 3600 +
-    parseInt(minutes, 10) * 60 +
-    parseInt(seconds, 10)
-  )
-}
-
-export const convertTimestringToSeconds = (timestring: string) => {
-  const [hours, minutes, seconds] = timestring.split(':')
-  return convertTimeToSeconds(hours, minutes, seconds)
-}
diff --git a/src/lib/Utils.test.ts b/src/lib/Utils.test.ts
new file mode 100644
index 0000000..9929db6
--- /dev/null
+++ b/src/lib/Utils.test.ts
@@ -0,0 +1,46 @@
+import { describe, test, expect } from 'vitest'
+import {
+  getHMSToSeconds,
+  getHMSStringFromSeconds,
+  getHMSFromSeconds,
+  sleep,
+} from './Utils';
+
+describe('getHMSToSeconds', () => {
+  test('should convert hours, minutes, and seconds to seconds', () => {
+    expect(getHMSToSeconds(1, 1, 1)).toBe(3661);
+    expect(getHMSToSeconds(0, 0, 0)).toBe(0);
+    expect(getHMSToSeconds(0, 0, 1)).toBe(1);
+    expect(getHMSToSeconds(0, 1, 0)).toBe(60);
+    expect(getHMSToSeconds(1, 0, 0)).toBe(3600);
+  });
+});
+
+describe('getHMSStringFromSeconds', () => {
+  test('should convert seconds to HH:MM:SS format', () => {
+    expect(getHMSStringFromSeconds(3661)).toBe('01:01:01');
+    expect(getHMSStringFromSeconds(0)).toBe('00:00:00');
+    expect(getHMSStringFromSeconds(1)).toBe('00:00:01');
+    expect(getHMSStringFromSeconds(60)).toBe('00:01:00');
+    expect(getHMSStringFromSeconds(3600)).toBe('01:00:00');
+  });
+});
+
+describe('getHMSFromSeconds', () => {
+  test('should convert seconds to hours, minutes, and seconds', () => {
+    expect(getHMSFromSeconds(3661)).toEqual({ hours: 1, minutes: 1, seconds: 1 });
+    expect(getHMSFromSeconds(0)).toEqual({ hours: 0, minutes: 0, seconds: 0 });
+    expect(getHMSFromSeconds(1)).toEqual({ hours: 0, minutes: 0, seconds: 1 });
+    expect(getHMSFromSeconds(60)).toEqual({ hours: 0, minutes: 1, seconds: 0 });
+    expect(getHMSFromSeconds(3600)).toEqual({ hours: 1, minutes: 0, seconds: 0 });
+  });
+});
+
+describe('sleep', () => {
+  test('should wait for the specified amount of time', async () => {
+    const start = Date.now();
+    await sleep(500);
+    const end = Date.now();
+    expect(end - start).toBeGreaterThanOrEqual(500);
+  });
+});
diff --git a/src/lib/Utils.ts b/src/lib/Utils.ts
index 340b31a..9399445 100644
--- a/src/lib/Utils.ts
+++ b/src/lib/Utils.ts
@@ -20,28 +20,3 @@ export const getHMSStringFromSeconds = (s: number) => {
   const { hours, minutes, seconds } = getHMSFromSeconds(s)
   return `${String(hours).padStart(2, '0')}:${String(minutes).padStart(2, '0')}:${String(seconds).padStart(2, '0')}`
 }
-
-const removeActiveClassnameGeneric = (
-  rootQuery: string,
-  itemsQuery: string,
-) => {
-  const root = document.querySelector(rootQuery)
-  if (root) {
-    const items = root.querySelectorAll(itemsQuery)
-    if (items) {
-      items.forEach((n: HTMLDivElement) => n.classList.remove('is-active'))
-    }
-  }
-}
-
-export const removeActiveClassnameTasks = () => {
-  removeActiveClassnameGeneric('[data-tasks-list]', '.tasklist-item')
-}
-
-export const removeActiveClassnameTaskDefinitions = () => {
-  removeActiveClassnameGeneric('[data-taskdef-list]', '.panel-block')
-}
-
-export const removeActiveClassnameProjects = () => {
-  removeActiveClassnameGeneric('[data-projects-list]', '.panel-block')
-}
diff --git a/src/preload.test.ts b/src/preload.test.ts
new file mode 100644
index 0000000..63aeef2
--- /dev/null
+++ b/src/preload.test.ts
@@ -0,0 +1,7 @@
+import { describe, test, expect } from 'vitest';
+
+describe('preload', () => {
+  test('should pass', () => {
+    expect(1).toBe(1);
+  });
+});
diff --git a/tsconfig.json b/tsconfig.json
index 11686e3..4d64c9e 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,6 +13,9 @@
     "skipLibCheck": true,
     "sourceMap": true,
     "target": "ESNext",
+    "types": [
+      "vite/globals"
+    ],
     "paths": {
       "@components/*": ["src/components/*"],
       "@lib/*": ["./lib/*"]