diff --git a/.github/workflows/testWebEditor.yml b/.github/workflows/testWebEditor.yml
new file mode 100644
index 00000000..f6830cbb
--- /dev/null
+++ b/.github/workflows/testWebEditor.yml
@@ -0,0 +1,37 @@
+name: Web Editor Unit Test
+
+on:
+  workflow_dispatch:
+  push:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  pre_job:
+    runs-on: ubuntu-latest
+    outputs:
+      should_skip: ${{ steps.skip_check.outputs.should_skip }}
+    steps:
+      - id: skip_check
+        uses: fkirc/skip-duplicate-actions@v5
+        with:
+          concurrent_skipping: 'same_content_newer'
+          skip_after_successful_duplicate: 'true'
+
+  test:
+    needs: pre_job
+    if: ${{ needs.pre_job.outputs.should_skip != 'true' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - uses: actions/setup-node@v6
+        with:
+          node-version: "lts/*"
+
+      - name: Install and Run Tests
+        working-directory: frontend/webEditor
+        run: |
+          npm install
+          npm run test
\ No newline at end of file
diff --git a/frontend/webEditor/package-lock.json b/frontend/webEditor/package-lock.json
index 08d11fc7..4cdfe7b7 100644
--- a/frontend/webEditor/package-lock.json
+++ b/frontend/webEditor/package-lock.json
@@ -31,7 +31,8 @@
                 "sprotty-protocol": "^1.4.0",
                 "typescript": "^5.8.3",
                 "typescript-eslint": "^8.57.0",
-                "vite": "^7.3.1"
+                "vite": "^7.3.1",
+                "vitest": "^4.1.4"
             }
         },
         "node_modules/@babel/runtime": {
@@ -43,431 +44,6 @@
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             }
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-            ],
-            "dev": true,
-            "license": "MIT",
-            "optional": true,
-            "os": [
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-            ],
-            "engines": {
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-            }
-        },
-        "node_modules/@esbuild/android-arm": {
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-            "cpu": [
-                "arm"
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-            "dev": true,
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-            "optional": true,
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-                "android"
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-            "engines": {
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-        },
-        "node_modules/@esbuild/android-arm64": {
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-            "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.27.2.tgz",
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-        "node_modules/@esbuild/android-x64": {
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@@ -728,323 +304,50 @@
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         "node_modules/autocompleter": {
             "version": "9.3.2",
             "resolved": "https://registry.npmjs.org/autocompleter/-/autocompleter-9.3.2.tgz",
@@ -1565,6 +1016,16 @@
                 "node": ">=10.0.0"
             }
         },
+        "node_modules/chai": {
+            "version": "6.2.2",
+            "resolved": "https://registry.npmjs.org/chai/-/chai-6.2.2.tgz",
+            "integrity": "sha512-NUPRluOfOiTKBKvWPtSD4PhFvWCqOi0BGStNWs57X9js7XGTprSmFoz5F0tWhR4WPjNeR9jXqdC7/UpSJTnlRg==",
+            "dev": true,
+            "license": "MIT",
+            "engines": {
+                "node": ">=18"
+            }
+        },
         "node_modules/cli-cursor": {
             "version": "5.0.0",
             "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-5.0.0.tgz",
@@ -1605,6 +1066,13 @@
             "dev": true,
             "license": "MIT"
         },
+        "node_modules/convert-source-map": {
+            "version": "2.0.0",
+            "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-2.0.0.tgz",
+            "integrity": "sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==",
+            "dev": true,
+            "license": "MIT"
+        },
         "node_modules/core-js": {
             "version": "3.48.0",
             "resolved": "https://registry.npmjs.org/core-js/-/core-js-3.48.0.tgz",
@@ -1716,6 +1184,13 @@
                 "url": "https://github.com/sponsors/sindresorhus"
             }
         },
+        "node_modules/es-module-lexer": {
+            "version": "2.1.0",
+            "resolved": "https://registry.npmjs.org/es-module-lexer/-/es-module-lexer-2.1.0.tgz",
+            "integrity": "sha512-n27zTYMjYu1aj4MjCWzSP7G9r75utsaoc8m61weK+W8JMBGGQybd43GstCXZ3WNmSFtGT9wi59qQTW6mhTR5LQ==",
+            "dev": true,
+            "license": "MIT"
+        },
         "node_modules/esbuild": {
             "version": "0.27.2",
             "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.27.2.tgz",
@@ -1999,6 +1474,16 @@
                 "node": ">=4.0"
             }
         },
+        "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,
+            "license": "MIT",
+            "dependencies": {
+                "@types/estree": "^1.0.0"
+            }
+        },
         "node_modules/esutils": {
             "version": "2.0.3",
             "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.3.tgz",
@@ -2016,6 +1501,16 @@
             "dev": true,
             "license": "MIT"
         },
+        "node_modules/expect-type": {
+            "version": "1.3.0",
+            "resolved": "https://registry.npmjs.org/expect-type/-/expect-type-1.3.0.tgz",
+            "integrity": "sha512-knvyeauYhqjOYvQ66MznSMs83wmHrCycNEN6Ao+2AeYEfxUIkuiVxdEa1qlGEPK+We3n0THiDciYSsCcgW/DoA==",
+            "dev": true,
+            "license": "Apache-2.0",
+            "engines": {
+                "node": ">=12.0.0"
+            }
+        },
         "node_modules/fast-deep-equal": {
             "version": "3.1.3",
             "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
@@ -2118,21 +1613,6 @@
             "integrity": "sha512-l/YiRdBSH/eWv6OF3sLGkwErL+n0MqCICi9mppTZBOCL5vixWGDqCYvRcuxB2h7RGCTzaTKOHT2caHvCXQPRlw==",
             "license": "MIT"
         },
-        "node_modules/fsevents": {
-            "version": "2.3.3",
-            "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
-            "integrity": "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==",
-            "dev": true,
-            "hasInstallScript": true,
-            "license": "MIT",
-            "optional": true,
-            "os": [
-                "darwin"
-            ],
-            "engines": {
-                "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
-            }
-        },
         "node_modules/get-east-asian-width": {
             "version": "1.6.0",
             "resolved": "https://registry.npmjs.org/get-east-asian-width/-/get-east-asian-width-1.6.0.tgz",
@@ -2381,16 +1861,16 @@
             }
         },
         "node_modules/lint-staged": {
-            "version": "17.0.5",
-            "resolved": "https://registry.npmjs.org/lint-staged/-/lint-staged-17.0.5.tgz",
-            "integrity": "sha512-d12yC+/e8RhBjZtaxZn71FyrgU/P5e+uAPifhCLwdosQZP/zamSdKRWDC30ocVIbzDKiFG1McHc/LUgB92GIPw==",
+            "version": "17.0.8",
+            "resolved": "https://registry.npmjs.org/lint-staged/-/lint-staged-17.0.8.tgz",
+            "integrity": "sha512-B2P/d+jVW0UXOQ0MVMLrB/9ydA1P+zz6jYfdrbbEd9ur3S2rcbduFWKiUCC02Sm5hbC8nrm7y24WuYMG54HfxA==",
             "dev": true,
             "license": "MIT",
             "dependencies": {
                 "listr2": "^10.2.1",
                 "picomatch": "^4.0.4",
                 "string-argv": "^0.3.2",
-                "tinyexec": "^1.1.2"
+                "tinyexec": "^1.2.4"
             },
             "bin": {
                 "lint-staged": "bin/lint-staged.js"
@@ -2402,13 +1882,13 @@
                 "url": "https://opencollective.com/lint-staged"
             },
             "optionalDependencies": {
-                "yaml": "^2.8.4"
+                "yaml": "^2.9.0"
             }
         },
         "node_modules/listr2": {
-            "version": "10.2.1",
-            "resolved": "https://registry.npmjs.org/listr2/-/listr2-10.2.1.tgz",
-            "integrity": "sha512-7I5knELsJKTUjXG+A6BkKAiGkW1i25fNa/xlUl9hFtk15WbE9jndA89xu5FzQKrY5llajE1hfZZFMILXkDHk/Q==",
+            "version": "10.2.2",
+            "resolved": "https://registry.npmjs.org/listr2/-/listr2-10.2.2.tgz",
+            "integrity": "sha512-JtNtbZj8q5BnDMR7trpwvwk3RIrANtIVzEUm8w7amp6xelLgyuq+4WZoTH913XaQAoH/cNdYhaNzBPA2U3xbDw==",
             "dev": true,
             "license": "MIT",
             "dependencies": {
@@ -2546,6 +2026,16 @@
                 "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
             }
         },
+        "node_modules/magic-string": {
+            "version": "0.30.21",
+            "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.21.tgz",
+            "integrity": "sha512-vd2F4YUyEXKGcLHoq+TEyCjxueSeHnFxyyjNp80yg0XV4vUhnDer/lvvlqM/arB5bXQN5K2/3oinyCRyx8T2CQ==",
+            "dev": true,
+            "license": "MIT",
+            "dependencies": {
+                "@jridgewell/sourcemap-codec": "^1.5.5"
+            }
+        },
         "node_modules/mimic-function": {
             "version": "5.0.1",
             "resolved": "https://registry.npmjs.org/mimic-function/-/mimic-function-5.0.1.tgz",
@@ -2622,6 +2112,17 @@
                 "node": ">=0.10.0"
             }
         },
+        "node_modules/obug": {
+            "version": "2.1.1",
+            "resolved": "https://registry.npmjs.org/obug/-/obug-2.1.1.tgz",
+            "integrity": "sha512-uTqF9MuPraAQ+IsnPf366RG4cP9RtUi7MLO1N3KEc+wb0a6yKpeL0lmk2IB1jY5KHPAlTc6T/JRdC/YqxHNwkQ==",
+            "dev": true,
+            "funding": [
+                "https://github.com/sponsors/sxzz",
+                "https://opencollective.com/debug"
+            ],
+            "license": "MIT"
+        },
         "node_modules/onetime": {
             "version": "7.0.0",
             "resolved": "https://registry.npmjs.org/onetime/-/onetime-7.0.0.tgz",
@@ -2737,6 +2238,13 @@
                 "node": ">=8"
             }
         },
+        "node_modules/pathe": {
+            "version": "2.0.3",
+            "resolved": "https://registry.npmjs.org/pathe/-/pathe-2.0.3.tgz",
+            "integrity": "sha512-WUjGcAqP1gQacoQe+OBJsFA7Ld4DyXuUIjZ5cc75cLHvJ7dtNsTugphxIADwspS+AraAUePCKrSVtPLFj/F88w==",
+            "dev": true,
+            "license": "MIT"
+        },
         "node_modules/performance-now": {
             "version": "2.1.0",
             "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
@@ -2975,6 +2483,13 @@
                 "node": ">=8"
             }
         },
+        "node_modules/siginfo": {
+            "version": "2.0.0",
+            "resolved": "https://registry.npmjs.org/siginfo/-/siginfo-2.0.0.tgz",
+            "integrity": "sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==",
+            "dev": true,
+            "license": "ISC"
+        },
         "node_modules/signal-exit": {
             "version": "4.1.0",
             "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-4.1.0.tgz",
@@ -3096,6 +2611,13 @@
                 "node": ">=8.3.0"
             }
         },
+        "node_modules/stackback": {
+            "version": "0.0.2",
+            "resolved": "https://registry.npmjs.org/stackback/-/stackback-0.0.2.tgz",
+            "integrity": "sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw==",
+            "dev": true,
+            "license": "MIT"
+        },
         "node_modules/stackblur-canvas": {
             "version": "2.7.0",
             "resolved": "https://registry.npmjs.org/stackblur-canvas/-/stackblur-canvas-2.7.0.tgz",
@@ -3106,6 +2628,13 @@
                 "node": ">=0.1.14"
             }
         },
+        "node_modules/std-env": {
+            "version": "4.1.0",
+            "resolved": "https://registry.npmjs.org/std-env/-/std-env-4.1.0.tgz",
+            "integrity": "sha512-Rq7ybcX2RuC55r9oaPVEW7/xu3tj8u4GeBYHBWCychFtzMIr86A7e3PPEBPT37sHStKX3+TiX/Fr/ACmJLVlLQ==",
+            "dev": true,
+            "license": "MIT"
+        },
         "node_modules/string-argv": {
             "version": "0.3.2",
             "resolved": "https://registry.npmjs.org/string-argv/-/string-argv-0.3.2.tgz",
@@ -3117,9 +2646,9 @@
             }
         },
         "node_modules/string-width": {
-            "version": "8.2.1",
-            "resolved": "https://registry.npmjs.org/string-width/-/string-width-8.2.1.tgz",
-            "integrity": "sha512-IIaP0g3iy9Cyy18w3M9YcaDudujEAVHKt3a3QJg1+sr/oX96TbaGUubG0hJyCjCBThFH+tFpcIyoUHUn1ogaLA==",
+            "version": "8.2.2",
+            "resolved": "https://registry.npmjs.org/string-width/-/string-width-8.2.2.tgz",
+            "integrity": "sha512-GaPUh5gfdrYzqeVNZvUfT23vYYxXzKYidUcnMtJg/3rxRV63EFZy3k6xfKlmfeJD0176lnUV/Usr3XcwSvFzpg==",
             "dev": true,
             "license": "MIT",
             "dependencies": {
@@ -3206,10 +2735,17 @@
                 "utrie": "^1.0.2"
             }
         },
+        "node_modules/tinybench": {
+            "version": "2.9.0",
+            "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
+            "integrity": "sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg==",
+            "dev": true,
+            "license": "MIT"
+        },
         "node_modules/tinyexec": {
-            "version": "1.2.2",
-            "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.2.2.tgz",
-            "integrity": "sha512-M/Q0B2cp4K7kynaT/vnED1j8TlLY+Pp7C6Wl2bl/7u/F0mUVwdyOpwomQb8JpYLitHUssAJRmLZdMCGsrx7i+g==",
+            "version": "1.2.4",
+            "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.2.4.tgz",
+            "integrity": "sha512-SHf/r48b7vOrjve9PxJo3MN5v5yuyjHvdUcrQffT3WXMUfnGmHDVbC4k3sHJaJTgZCwpUplIaAo5ANtMyp3YHg==",
             "dev": true,
             "license": "MIT",
             "engines": {
@@ -3258,6 +2794,16 @@
             "dev": true,
             "license": "ISC"
         },
+        "node_modules/tinyrainbow": {
+            "version": "3.1.0",
+            "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.1.0.tgz",
+            "integrity": "sha512-Bf+ILmBgretUrdJxzXM0SgXLZ3XfiaUuOj/IKQHuTXip+05Xn+uyEYdVg0kYDipTBcLrCVyUzAPz7QmArb0mmw==",
+            "dev": true,
+            "license": "MIT",
+            "engines": {
+                "node": ">=14.0.0"
+            }
+        },
         "node_modules/ts-api-utils": {
             "version": "2.4.0",
             "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.4.0.tgz",
@@ -3435,6 +2981,96 @@
                 }
             }
         },
+        "node_modules/vitest": {
+            "version": "4.1.8",
+            "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.8.tgz",
+            "integrity": "sha512-flY6ScbCIt9HThs+C5HS7jvGOB560DJtk/Z15IQROTA6zEy49Nh8T/dofWTQL+n3vswqn87sbJNiuqw1SDp5Ig==",
+            "dev": true,
+            "license": "MIT",
+            "dependencies": {
+                "@vitest/expect": "4.1.8",
+                "@vitest/mocker": "4.1.8",
+                "@vitest/pretty-format": "4.1.8",
+                "@vitest/runner": "4.1.8",
+                "@vitest/snapshot": "4.1.8",
+                "@vitest/spy": "4.1.8",
+                "@vitest/utils": "4.1.8",
+                "es-module-lexer": "^2.0.0",
+                "expect-type": "^1.3.0",
+                "magic-string": "^0.30.21",
+                "obug": "^2.1.1",
+                "pathe": "^2.0.3",
+                "picomatch": "^4.0.3",
+                "std-env": "^4.0.0-rc.1",
+                "tinybench": "^2.9.0",
+                "tinyexec": "^1.0.2",
+                "tinyglobby": "^0.2.15",
+                "tinyrainbow": "^3.1.0",
+                "vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
+                "why-is-node-running": "^2.3.0"
+            },
+            "bin": {
+                "vitest": "vitest.mjs"
+            },
+            "engines": {
+                "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+            },
+            "funding": {
+                "url": "https://opencollective.com/vitest"
+            },
+            "peerDependencies": {
+                "@edge-runtime/vm": "*",
+                "@opentelemetry/api": "^1.9.0",
+                "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+                "@vitest/browser-playwright": "4.1.8",
+                "@vitest/browser-preview": "4.1.8",
+                "@vitest/browser-webdriverio": "4.1.8",
+                "@vitest/coverage-istanbul": "4.1.8",
+                "@vitest/coverage-v8": "4.1.8",
+                "@vitest/ui": "4.1.8",
+                "happy-dom": "*",
+                "jsdom": "*",
+                "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+            },
+            "peerDependenciesMeta": {
+                "@edge-runtime/vm": {
+                    "optional": true
+                },
+                "@opentelemetry/api": {
+                    "optional": true
+                },
+                "@types/node": {
+                    "optional": true
+                },
+                "@vitest/browser-playwright": {
+                    "optional": true
+                },
+                "@vitest/browser-preview": {
+                    "optional": true
+                },
+                "@vitest/browser-webdriverio": {
+                    "optional": true
+                },
+                "@vitest/coverage-istanbul": {
+                    "optional": true
+                },
+                "@vitest/coverage-v8": {
+                    "optional": true
+                },
+                "@vitest/ui": {
+                    "optional": true
+                },
+                "happy-dom": {
+                    "optional": true
+                },
+                "jsdom": {
+                    "optional": true
+                },
+                "vite": {
+                    "optional": false
+                }
+            }
+        },
         "node_modules/which": {
             "version": "2.0.2",
             "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -3451,6 +3087,23 @@
                 "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",
diff --git a/frontend/webEditor/package.json b/frontend/webEditor/package.json
index 1ed7333c..0a54f97e 100644
--- a/frontend/webEditor/package.json
+++ b/frontend/webEditor/package.json
@@ -27,12 +27,14 @@
         "sprotty-protocol": "^1.4.0",
         "typescript": "^5.8.3",
         "typescript-eslint": "^8.57.0",
-        "vite": "^7.3.1"
+        "vite": "^7.3.1",
+        "vitest": "^4.1.4"
     },
     "scripts": {
         "dev": "vite",
         "build": "tsc && vite build",
         "preview": "vite preview",
+        "test": "vitest",
         "format": "prettier --write \"./**/*.{html,css,ts,tsx,json}\"",
         "lint": "eslint --max-warnings 0 --no-warn-ignored",
         "prepare": "cd ../../ && husky ./frontend/webEditor/.husky",
diff --git a/frontend/webEditor/tests/languages/AssignmentLanguage.test.ts b/frontend/webEditor/tests/languages/AssignmentLanguage.test.ts
new file mode 100644
index 00000000..7e1f13b9
--- /dev/null
+++ b/frontend/webEditor/tests/languages/AssignmentLanguage.test.ts
@@ -0,0 +1,78 @@
+import { AssignmentLanguageTreeBuilder } from "../../src/assignment/language";
+import { DfdNodeImpl } from "../../src/diagram/nodes/common";
+import { DfdOutputPortImpl } from "../../src/diagram/ports/DfdOutputPort";
+import { LabelTypeRegistry } from "../../src/labels/LabelTypeRegistry";
+import {
+    ValidExpressionTestData,
+    AutoCompleteTestData,
+    generateTests,
+    InvalidExpressionTestData,
+    ReplacementTestData,
+} from "./LanguageTestUtils";
+
+const BASE_VALID_EXPRESSIONS: ValidExpressionTestData[] = [
+    ["forward flow"],
+    ["forward hello|world"],
+    ["set Sensitivity.Public"],
+    ["unset Location.nonEU"],
+    ["assign Sensitivity.Public if TRUE from flow"],
+    ["assign Sensitivity.Public if TRUE"],
+    ["assign Sensitivity.Public if flow.Sensitivity.Public"],
+];
+
+const VALID_EXPRESSIONS = [...BASE_VALID_EXPRESSIONS, BASE_VALID_EXPRESSIONS.flat()];
+
+const INVALID_EXPRESSIONS: InvalidExpressionTestData[] = [
+    { input: ["forward Sensitivity.Public"] },
+    { input: ["set flow"] },
+    { input: ["forward hello"] },
+    { input: ["set Sensitivity.public"] },
+    { input: ["set sensitivity.Public"] },
+];
+
+const AUTOCOMPLETE_TEST_DATA: AutoCompleteTestData[] = [
+    { input: [""], completionOptions: ["forward", "set", "unset", "assign"], exactOptionCount: true },
+    { input: ["forward "], completionOptions: ["flow", "hello|world"], exactOptionCount: true },
+    { input: ["set "], completionOptions: ["Sensitivity", "Location"], exactOptionCount: true },
+    { input: ["set Sensitivity."], completionOptions: ["Personal", "Public"], exactOptionCount: true },
+    { input: ["unset "], completionOptions: ["Sensitivity", "Location"], exactOptionCount: true },
+    { input: ["assign "], completionOptions: ["Sensitivity", "Location"] },
+    { input: ["assign Sensitivity.Public "], completionOptions: ["if"], exactOptionCount: true },
+    { input: ["assign Sensitivity.Public if TRUE "], completionOptions: ["from"] },
+];
+
+const REPLACEMENT_TEST_DATA: ReplacementTestData[] = [
+    {
+        input: ["set Sensitivity.Public"],
+        replacement: { old: "Sensitivity.Public", replacement: "Sensitivity.New", type: "label" },
+        output: ["set Sensitivity.New"],
+    },
+];
+
+const labelTypeRegistry = new LabelTypeRegistry();
+const location = labelTypeRegistry.registerLabelType("Location");
+for (const defaultValue of location.values) {
+    labelTypeRegistry.unregisterLabelTypeValue(location.id, defaultValue.id);
+}
+labelTypeRegistry.registerLabelTypeValue(location.id, "EU");
+labelTypeRegistry.registerLabelTypeValue(location.id, "nonEU");
+const sensitivity = labelTypeRegistry.registerLabelType("Sensitivity");
+for (const defaultValue of sensitivity.values) {
+    labelTypeRegistry.unregisterLabelTypeValue(sensitivity.id, defaultValue.id);
+}
+labelTypeRegistry.registerLabelTypeValue(sensitivity.id, "Personal");
+labelTypeRegistry.registerLabelTypeValue(sensitivity.id, "Public");
+
+const mockPort = {
+    // @ts-expect-error We mock the abstract class into a concrete one for simplicity. TypeScript however still thinks this is an abstract class, so it would throw an error
+    parent: new DfdNodeImpl(),
+} as unknown as DfdOutputPortImpl;
+
+generateTests(
+    "Assignment Language",
+    AssignmentLanguageTreeBuilder.buildTree(mockPort, labelTypeRegistry),
+    VALID_EXPRESSIONS,
+    INVALID_EXPRESSIONS,
+    AUTOCOMPLETE_TEST_DATA,
+    REPLACEMENT_TEST_DATA,
+);
diff --git a/frontend/webEditor/tests/languages/LanguageFunctionality.test.ts b/frontend/webEditor/tests/languages/LanguageFunctionality.test.ts
new file mode 100644
index 00000000..27d81750
--- /dev/null
+++ b/frontend/webEditor/tests/languages/LanguageFunctionality.test.ts
@@ -0,0 +1,140 @@
+/*
+Tests whether the functions verify, complete and replace to what they are supposed to with a simple custom language:
+
+root
+ ├─> circle1 <─────────┐
+ │      └─> circle2* ──┘
+ │
+ └──> child
+        ├──> !child1
+        │      └──> any ──┐
+        │                 ├──> child3,... ──> child4
+        └──> child2* ─────┘
+
+* = can be end state
+! is optional for negation
+,... is a list with the same word
+*/
+import { ReplacementData } from "../../src/languages/replace";
+import { LanguageTreeNode } from "../../src/languages/tokenize";
+import { AnyWord, ConstantWord, ListWord, NegatableWord, Word } from "../../src/languages/words";
+import {
+    AutoCompleteTestData,
+    generateTests,
+    InvalidExpressionTestData,
+    ReplacementTestData,
+} from "./LanguageTestUtils";
+
+const VALID_EXPRESSIONS = [
+    ["root circle1 circle2"],
+    ["root", "circle1", "circle2"],
+    ["root", "circle1 circle2", "circle1 circle2", "circle1 circle2", "circle1 circle2", "circle1 circle2"],
+    ["root", "circle1 circle2", "    circle1 circle2", "\tcircle1 circle2", "circle1 circle2", "circle1 circle2"],
+    ["root child", "child1 bla child3 child4"],
+    ["root child", "!child1 blab child3 child4"],
+    ["root child child2"],
+    ["root child child2 child3 child4"],
+    ["root child child2 child3,child3 child4"],
+    ["root child child2 child3,child3,child3 child4"],
+];
+const INVALID_EXPRESSIONS: InvalidExpressionTestData[] = [
+    { input: ["root"] },
+    { input: ["root circle1 circle2 circle1"] },
+    { input: ["root WRONG child2"], output: [{ line: 1, startColumn: 6, endColumn: 11 }] },
+    {
+        input: ["root", "circle1 circle2", "circle1 circle2", "circle1 circle2", "circle1 circle2", "WRONG circle2"],
+        output: [{ line: 6, startColumn: 1, endColumn: 6 }],
+    },
+    { input: ["root child child2 child3,child3, child4"] },
+];
+const AUTOCOMPLETE_TEST_DATA: AutoCompleteTestData[] = [
+    { input: ["root "], completionOptions: ["circle1", "child"], exactOptionCount: true },
+    { input: ["root c"], completionOptions: ["circle1", "child"], exactOptionCount: true },
+    {
+        input: ["root", "circle1 circle2", "circle1 circle2", "circle1 circle2", "circle1 circle2", "circle1 "],
+        completionOptions: ["circle2"],
+    },
+    { input: ["root child !"], completionOptions: ["child1"] },
+    { input: ["root child child2 child3,child3,child3 child4 "], completionOptions: [], exactOptionCount: true },
+];
+const simpleInput1 = ["root child child1 bla child3 child4"];
+const simpleInput2 = ["root circle1 circle2 circle1 circle2"];
+const REPLACEMENT_TEST_DATA: ReplacementTestData[] = [
+    {
+        input: ["root child child1 bla child3 child4"],
+        output: ["root child child1 blub child3 child4"],
+        replacement: { old: "bla", replacement: "blub", type: "replaceAny" },
+    },
+    {
+        input: ["root child child1 bla child3 chil"],
+        output: ["root child child1 blub child3 chil"],
+        replacement: { old: "bla", replacement: "blub", type: "replaceAny" },
+    },
+    // check that no wrong replacements happen
+    { input: simpleInput1, output: simpleInput1, replacement: { old: "blub", replacement: "bla", type: "replaceAny" } },
+    { input: simpleInput1, output: simpleInput1, replacement: { old: "bla", replacement: "blub", type: "WRONG" } },
+    {
+        input: simpleInput2,
+        output: simpleInput2,
+        replacement: { old: "circle1", replacement: "circle2", type: "replaceAny" },
+    },
+];
+
+const circleNode1: LanguageTreeNode<Word> = {
+    word: new ConstantWord("circle1"),
+    children: [],
+};
+const circleNode2: LanguageTreeNode<Word> = {
+    word: new ConstantWord("circle2"),
+    children: [circleNode1],
+    canBeFinal: true,
+};
+circleNode1.children.push(circleNode2);
+
+const child4: LanguageTreeNode<Word> = {
+    word: new ConstantWord("child4"),
+    children: [],
+};
+const child3: LanguageTreeNode<Word> = {
+    word: new ListWord(new ConstantWord("child3")),
+    children: [child4],
+};
+const child2: LanguageTreeNode<Word> = {
+    word: new ConstantWord("child2"),
+    children: [child3],
+    canBeFinal: true,
+};
+class ReplaceAnyWord extends AnyWord {
+    replace(text: string, replacement: ReplacementData): string {
+        if (replacement.type === "replaceAny" && text === replacement.old) {
+            return replacement.replacement;
+        }
+        return text;
+    }
+}
+const anyChild: LanguageTreeNode<Word> = {
+    word: new ReplaceAnyWord(),
+    children: [child3],
+};
+const child1: LanguageTreeNode<Word> = {
+    word: new NegatableWord(new ConstantWord("child1")),
+    children: [anyChild],
+};
+const child: LanguageTreeNode<Word> = {
+    word: new ConstantWord("child"),
+    children: [child1, child2],
+};
+
+const root: LanguageTreeNode<Word> = {
+    word: new ConstantWord("root"),
+    children: [circleNode1, child],
+};
+
+generateTests(
+    "Functionality Test Language",
+    [root],
+    VALID_EXPRESSIONS,
+    INVALID_EXPRESSIONS,
+    AUTOCOMPLETE_TEST_DATA,
+    REPLACEMENT_TEST_DATA,
+);
diff --git a/frontend/webEditor/tests/languages/LanguageTestUtils.ts b/frontend/webEditor/tests/languages/LanguageTestUtils.ts
new file mode 100644
index 00000000..d6359358
--- /dev/null
+++ b/frontend/webEditor/tests/languages/LanguageTestUtils.ts
@@ -0,0 +1,112 @@
+import { expect, it } from "vitest";
+import { verify, VerifyWord } from "../../src/languages/verify";
+import { complete, CompletionWord } from "../../src/languages/autocomplete";
+import { replace, ReplaceableWord, ReplacementData } from "../../src/languages/replace";
+import { LanguageTreeNode, tokenize } from "../../src/languages/tokenize";
+
+export function generateTests(
+    name: string,
+    tree: LanguageTreeNode<VerifyWord & CompletionWord & ReplaceableWord>[],
+    validExpressions: ValidExpressionTestData[],
+    invalidExpressions: InvalidExpressionTestData[],
+    autoCompleteTests: AutoCompleteTestData[],
+    replacementTests: ReplacementTestData[],
+) {
+    for (let i = 0; i < validExpressions.length; i++) {
+        it(`${name} Valid Expression ${i}`, () => {
+            const tokens = tokenize(validExpressions[i]);
+            const result = verify(tokens, tree);
+            expect(
+                result.length,
+                `Valid Expression ${joinLines(validExpressions[i])} had Errors: ${result.map((v) => JSON.stringify(v)).join("\n")}`,
+            ).toBe(0);
+        });
+    }
+
+    for (let i = 0; i < invalidExpressions.length; i++) {
+        it(`${name} Invalid Expression ${i}`, () => {
+            const tokens = tokenize(invalidExpressions[i].input);
+            const result = verify(tokens, tree);
+            expect(
+                result.length,
+                `Invalid Expression ${joinLines(invalidExpressions[i].input)} had no Errors`,
+            ).toBeGreaterThan(0);
+            if (invalidExpressions[i].output !== undefined) {
+                for (const expectedError of invalidExpressions[i].output!) {
+                    expect
+                        .soft(
+                            result.find(
+                                (e) =>
+                                    e.line === expectedError.line &&
+                                    e.startColumn === expectedError.startColumn &&
+                                    (expectedError.endColumn === undefined || e.endColumn === expectedError.endColumn),
+                            ),
+                            `Could not find Error at ${JSON.stringify(expectedError)} in ${joinLines(invalidExpressions[i].input)}`,
+                        )
+                        .toBeDefined();
+                }
+            }
+        });
+    }
+
+    for (let i = 0; i < autoCompleteTests.length; i++) {
+        it(`${name} Autocomplete ${i}`, () => {
+            const tokens = tokenize(autoCompleteTests[i].input);
+            const result = complete(tokens, tree);
+            const completionStrings = result.map((r) => r.insertText);
+            if (autoCompleteTests[i].exactOptionCount === true) {
+                expect.soft(result.length).toBe(autoCompleteTests[i].completionOptions.length);
+            }
+            for (const option of autoCompleteTests[i].completionOptions) {
+                expect
+                    .soft(
+                        completionStrings.includes(option),
+                        `Autocompletion for ${joinLines(autoCompleteTests[i].input)} did not provide option ${option}`,
+                    )
+                    .toBeTruthy();
+            }
+        });
+    }
+
+    for (let i = 0; i < replacementTests.length; i++) {
+        it(`${name} Replacement ${i}`, () => {
+            const result = replace(replacementTests[i].input, tree, replacementTests[i].replacement);
+            expect(
+                result.length,
+                `Replacement ${replacementTests[i].replacement} resulted in wrong length for ${joinLines(replacementTests[i].input)}`,
+            ).toEqual(replacementTests[i].output.length);
+            for (let l = 0; l < result.length; l++) {
+                expect
+                    .soft(
+                        result[l],
+                        `Line ${l + 1} did not match after replacement ${replacementTests[i].replacement} for in ${joinLines(replacementTests[i].input)}`,
+                    )
+                    .toBe(replacementTests[i].output[l]);
+            }
+        });
+    }
+}
+
+export type ValidExpressionTestData = string[];
+
+export interface InvalidExpressionTestData {
+    input: string[];
+    output?: { line: number; startColumn: number; endColumn?: number }[];
+}
+
+export interface AutoCompleteTestData {
+    input: string[];
+    completionOptions: string[];
+    // if set to true, checks that the number of options returned by the completer matches the length of completionOptions (default: false)
+    exactOptionCount?: boolean;
+}
+
+export interface ReplacementTestData {
+    input: string[];
+    replacement: ReplacementData;
+    output: string[];
+}
+
+export function joinLines(input: string[]) {
+    return input.join("\\n");
+}
diff --git a/frontend/webEditor/tests/languages/SimpleConstraintLanguage.test.ts b/frontend/webEditor/tests/languages/SimpleConstraintLanguage.test.ts
new file mode 100644
index 00000000..85b7066b
--- /dev/null
+++ b/frontend/webEditor/tests/languages/SimpleConstraintLanguage.test.ts
@@ -0,0 +1,63 @@
+import { LocalModelSource } from "sprotty";
+import { ConstraintDslTreeBuilder } from "../../src/constraint/language";
+import { LabelTypeRegistry } from "../../src/labels/LabelTypeRegistry";
+import {
+    ValidExpressionTestData,
+    AutoCompleteTestData,
+    generateTests,
+    InvalidExpressionTestData,
+    ReplacementTestData,
+} from "./LanguageTestUtils";
+
+
+const VALID_EXPRESSIONS: ValidExpressionTestData[] = [
+    ["- Test: data Sensitivity.Personal neverFlows vertex Location.nonEU"],
+    ["- Auth_request: data Sensitivity.Personal,Location.EU neverFlows vertex !Location.EU"],
+    ["- test: data Sensitivity.Personal neverFlows"],
+    ["- Test: data Sensitivity.Personal", "    neverFlows", "    vertex Location.nonEU"],
+];
+
+const INVALID_EXPRESSIONS: InvalidExpressionTestData[] = [
+    { input: ["- data Sensitivity.Personal neverFlows vertex Location.nonEU"] },
+    { input: ["- Test: data Sensitivity.Personal vertex Location.nonEU"] }
+];
+
+const AUTOCOMPLETE_TEST_DATA: AutoCompleteTestData[] = [
+    { input: ["- Test: "], completionOptions: ["data", "vertex"], exactOptionCount: true },
+    { input: ["- Test: data "], completionOptions: ["Sensitivity", "named", "Location", "type"] },
+    { input: ["- Test: data Sensitivity.Personal "], completionOptions: ["neverFlows", "vertex"] },
+    { input: ["- Test: data Sensitivity.Personal neverFlows "], completionOptions: ["where", "vertex"] },
+    { input: ["- Test: data Sensitivity.Personal neverFlows vertex Location."], completionOptions: ["EU", "nonEU"] }
+];
+
+const REPLACEMENT_TEST_DATA: ReplacementTestData[] = [{
+        input: ["- Test: data Sensitivity.Personal neverFlows vertex Location.nonEU"],
+        replacement: { old: "Sensitivity.Personal", replacement: "Sensitivity.New", type: "label" },
+        output: ["- Test: data Sensitivity.New neverFlows vertex Location.nonEU"],
+    }];
+
+const labelTypeRegistry = new LabelTypeRegistry();
+const location = labelTypeRegistry.registerLabelType("Location");
+for (const defaultValue of location.values) {
+    labelTypeRegistry.unregisterLabelTypeValue(location.id, defaultValue.id);
+}
+labelTypeRegistry.registerLabelTypeValue(location.id, "EU");
+labelTypeRegistry.registerLabelTypeValue(location.id, "nonEU");
+const sensitivity = labelTypeRegistry.registerLabelType("Sensitivity");
+for (const defaultValue of sensitivity.values) {
+    labelTypeRegistry.unregisterLabelTypeValue(sensitivity.id, defaultValue.id);
+}
+labelTypeRegistry.registerLabelTypeValue(sensitivity.id, "Personal");
+labelTypeRegistry.registerLabelTypeValue(sensitivity.id, "Public");
+
+const mockModel = {
+} as unknown as LocalModelSource;
+
+generateTests(
+    "Simple Constraint Language",
+    ConstraintDslTreeBuilder.buildTree(mockModel, labelTypeRegistry),
+    VALID_EXPRESSIONS,
+    INVALID_EXPRESSIONS,
+    AUTOCOMPLETE_TEST_DATA,
+    REPLACEMENT_TEST_DATA,
+);
diff --git a/frontend/webEditor/tests/languages/mockMonaco.ts b/frontend/webEditor/tests/languages/mockMonaco.ts
new file mode 100644
index 00000000..631e7986
--- /dev/null
+++ b/frontend/webEditor/tests/languages/mockMonaco.ts
@@ -0,0 +1,18 @@
+import { vi } from "vitest";
+
+vi.stubGlobal("window", {
+    location: {
+        href: "",
+    },
+});
+
+vi.mock("../../src/diagram/ports/DfdOutputPort", () => ({}));
+
+vi.mock("../../src/diagram/nodes/common", () => {
+    class DfdNodeImpl {
+        // add any abstract methods the tested code calls
+        getAvailableInputs = vi.fn().mockReturnValue(["flow", "hello|world"]);
+    }
+
+    return { DfdNodeImpl };
+});
diff --git a/frontend/webEditor/tests/languages/tokenize.test.ts b/frontend/webEditor/tests/languages/tokenize.test.ts
new file mode 100644
index 00000000..d2cf8fdb
--- /dev/null
+++ b/frontend/webEditor/tests/languages/tokenize.test.ts
@@ -0,0 +1,54 @@
+import { expect, it } from "vitest";
+import { Token, tokenize } from "../../src/languages/tokenize";
+import { joinLines } from "./LanguageTestUtils";
+
+it("Tokenization", () => {
+    for (const testSet of TEST_DATA) {
+        const result = tokenize(testSet.input);
+        expect(result.length, `Unexpected Token length for input "${joinLines(testSet.input)}"`).toBe(
+            testSet.expected.length,
+        );
+        for (let i = 0; i < testSet.expected.length; i++) {
+            const keysToTest = Object.keys(testSet.expected[i]) as (keyof Token)[];
+            for (const key of keysToTest) {
+                expect
+                    .soft(
+                        result[i][key],
+                        `Property of token ${i} with key "${key}" for input "${joinLines(testSet.input)}" did not match`,
+                    )
+                    .toBe(testSet.expected[i][key]);
+            }
+        }
+    }
+});
+
+const TEST_DATA: TokenizationTestData[] = [
+    {
+        input: ["Hello World"],
+        expected: [
+            { line: 1, column: 1, text: "Hello" },
+            { line: 1, column: 7, text: "World" },
+        ],
+    },
+    {
+        input: ["Long     Gap"],
+        expected: [{ column: 1 }, { column: 10 }],
+    },
+    {
+        input: ["Multi", "Line"],
+        expected: [
+            { line: 1, column: 1 },
+            { line: 2, column: 1 },
+        ],
+    },
+    {
+        input: ["Gap at", "    line start"],
+        expected: [{ line: 1, column: 1 }, { line: 1 }, { line: 2, column: 5 }, { line: 2, column: 10 }],
+    },
+];
+
+interface TokenizationTestData {
+    input: string[];
+    /** For each token you only need to give the parameters you want to test for (e.g. only correct line). If you just test for the token being present an empty object can be given. */
+    expected: Partial<Token>[];
+}
diff --git a/frontend/webEditor/tsconfig.json b/frontend/webEditor/tsconfig.json
index ae41ac20..3f56368e 100644
--- a/frontend/webEditor/tsconfig.json
+++ b/frontend/webEditor/tsconfig.json
@@ -27,5 +27,5 @@
         "experimentalDecorators": true,
         "sourceMap": true
     },
-    "include": ["src"]
+    "include": ["src", "tests"]
 }
diff --git a/frontend/webEditor/vitest.config.ts b/frontend/webEditor/vitest.config.ts
new file mode 100644
index 00000000..9c2f0800
--- /dev/null
+++ b/frontend/webEditor/vitest.config.ts
@@ -0,0 +1,7 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+    test: {
+        setupFiles: ["./tests/languages/mockMonaco.ts"],
+    },
+});