diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f8e55c9..410ca25 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,10 +7,12 @@ on:
 
 jobs:
   test:
-    name: Test (Node ${{ matrix.node-version }})
-    runs-on: ubuntu-latest
+    name: Test (Node ${{ matrix.node-version }}, ${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
+        os: [ubuntu-latest, windows-latest]
         node-version: [24, 25]
 
     steps:
@@ -34,3 +36,6 @@ jobs:
 
       - name: Build
         run: node --run build
+
+      - name: Run tests
+        run: node --run test
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 3eed112..a16ad22 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -26,6 +26,7 @@ jobs:
         uses: actions/setup-node@v6
         with:
           node-version: 25
+          check-latest: true
           registry-url: 'https://registry.npmjs.org'
 
       - name: Install dependencies
@@ -40,6 +41,9 @@ jobs:
       - name: Build
         run: node --run build
 
+      - name: Run tests
+        run: node --run test
+
       - name: Update version
         run: |
           git config user.name "${{ github.actor }}"
diff --git a/.gitignore b/.gitignore
index 1d69fdb..d4d011a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /.cache
 /dist
 /node_modules
+/coverage
diff --git a/README.md b/README.md
index 268e68e..9232ff1 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ The plugin does not process the CSS in any way whatsoever, it is merely output i
 
 ## Installation
 
-```
+```bash
 npm install -D ecij
 ```
 
@@ -133,9 +133,43 @@ ecij({
 });
 ```
 
+## Development
+
+### Building
+
+```bash
+npm run build
+```
+
+### Formatting
+
+```bash
+npm run format
+```
+
+### Type Checking
+
+```bash
+npm run typecheck
+```
+
+### Running Tests
+
+The project uses **integration tests** with **inline snapshot testing** to validate transformations.
+
+```bash
+# Run tests once
+npm test
+
+# Run tests with coverage
+npm run test:coverage
+
+# Update inline snapshots after intentional changes
+npm test -- -u
+```
+
 ## TODO
 
-- Tests
 - Scope handling
 - Validate that the `css` used refers to the ecij export
 - Full import/export handling (default/namespace import/export)
diff --git a/package-lock.json b/package-lock.json
index d13dfac..fa35e50 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,15 +9,18 @@
       "version": "0.2.0",
       "license": "MIT",
       "dependencies": {
-        "@rolldown/pluginutils": "^1.0.0-beta.50",
+        "@rolldown/pluginutils": "^1.0.0-beta.51",
         "oxc-parser": "^0.98.0"
       },
       "devDependencies": {
         "@types/node": "^24.10.1",
+        "@vitest/coverage-v8": "^4.0.13",
         "prettier": "^3.6.2",
-        "rolldown": "^1.0.0-beta.50",
-        "rolldown-plugin-dts": "^0.17.8",
-        "typescript": "^5.9.3"
+        "rolldown": "^1.0.0-beta.51",
+        "rolldown-plugin-dts": "^0.18.0",
+        "typescript": "^5.9.3",
+        "vite": "npm:rolldown-vite@^7.2.7",
+        "vitest": "^4.0.13"
       }
     },
     "node_modules/@babel/generator": {
@@ -87,6 +90,16 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@bcoe/v8-coverage": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz",
+      "integrity": "sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@emnapi/core": {
       "version": "1.7.1",
       "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.7.1.tgz",
@@ -409,6 +422,16 @@
         "node": "^20.19.0 || >=22.12.0"
       }
     },
+    "node_modules/@oxc-project/runtime": {
+      "version": "0.98.0",
+      "resolved": "https://registry.npmjs.org/@oxc-project/runtime/-/runtime-0.98.0.tgz",
+      "integrity": "sha512-F0ldlBv2orG2YqNL0w77deq9yCaO4zEHbanGnW/jaJxGBR8ImekvZb8x42zAHvdzr8J76psibijvHtXfSjbEIQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
     "node_modules/@oxc-project/types": {
       "version": "0.98.0",
       "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.98.0.tgz",
@@ -419,9 +442,9 @@
       }
     },
     "node_modules/@rolldown/binding-android-arm64": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.0.0-beta.50.tgz",
-      "integrity": "sha512-XlEkrOIHLyGT3avOgzfTFSjG+f+dZMw+/qd+Y3HLN86wlndrB/gSimrJCk4gOhr1XtRtEKfszpadI3Md4Z4/Ag==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.0.0-beta.51.tgz",
+      "integrity": "sha512-Ctn8FUXKWWQI9pWC61P1yumS9WjQtelNS9riHwV7oCkknPGaAry4o7eFx2KgoLMnI2BgFJYpW7Im8/zX3BuONg==",
       "cpu": [
         "arm64"
       ],
@@ -436,9 +459,9 @@
       }
     },
     "node_modules/@rolldown/binding-darwin-arm64": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-arm64/-/binding-darwin-arm64-1.0.0-beta.50.tgz",
-      "integrity": "sha512-+JRqKJhoFlt5r9q+DecAGPLZ5PxeLva+wCMtAuoFMWPoZzgcYrr599KQ+Ix0jwll4B4HGP43avu9My8KtSOR+w==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-arm64/-/binding-darwin-arm64-1.0.0-beta.51.tgz",
+      "integrity": "sha512-EL1aRW2Oq15ShUEkBPsDtLMO8GTqfb/ktM/dFaVzXKQiEE96Ss6nexMgfgQrg8dGnNpndFyffVDb5IdSibsu1g==",
       "cpu": [
         "arm64"
       ],
@@ -453,9 +476,9 @@
       }
     },
     "node_modules/@rolldown/binding-darwin-x64": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-x64/-/binding-darwin-x64-1.0.0-beta.50.tgz",
-      "integrity": "sha512-fFXDjXnuX7/gQZQm/1FoivVtRcyAzdjSik7Eo+9iwPQ9EgtA5/nB2+jmbzaKtMGG3q+BnZbdKHCtOacmNrkIDA==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-x64/-/binding-darwin-x64-1.0.0-beta.51.tgz",
+      "integrity": "sha512-uGtYKlFen9pMIPvkHPWZVDtmYhMQi5g5Ddsndg1gf3atScKYKYgs5aDP4DhHeTwGXQglhfBG7lEaOIZ4UAIWww==",
       "cpu": [
         "x64"
       ],
@@ -470,9 +493,9 @@
       }
     },
     "node_modules/@rolldown/binding-freebsd-x64": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-freebsd-x64/-/binding-freebsd-x64-1.0.0-beta.50.tgz",
-      "integrity": "sha512-F1b6vARy49tjmT/hbloplzgJS7GIvwWZqt+tAHEstCh0JIh9sa8FAMVqEmYxDviqKBaAI8iVvUREm/Kh/PD26Q==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-freebsd-x64/-/binding-freebsd-x64-1.0.0-beta.51.tgz",
+      "integrity": "sha512-JRoVTQtHYbZj1P07JLiuTuXjiBtIa7ag7/qgKA6CIIXnAcdl4LrOf7nfDuHPJcuRKaP5dzecMgY99itvWfmUFQ==",
       "cpu": [
         "x64"
       ],
@@ -487,9 +510,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-arm-gnueabihf": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.0.0-beta.50.tgz",
-      "integrity": "sha512-U6cR76N8T8M6lHj7EZrQ3xunLPxSvYYxA8vJsBKZiFZkT8YV4kjgCO3KwMJL0NOjQCPGKyiXO07U+KmJzdPGRw==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.0.0-beta.51.tgz",
+      "integrity": "sha512-BKATVnpPZ0TYBW9XfDwyd4kPGgvf964HiotIwUgpMrFOFYWqpZ+9ONNzMV4UFAYC7Hb5C2qgYQk/qj2OnAd4RQ==",
       "cpu": [
         "arm"
       ],
@@ -504,9 +527,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-arm64-gnu": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.0.0-beta.50.tgz",
-      "integrity": "sha512-ONgyjofCrrE3bnh5GZb8EINSFyR/hmwTzZ7oVuyUB170lboza1VMCnb8jgE6MsyyRgHYmN8Lb59i3NKGrxrYjw==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.0.0-beta.51.tgz",
+      "integrity": "sha512-xLd7da5jkfbVsBCm1buIRdWtuXY8+hU3+6ESXY/Tk5X5DPHaifrUblhYDgmA34dQt6WyNC2kfXGgrduPEvDI6Q==",
       "cpu": [
         "arm64"
       ],
@@ -521,9 +544,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-arm64-musl": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.0.0-beta.50.tgz",
-      "integrity": "sha512-L0zRdH2oDPkmB+wvuTl+dJbXCsx62SkqcEqdM+79LOcB+PxbAxxjzHU14BuZIQdXcAVDzfpMfaHWzZuwhhBTcw==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.0.0-beta.51.tgz",
+      "integrity": "sha512-EQFXTgHxxTzv3t5EmjUP/DfxzFYx9sMndfLsYaAY4DWF6KsK1fXGYsiupif6qPTViPC9eVmRm78q0pZU/kuIPg==",
       "cpu": [
         "arm64"
       ],
@@ -538,9 +561,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-x64-gnu": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-gnu/-/binding-linux-x64-gnu-1.0.0-beta.50.tgz",
-      "integrity": "sha512-gyoI8o/TGpQd3OzkJnh1M2kxy1Bisg8qJ5Gci0sXm9yLFzEXIFdtc4EAzepxGvrT2ri99ar5rdsmNG0zP0SbIg==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-gnu/-/binding-linux-x64-gnu-1.0.0-beta.51.tgz",
+      "integrity": "sha512-p5P6Xpa68w3yFaAdSzIZJbj+AfuDnMDqNSeglBXM7UlJT14Q4zwK+rV+8Mhp9MiUb4XFISZtbI/seBprhkQbiQ==",
       "cpu": [
         "x64"
       ],
@@ -555,9 +578,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-x64-musl": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-musl/-/binding-linux-x64-musl-1.0.0-beta.50.tgz",
-      "integrity": "sha512-zti8A7M+xFDpKlghpcCAzyOi+e5nfUl3QhU023ce5NCgUxRG5zGP2GR9LTydQ1rnIPwZUVBWd4o7NjZDaQxaXA==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-musl/-/binding-linux-x64-musl-1.0.0-beta.51.tgz",
+      "integrity": "sha512-sNVVyLa8HB8wkFipdfz1s6i0YWinwpbMWk5hO5S+XAYH2UH67YzUT13gs6wZTKg2x/3gtgXzYnHyF5wMIqoDAw==",
       "cpu": [
         "x64"
       ],
@@ -572,9 +595,9 @@
       }
     },
     "node_modules/@rolldown/binding-openharmony-arm64": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-openharmony-arm64/-/binding-openharmony-arm64-1.0.0-beta.50.tgz",
-      "integrity": "sha512-eZUssog7qljrrRU9Mi0eqYEPm3Ch0UwB+qlWPMKSUXHNqhm3TvDZarJQdTevGEfu3EHAXJvBIe0YFYr0TPVaMA==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-openharmony-arm64/-/binding-openharmony-arm64-1.0.0-beta.51.tgz",
+      "integrity": "sha512-e/JMTz9Q8+T3g/deEi8DK44sFWZWGKr9AOCW5e8C8SCVWzAXqYXAG7FXBWBNzWEZK0Rcwo9TQHTQ9Q0gXgdCaA==",
       "cpu": [
         "arm64"
       ],
@@ -589,9 +612,9 @@
       }
     },
     "node_modules/@rolldown/binding-wasm32-wasi": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-wasm32-wasi/-/binding-wasm32-wasi-1.0.0-beta.50.tgz",
-      "integrity": "sha512-nmCN0nIdeUnmgeDXiQ+2HU6FT162o+rxnF7WMkBm4M5Ds8qTU7Dzv2Wrf22bo4ftnlrb2hKK6FSwAJSAe2FWLg==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-wasm32-wasi/-/binding-wasm32-wasi-1.0.0-beta.51.tgz",
+      "integrity": "sha512-We3LWqSu6J9s5Y0MK+N7fUiiu37aBGPG3Pc347EoaROuAwkCS2u9xJ5dpIyLW4B49CIbS3KaPmn4kTgPb3EyPw==",
       "cpu": [
         "wasm32"
       ],
@@ -606,9 +629,9 @@
       }
     },
     "node_modules/@rolldown/binding-win32-arm64-msvc": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-arm64-msvc/-/binding-win32-arm64-msvc-1.0.0-beta.50.tgz",
-      "integrity": "sha512-7kcNLi7Ua59JTTLvbe1dYb028QEPaJPJQHqkmSZ5q3tJueUeb6yjRtx8mw4uIqgWZcnQHAR3PrLN4XRJxvgIkA==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-arm64-msvc/-/binding-win32-arm64-msvc-1.0.0-beta.51.tgz",
+      "integrity": "sha512-fj56buHRuMM+r/cb6ZYfNjNvO/0xeFybI6cTkTROJatdP4fvmQ1NS8D/Lm10FCSDEOkqIz8hK3TGpbAThbPHsA==",
       "cpu": [
         "arm64"
       ],
@@ -623,9 +646,9 @@
       }
     },
     "node_modules/@rolldown/binding-win32-ia32-msvc": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-ia32-msvc/-/binding-win32-ia32-msvc-1.0.0-beta.50.tgz",
-      "integrity": "sha512-lL70VTNvSCdSZkDPPVMwWn/M2yQiYvSoXw9hTLgdIWdUfC3g72UaruezusR6ceRuwHCY1Ayu2LtKqXkBO5LIwg==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-ia32-msvc/-/binding-win32-ia32-msvc-1.0.0-beta.51.tgz",
+      "integrity": "sha512-fkqEqaeEx8AySXiDm54b/RdINb3C0VovzJA3osMhZsbn6FoD73H0AOIiaVAtGr6x63hefruVKTX8irAm4Jkt2w==",
       "cpu": [
         "ia32"
       ],
@@ -640,9 +663,9 @@
       }
     },
     "node_modules/@rolldown/binding-win32-x64-msvc": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-x64-msvc/-/binding-win32-x64-msvc-1.0.0-beta.50.tgz",
-      "integrity": "sha512-4qU4x5DXWB4JPjyTne/wBNPqkbQU8J45bl21geERBKtEittleonioACBL1R0PsBu0Aq21SwMK5a9zdBkWSlQtQ==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-x64-msvc/-/binding-win32-x64-msvc-1.0.0-beta.51.tgz",
+      "integrity": "sha512-CWuLG/HMtrVcjKGa0C4GnuxONrku89g0+CsH8nT0SNhOtREXuzwgjIXNJImpE/A/DMf9JF+1Xkrq/YRr+F/rCg==",
       "cpu": [
         "x64"
       ],
@@ -657,9 +680,16 @@
       }
     },
     "node_modules/@rolldown/pluginutils": {
-      "version": "1.0.0-beta.50",
-      "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.0-beta.50.tgz",
-      "integrity": "sha512-5e76wQiQVeL1ICOZVUg4LSOVYg9jyhGCin+icYozhsUzM+fHE7kddi1bdiE0jwVqTfkjba3jUFbEkoC9WkdvyA==",
+      "version": "1.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.0-beta.51.tgz",
+      "integrity": "sha512-51/8cNXMrqWqX3o8DZidhwz1uYq0BhHDDSfVygAND1Skx5s1TDw3APSSxCMcFFedwgqGcx34gRouwY+m404BBQ==",
+      "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==",
+      "dev": true,
       "license": "MIT"
     },
     "node_modules/@tybys/wasm-util": {
@@ -672,6 +702,31 @@
         "tslib": "^2.4.0"
       }
     },
+    "node_modules/@types/chai": {
+      "version": "5.2.3",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-5.2.3.tgz",
+      "integrity": "sha512-Mw558oeA9fFbv65/y4mHtXDs9bPnFMZAL/jxdPFUpOHHIXX91mcgEHbS5Lahr+pwZFR8A7GQleRWeI6cGFC2UA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/deep-eql": "*",
+        "assertion-error": "^2.0.1"
+      }
+    },
+    "node_modules/@types/deep-eql": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/@types/deep-eql/-/deep-eql-4.0.2.tgz",
+      "integrity": "sha512-c9h9dVVMigMPc4bwTvC5dxqtqJZwQPePsWjPlpSOnojbor6pGqdk541lfA7AqFQr5pB1BRdq0juY9db81BwyFw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/estree": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.8.tgz",
+      "integrity": "sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/node": {
       "version": "24.10.1",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-24.10.1.tgz",
@@ -682,224 +737,242 @@
         "undici-types": "~7.16.0"
       }
     },
-    "node_modules/ast-kit": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/ast-kit/-/ast-kit-2.2.0.tgz",
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+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/debug": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
+      }
+    },
+    "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"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 992a4da..9d481dd 100644
--- a/package.json
+++ b/package.json
@@ -36,17 +36,25 @@
     "build": "rolldown -c",
     "format": "prettier --write .",
     "format:check": "prettier --check .",
-    "typecheck": "tsc --build"
+    "typecheck": "tsc --build",
+    "test": "vitest run",
+    "test:coverage": "vitest run --coverage"
   },
   "dependencies": {
-    "@rolldown/pluginutils": "^1.0.0-beta.50",
+    "@rolldown/pluginutils": "^1.0.0-beta.51",
     "oxc-parser": "^0.98.0"
   },
   "devDependencies": {
     "@types/node": "^24.10.1",
+    "@vitest/coverage-v8": "^4.0.13",
     "prettier": "^3.6.2",
-    "rolldown": "^1.0.0-beta.50",
-    "rolldown-plugin-dts": "^0.17.8",
-    "typescript": "^5.9.3"
+    "rolldown": "^1.0.0-beta.51",
+    "rolldown-plugin-dts": "^0.18.0",
+    "typescript": "^5.9.3",
+    "vite": "npm:rolldown-vite@^7.2.7",
+    "vitest": "^4.0.13"
+  },
+  "overrides": {
+    "vite": "$vite"
   }
 }
diff --git a/test/fixtures/basic.input.ts b/test/fixtures/basic.input.ts
new file mode 100644
index 0000000..c587a42
--- /dev/null
+++ b/test/fixtures/basic.input.ts
@@ -0,0 +1,6 @@
+import { css } from 'ecij';
+
+export const basicClass = css`
+  border: 1px solid blue;
+  padding: 10px;
+`;
diff --git a/test/fixtures/complex-interpolation.input.ts b/test/fixtures/complex-interpolation.input.ts
new file mode 100644
index 0000000..0e2dae8
--- /dev/null
+++ b/test/fixtures/complex-interpolation.input.ts
@@ -0,0 +1,7 @@
+import { css } from 'ecij';
+
+// This has a complex expression (ternary) that cannot be resolved statically
+export const dynamicClass = css`
+  color: ${Math.random() > 0.5 ? 'red' : 'blue'};
+  padding: 10px;
+`;
diff --git a/test/fixtures/comprehensive.input.ts b/test/fixtures/comprehensive.input.ts
new file mode 100644
index 0000000..ddcee7d
--- /dev/null
+++ b/test/fixtures/comprehensive.input.ts
@@ -0,0 +1,57 @@
+import { css } from 'ecij';
+import { bgColor as background, redClass } from './imported-style';
+
+// Basic CSS transformation
+export const buttonClass = css`
+  /* button */
+  border: 1px solid blue;
+  padding: 10px;
+`;
+
+// Multiple declarations
+export const primaryClass = css`
+  /* primary */
+  color: blue;
+`;
+
+export const secondaryClass = css`
+  /* secondary */
+  color: green;
+`;
+
+// Local variable interpolation
+const baseColor = 'red';
+
+const highlightedClass = css`
+  /* highlighted */
+  color: ${baseColor};
+`;
+
+// Imported variable and class name interpolation
+export const importedClass = css`
+  /* imported */
+  background: ${background};
+
+  &.${redClass} {
+    border-color: red;
+  }
+`;
+
+// Nested local interpolation
+export const nestedClass = css`
+  /* nested */
+  background: gray;
+
+  &.${highlightedClass} {
+    color: ${baseColor};
+  }
+`;
+
+// Inline CSS (not assigned to variable)
+export function getButtonClass() {
+  return css`
+    /* inline css */
+    background: blue;
+    padding: 8px 16px;
+  `;
+}
diff --git a/test/fixtures/fake.ts b/test/fixtures/fake.ts
new file mode 100644
index 0000000..837db1b
--- /dev/null
+++ b/test/fixtures/fake.ts
@@ -0,0 +1,3 @@
+export function css(_: TemplateStringsArray) {
+  return '';
+}
diff --git a/test/fixtures/identical-first.ts b/test/fixtures/identical-first.ts
new file mode 100644
index 0000000..7b58850
--- /dev/null
+++ b/test/fixtures/identical-first.ts
@@ -0,0 +1,5 @@
+import { css } from 'ecij';
+
+export const myClass = css`
+  color: green;
+`;
diff --git a/test/fixtures/identical-second.ts b/test/fixtures/identical-second.ts
new file mode 100644
index 0000000..7b58850
--- /dev/null
+++ b/test/fixtures/identical-second.ts
@@ -0,0 +1,5 @@
+import { css } from 'ecij';
+
+export const myClass = css`
+  color: green;
+`;
diff --git a/test/fixtures/identical.input.ts b/test/fixtures/identical.input.ts
new file mode 100644
index 0000000..216216a
--- /dev/null
+++ b/test/fixtures/identical.input.ts
@@ -0,0 +1,2 @@
+export { myClass as firstClass } from './identical-first';
+export { myClass as secondClass } from './identical-second';
diff --git a/test/fixtures/imported-style.ts b/test/fixtures/imported-style.ts
new file mode 100644
index 0000000..82758f3
--- /dev/null
+++ b/test/fixtures/imported-style.ts
@@ -0,0 +1,11 @@
+import { css } from 'ecij';
+
+const red = 'red';
+
+const backgroundColor = 'white';
+
+export const redClass = css`
+  color: ${red};
+`;
+
+export { backgroundColor as bgColor };
diff --git a/test/fixtures/no-ecij.input.ts b/test/fixtures/no-ecij.input.ts
new file mode 100644
index 0000000..cb590fa
--- /dev/null
+++ b/test/fixtures/no-ecij.input.ts
@@ -0,0 +1,7 @@
+// File without any ecij usage
+import { css } from './fake';
+
+export const buttonClass = css`
+  color: blue;
+  padding: 10px;
+`;
diff --git a/test/plugin.test.ts b/test/plugin.test.ts
new file mode 100644
index 0000000..b88c98b
--- /dev/null
+++ b/test/plugin.test.ts
@@ -0,0 +1,190 @@
+import { rolldown } from 'rolldown';
+import { expect, test } from 'vitest';
+import { ecij, type Configuration } from '../src/index';
+
+// Helper to run a rolldown build with the ecij plugin
+async function buildWithPlugin(input: string, pluginOptions?: Configuration) {
+  const build = await rolldown({
+    input,
+    plugins: [ecij(pluginOptions)],
+  });
+
+  const { output } = await build.generate();
+
+  // Extract JS and CSS outputs
+  const jsChunk = output.find((chunk) => chunk.type === 'chunk');
+  const cssChunk = output.find((chunk) => chunk.type === 'asset');
+
+  return {
+    js: jsChunk?.code,
+    css: cssChunk?.source,
+  };
+}
+
+test('comprehensive CSS-in-JS patterns', async () => {
+  const fixturePath = import.meta.resolve('./fixtures/comprehensive.input.ts');
+  const result = await buildWithPlugin(fixturePath);
+
+  // Comprehensive fixture includes:
+  // - Basic CSS extraction
+  // - Multiple declarations
+  // - Local variable interpolation
+  // - Imported class name interpolation
+  // - Nested interpolations
+  // - Inline CSS (not assigned to variable)
+  // TODO:
+  // - preserve redClass in the CSS output
+  expect(result.js).toMatchInlineSnapshot(`
+    "//#region test/fixtures/comprehensive.input.ts
+    const buttonClass = "css-39ccb25d";
+    const primaryClass = "css-7a998145";
+    const secondaryClass = "css-6c03a746";
+    const importedClass = "css-873c0af7";
+    const nestedClass = "css-558a1973";
+    function getButtonClass() {
+    	return "css-05de2aa1";
+    }
+
+    //#endregion
+    export { buttonClass, getButtonClass, importedClass, nestedClass, primaryClass, secondaryClass };"
+  `);
+  expect(result.css).toMatchInlineSnapshot(`
+    ".css-39ccb25d {
+      /* button */
+      border: 1px solid blue;
+      padding: 10px;
+    }
+
+    .css-7a998145 {
+      /* primary */
+      color: blue;
+    }
+
+    .css-6c03a746 {
+      /* secondary */
+      color: green;
+    }
+
+    .css-51df74aa {
+      /* highlighted */
+      color: red;
+    }
+
+    .css-873c0af7 {
+      /* imported */
+      background: white;
+
+      &.css-348273b1 {
+        border-color: red;
+      }
+    }
+
+    .css-558a1973 {
+      /* nested */
+      background: gray;
+
+      &.css-51df74aa {
+        color: red;
+      }
+    }
+
+    .css-05de2aa1 {
+      /* inline css */
+        background: blue;
+        padding: 8px 16px;
+    }
+    "
+  `);
+});
+
+test('generate hash based on file path relative to root and file name to avoid name conflicts', async () => {
+  const fixturePath = import.meta.resolve('./fixtures/identical.input.ts');
+  const result = await buildWithPlugin(fixturePath);
+
+  expect(result.js).toMatchInlineSnapshot(`
+    "//#region test/fixtures/identical-first.ts
+    const myClass = "css-3f848070";
+
+    //#endregion
+    //#region test/fixtures/identical-second.ts
+    const myClass$1 = "css-5a57e4d1";
+
+    //#endregion
+    export { myClass as firstClass, myClass$1 as secondClass };"
+  `);
+  expect(result.css).toMatchInlineSnapshot(`
+    ".css-3f848070 {
+      color: green;
+    }
+    .css-5a57e4d1 {
+      color: green;
+    }
+    "
+  `);
+});
+
+// TODO
+test.fails('ignore non-ecij css tag functions', async () => {
+  const fixturePath = import.meta.resolve('./fixtures/no-ecij.input.ts');
+  const result = await buildWithPlugin(fixturePath);
+
+  expect(result.js).toMatchInlineSnapshot(`
+    "//#region test/fixtures/no-ecij.input.ts
+    const buttonClass = "css-25e9670b";
+
+    //#endregion
+    export { buttonClass };"
+  `);
+
+  // No CSS should be generated
+  expect(result.css).toBeUndefined();
+});
+
+test('skip css blocks with complex interpolations', async () => {
+  const fixturePath = import.meta.resolve(
+    './fixtures/complex-interpolation.input.ts',
+  );
+  const result = await buildWithPlugin(fixturePath);
+
+  expect(result.js).toMatchInlineSnapshot(`
+    "//#region index.js
+    function css() {
+    	throw new Error("css\`\` should have been transformed by the ecij plugin");
+    }
+
+    //#endregion
+    //#region test/fixtures/complex-interpolation.input.ts
+    const dynamicClass = css\`
+      color: \${Math.random() > .5 ? "red" : "blue"};
+      padding: 10px;
+    \`;
+
+    //#endregion
+    export { dynamicClass };"
+  `);
+
+  // CSS blocks with complex expressions are skipped
+  expect(result.css).toBeUndefined();
+});
+
+test('classPrefix setting', async () => {
+  const fixturePath = import.meta.resolve('./fixtures/basic.input.ts');
+  const result = await buildWithPlugin(fixturePath, {
+    classPrefix: 'custom_',
+  });
+
+  expect(result.js).toMatchInlineSnapshot(`
+    "//#region test/fixtures/basic.input.ts
+    const basicClass = "custom_90f511d6";
+
+    //#endregion
+    export { basicClass };"
+  `);
+  expect(result.css).toMatchInlineSnapshot(`
+    ".custom_90f511d6 {
+      border: 1px solid blue;
+      padding: 10px;
+    }
+    "
+  `);
+});
diff --git a/tsconfig.json b/tsconfig.json
index 563f28f..49875e6 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,6 +2,7 @@
   "include": [],
   "references": [
     { "path": "tsconfig.src.json" },
+    { "path": "tsconfig.test.json" },
     { "path": "tsconfig.tools.json" }
   ]
 }
diff --git a/tsconfig.test.json b/tsconfig.test.json
new file mode 100644
index 0000000..c7a94ba
--- /dev/null
+++ b/tsconfig.test.json
@@ -0,0 +1,9 @@
+{
+  "extends": "./tsconfig.base.json",
+  "compilerOptions": {
+    "isolatedDeclarations": false,
+    "types": ["node"]
+  },
+  "include": ["test/**/*"],
+  "references": [{ "path": "tsconfig.src.json" }]
+}
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..c82064d
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,10 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    include: ['test/**/*.test.ts'],
+    coverage: {
+      reporter: ['text', 'json', 'html'],
+    },
+  },
+});