diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8f8421f..74f63d6 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,11 +10,22 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: ./
+      - id: action-success-test
+        uses: ./
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-check
+          level: error
+          workdir: ./testdata
+          biome_flags: ok
+      - id: action-failure-test
+        uses: ./
         with:
           github_token: ${{ secrets.github_token }}
           reporter: github-check
           level: info
+          workdir: ./testdata
+          biome_flags: error
 
   test-pr-check:
     if: github.event_name == 'pull_request'
@@ -22,12 +33,22 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: ./
+      - id: action-success-test
+        uses: ./
         with:
           github_token: ${{ secrets.github_token }}
           reporter: github-pr-check
-          level: warning
-          workdir: ./testdata/subdir/
+          level: error
+          workdir: ./testdata
+          biome_flags: ok
+      - id: action-failure-test
+        uses: ./
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-pr-check
+          level: info
+          workdir: ./testdata
+          biome_flags: error
 
   test-pr-review:
     if: github.event_name == 'pull_request'
@@ -35,14 +56,19 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: ./
-        continue-on-error: true
+      - id: action-success-test
+        uses: ./
         with:
           github_token: ${{ secrets.github_token }}
           reporter: github-pr-review
           level: error
-          filter_mode: file
-          fail_on_error: true
-      - name: check the exit code
-        if: ${{ !success() }}
-        run: echo 'The previous step should fail' && exit 1
+          workdir: ./testdata
+          biome_flags: ok
+      - id: action-failure-test
+        uses: ./
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-pr-check
+          level: info
+          workdir: ./testdata
+          biome_flags: error
diff --git a/.gitignore b/.gitignore
index bfbf135..223480a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 # Folders to ignore
 .vscode/
 .idea/
+node_modules/
diff --git a/script.sh b/script.sh
index 2287cf7..8463747 100755
--- a/script.sh
+++ b/script.sh
@@ -7,17 +7,21 @@ fi
 
 export REVIEWDOG_GITHUB_API_TOKEN="${INPUT_GITHUB_TOKEN}"
 
-npx --no-install -c 'biome --version'
-if [ $? -ne 0 ]; then
-  echo '::group::🐶 Installing biome...'
+if [ ! -f "$(npm root)"/.bin/biome ]; then
+  echo '::group::🐶 Installing Biome...'
   npm install
   echo '::endgroup::'
 fi
 
-echo "biome version:$(npx --noinstall -c 'biome --version')}"
+if [ ! -f "$(npm root)"/.bin/biome ]; then
+  echo "❌ Unable to locate or install Biome. Did you provide a workdir which contains a valid package.json?"
+  exit 1
+fi
+
+echo "Biome $("$(npm root)"/.bin/biome --version)"
 
-echo '::group:: Running biome with reviewdog 🐶 ...'
-biome ci "${INPUT_BIOME_FLAGS}" |
+echo '::group:: Running Biome with reviewdog 🐶 ...'
+"$(npm root)"/.bin/biome ci "${INPUT_BIOME_FLAGS}" |
   reviewdog \
     -efm="%E%f:%l:%c %m ━%r" \
     -efm="%C" \
diff --git a/testdata/error/format.css b/testdata/error/format.css
new file mode 100644
index 0000000..cee98d0
--- /dev/null
+++ b/testdata/error/format.css
@@ -0,0 +1,5 @@
+html {}
+
+div { color: white;}
+
+div { color: white; background-color: red;}
diff --git a/testdata/error/format.js b/testdata/error/format.js
new file mode 100644
index 0000000..1d8d5cb
--- /dev/null
+++ b/testdata/error/format.js
@@ -0,0 +1,5 @@
+let a = [,];
+let b = [,,];
+let c = [,,1,];
+let d = [,,1,1];
+let e = [2,2,1,3];
diff --git a/testdata/error/lint.css b/testdata/error/lint.css
new file mode 100644
index 0000000..25ef0cd
--- /dev/null
+++ b/testdata/error/lint.css
@@ -0,0 +1,3 @@
+@font-face foo {}
+@font-face foo;
+@font-face ;
diff --git a/testdata/error/lint.js b/testdata/error/lint.js
new file mode 100644
index 0000000..94f74a8
--- /dev/null
+++ b/testdata/error/lint.js
@@ -0,0 +1,5 @@
+[a a, ++b, ] = test;
+[a, c, ...rest,] = test;
+[a = , = "test"] = test;
+[[a b] [c]]= test;
+[a: b] = c
diff --git a/testdata/ok/format.css b/testdata/ok/format.css
new file mode 100644
index 0000000..aec135d
--- /dev/null
+++ b/testdata/ok/format.css
@@ -0,0 +1,11 @@
+html {
+}
+
+div {
+  color: white;
+}
+
+div {
+  color: white;
+  background-color: red;
+}
diff --git a/testdata/ok/format.js b/testdata/ok/format.js
new file mode 100644
index 0000000..04629da
--- /dev/null
+++ b/testdata/ok/format.js
@@ -0,0 +1,5 @@
+let a = [,];
+let b = [, ,];
+let c = [, , 1];
+let d = [, , 1, 1];
+let e = [2, 2, 1, 3];
diff --git a/testdata/ok/lint.css b/testdata/ok/lint.css
new file mode 100644
index 0000000..31d36c7
--- /dev/null
+++ b/testdata/ok/lint.css
@@ -0,0 +1 @@
+@font-face {}
diff --git a/testdata/ok/lint.js b/testdata/ok/lint.js
new file mode 100644
index 0000000..458c13e
--- /dev/null
+++ b/testdata/ok/lint.js
@@ -0,0 +1,4 @@
+[foo, bar] = baz;
+[,,,b,,c,] = baz;
+[a = "test", a.b, call().b] = baz;
+[((a))] = baz;
diff --git a/testdata/package-lock.json b/testdata/package-lock.json
new file mode 100644
index 0000000..7055b17
--- /dev/null
+++ b/testdata/package-lock.json
@@ -0,0 +1,137 @@
+{
+  "name": "testdata",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "testdata",
+      "version": "1.0.0",
+      "license": "MIT",
+      "devDependencies": {
+        "@biomejs/biome": "1.4.1"
+      }
+    },
+    "node_modules/@biomejs/biome": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/@biomejs/biome/-/biome-1.4.1.tgz",
+      "integrity": "sha512-JccVAwPbhi37pdxbAGmaOBjUTKEwEjWAhl7rKkVVuXHo4MLASXJ5HR8BTgrImi4/7rTBsGz1tgVD1Kwv1CHGRg==",
+      "dev": true,
+      "hasInstallScript": true,
+      "bin": {
+        "biome": "bin/biome"
+      },
+      "engines": {
+        "node": ">=14.*"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/biome"
+      },
+      "optionalDependencies": {
+        "@biomejs/cli-darwin-arm64": "1.4.1",
+        "@biomejs/cli-darwin-x64": "1.4.1",
+        "@biomejs/cli-linux-arm64": "1.4.1",
+        "@biomejs/cli-linux-x64": "1.4.1",
+        "@biomejs/cli-win32-arm64": "1.4.1",
+        "@biomejs/cli-win32-x64": "1.4.1"
+      }
+    },
+    "node_modules/@biomejs/cli-darwin-arm64": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-darwin-arm64/-/cli-darwin-arm64-1.4.1.tgz",
+      "integrity": "sha512-PZWy2Idndqux38p6AXSDQM2ldRAWi32bvb7bMbTN0ALzpWYMYnxd71ornatumSSJYoNhKmxzDLq+jct7nZJ79w==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=14.*"
+      }
+    },
+    "node_modules/@biomejs/cli-darwin-x64": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-darwin-x64/-/cli-darwin-x64-1.4.1.tgz",
+      "integrity": "sha512-soj3BWhnsM1M2JlzR09cibUzG1owJqetwj/Oo7yg0foijo9lNH9XWXZfJBYDKgW/6Fomn+CC2EcUS+hisQzt9g==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=14.*"
+      }
+    },
+    "node_modules/@biomejs/cli-linux-arm64": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-linux-arm64/-/cli-linux-arm64-1.4.1.tgz",
+      "integrity": "sha512-YIZqfJUg4F+fPsBTXxgD7EU2E5OAYbmYSl/snf4PevwfQCWE/omOFZv+NnIQmjYj9I7ParDgcJvanoA3/kO0JQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=14.*"
+      }
+    },
+    "node_modules/@biomejs/cli-linux-x64": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-linux-x64/-/cli-linux-x64-1.4.1.tgz",
+      "integrity": "sha512-9YOZw3qBd/KUj63A6Hn2zZgzGb2nbESM0qNmeMXgmqinVKM//uc4OgY5TuKITuGjMSvcVxxd4dX1IzYjV9qvNQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=14.*"
+      }
+    },
+    "node_modules/@biomejs/cli-win32-arm64": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-win32-arm64/-/cli-win32-arm64-1.4.1.tgz",
+      "integrity": "sha512-nWQbvkNKxYn/kCQ0yVF8kCaS3VzaGvtFSmItXiMknU4521LDjJ7tNWH12Gol+pIslrCbd4E1LhJa0a3ThRsBVg==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=14.*"
+      }
+    },
+    "node_modules/@biomejs/cli-win32-x64": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-win32-x64/-/cli-win32-x64-1.4.1.tgz",
+      "integrity": "sha512-88fR2CQxQ4YLs2BUDuywWYQpUKgU3A3sTezANFc/4LGKQFFLV2yX+F7QAdZVkMHfA+RD9Xg178HomM/6mnTNPA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=14.*"
+      }
+    }
+  }
+}
diff --git a/testdata/package.json b/testdata/package.json
new file mode 100644
index 0000000..9060332
--- /dev/null
+++ b/testdata/package.json
@@ -0,0 +1,10 @@
+{
+  "name": "testdata",
+  "version": "1.0.0",
+  "description": "Test data for the reviewdog-action-biome",
+  "author": "mongolyy",
+  "license": "MIT",
+  "devDependencies": {
+    "@biomejs/biome": "^1.4.1"
+  }
+}
diff --git a/testdata/subdir/text.md b/testdata/subdir/text.md
deleted file mode 100644
index 5b33346..0000000
--- a/testdata/subdir/text.md
+++ /dev/null
@@ -1,2 +0,0 @@
-Determinisitic result is important!
-
diff --git a/testdata/text.md b/testdata/text.md
deleted file mode 100644
index 5025db8..0000000
--- a/testdata/text.md
+++ /dev/null
@@ -1,5 +0,0 @@
-Determinisitic result is important.
-
-colour # <= Check -locale
-
-langauge