diff --git a/test/npm/README.md b/test/npm/README.md
index 7a200f8..3d8f364 100644
--- a/test/npm/README.md
+++ b/test/npm/README.md
@@ -8,6 +8,7 @@ Composite action: install dependencies and run an npm test script.
 |---|---|---|
 | `INSTALL_CMD` | Install command | `npm ci` |
 | `TEST_SCRIPT` | npm script to run (must exist in `package.json`) | `test` |
+| `TEST_ARGS` | Additional arguments passed after `--` to the test script | `` |
 | `WORKING_DIRECTORY` | Directory to run commands in | `.` |
 
 ## Usage
@@ -18,6 +19,15 @@ Composite action: install dependencies and run an npm test script.
     TEST_SCRIPT: test:unit
 ```
 
+With extra args:
+
+```yaml
+- uses: stat-tackler/stat-tackler-infra/test/npm@main
+  with:
+    TEST_SCRIPT: test:coverage
+    TEST_ARGS: --silent --reporter=dot --test-timeout=30000
+```
+
 ### Common test scripts by project
 
 | Project | Script | Runner |
diff --git a/test/npm/action.yml b/test/npm/action.yml
index 28352a0..eb9992c 100644
--- a/test/npm/action.yml
+++ b/test/npm/action.yml
@@ -8,6 +8,9 @@ inputs:
   TEST_SCRIPT:
     description: "npm script to run (must exist in package.json)"
     default: "test"
+  TEST_ARGS:
+    description: "Additional arguments to pass after -- to the test script"
+    default: ""
   WORKING_DIRECTORY:
     description: "Directory to run commands in"
     default: "."
@@ -37,4 +40,4 @@ runs:
     - name: Test
       shell: sh
       working-directory: ${{ inputs.WORKING_DIRECTORY }}
-      run: npm run ${{ inputs.TEST_SCRIPT }}
+      run: npm run ${{ inputs.TEST_SCRIPT }}${{ inputs.TEST_ARGS != '' && format(' -- {0}', inputs.TEST_ARGS) || '' }}