diff --git a/.github/actions/setup-docker/action.yml b/.github/actions/setup-docker/action.yml
new file mode 100644
index 0000000..c4e1f7d
--- /dev/null
+++ b/.github/actions/setup-docker/action.yml
@@ -0,0 +1,13 @@
+name: "Setup Docker"
+description: "Use the local Dockerfile to test the action instead of the one on DockerHub"
+
+runs: 
+  using: "composite"
+  steps:
+    - name: Replace image on action.yml
+      shell: bash
+      env:
+        ESC_DOCKER_IMAGE_LINK: 'docker\:\/\/sentryintegrations\/sentry-github-action-release\:latest'
+      run: | 
+        mv action.yml previous.yml 
+        sed "s/$ESC_DOCKER_IMAGE_LINK/Dockerfile/" previous.yml >> action.yml
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 911a11a..be69a24 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,5 +1,5 @@
 name: "test"
-on: # rebuild any PRs and main branch changes
+on:
   pull_request:
   push:
     branches:
@@ -7,16 +7,14 @@ on: # rebuild any PRs and main branch changes
       - 'releases/*'
 
 jobs:
-  test: # make sure the action works on a clean machine without building
+  mock: # Make sure that the action works on a clean machine without building
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - name: Create Sentry release
+    - uses: actions/checkout@v3
+    - uses: './.github/actions/setup-docker'
+    - name: Mock creating a Sentry release
       uses: ./
       env:
-        SENTRY_AUTH_TOKEN: ${{ secrets.SENTRY_AUTH_TOKEN }}
-        SENTRY_ORG: ${{ secrets.SENTRY_ORG }}
-        SENTRY_PROJECT: ${{ secrets.SENTRY_PROJECT }}
         MOCK: true
       with:
         environment: production
diff --git a/CONTRIBUTING b/CONTRIBUTING
index ca4c742..c85e6fa 100644
--- a/CONTRIBUTING
+++ b/CONTRIBUTING
@@ -1,4 +1,4 @@
 # Contributing
 Feel free to use GitHub's pull request features to propose changes.
 
-See the [Code of Conduct](https://github.com/getsentry/.github/blob/master/CODE_OF_CONDUCT.md).
+See the [Code of Conduct](https://github.com/getsentry/.github/blob/main/CODE_OF_CONDUCT.md).
diff --git a/src/cli.ts b/src/cli.ts
index e3831ae..2a8aa1a 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -15,6 +15,14 @@ export const getCLI = (): SentryCliReleases => {
   if (!cli) {
     cli = new SentryCli().releases;
     if (process.env['MOCK']) {
+      // Set environment variables if they aren't already
+      for (const variable of [
+        'SENTRY_AUTH_TOKEN',
+        'SENTRY_ORG',
+        'SENTRY_PROJECT',
+      ])
+        !(variable in process.env) && (process.env[variable] = variable);
+
       cli.execute = async (
         args: string[],
         // eslint-disable-next-line @typescript-eslint/no-unused-vars