diff --git a/src/index.test.js b/src/index.test.js
index 3027560..d55ddb2 100644
--- a/src/index.test.js
+++ b/src/index.test.js
@@ -22,6 +22,11 @@ describe('with all environment variables set', () => {
     process.env.GITHUB_ACTION_PATH = 'something'
   })
 
+  afterEach(() => {
+    // Remove mock for `core.getInput('preview')`
+    delete process.env.INPUT_PREVIEW
+  })
+
   it('Executes cleanly', done => {
     const ip = path.join(__dirname, './index.js')
     cp.exec(`node ${ip}`, { env: process.env }, (err, stdout) => {
@@ -61,6 +66,8 @@ describe('create', () => {
           return 'github-pages'
         case 'token':
           return process.env.GITHUB_TOKEN
+        default:
+          return process.env[`INPUT_${param.toUpperCase()}`] || ''
       }
     })
 
@@ -120,6 +127,52 @@ describe('create', () => {
     scope.done()
   })
 
+  it.only('can successfully create a preview deployment', async () => {
+    process.env.GITHUB_SHA = 'valid-build-version'
+    const fakeJwt =
+      'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.1wyupfxu1HGoTyIqatYg0hIxy2-0bMO-yVlmLSMuu2w'
+    const scope = nock(`http://my-url`)
+      .get('/_apis/pipelines/workflows/123/artifacts?api-version=6.0-preview')
+      .reply(200, {
+        value: [
+          { url: 'https://another-artifact.com', name: 'another-artifact' },
+          { url: 'https://fake-artifact.com', name: 'github-pages' }
+        ]
+      })
+
+    core.getIDToken = jest.fn().mockResolvedValue(fakeJwt)
+    axios.post = jest.fn().mockResolvedValue('test')
+
+    // Return `"true"` for `core.getInput("preview")`
+    process.env.INPUT_PREVIEW = 'true'
+
+    // Create the deployment
+    const deployment = new Deployment()
+    await deployment.create(fakeJwt)
+
+    expect(axios.post).toBeCalledWith(
+      'https://api.github.com/repos/paper-spa/is-awesome/pages/deployment',
+      {
+        artifact_url: 'https://fake-artifact.com&%24expand=SignedContent',
+        pages_build_version: 'valid-build-version',
+        oidc_token: fakeJwt,
+        preview: true
+      },
+      {
+        headers: {
+          Accept: 'application/vnd.github.v3+json',
+          Authorization: `Bearer gha-token`,
+          'Content-type': 'application/json'
+        }
+      }
+    )
+
+    expect(core.setFailed).not.toHaveBeenCalled()
+    expect(core.info).toHaveBeenCalledWith('Created deployment for valid-build-version')
+
+    scope.done()
+  })
+
   it('Reports errors with failed deployments', async () => {
     process.env.GITHUB_SHA = 'invalid-build-version'
     const scope = nock(`http://my-url`)