diff --git a/services/document-updater/test/acceptance/js/PeekingADoc.js b/services/document-updater/test/acceptance/js/PeekingADoc.js
new file mode 100644
index 0000000000..43e463ca51
--- /dev/null
+++ b/services/document-updater/test/acceptance/js/PeekingADoc.js
@@ -0,0 +1,99 @@
+const sinon = require('sinon')
+const MockWebApi = require('./helpers/MockWebApi')
+const DocUpdaterClient = require('./helpers/DocUpdaterClient')
+const DocUpdaterApp = require('./helpers/DocUpdaterApp')
+
+describe('Peeking a document', function () {
+  before(function (done) {
+    this.lines = ['one', 'two', 'three']
+    this.version = 42
+    return DocUpdaterApp.ensureRunning(done)
+  })
+
+  describe('when the document is not loaded', function () {
+    before(function (done) {
+      this.project_id = DocUpdaterClient.randomId()
+      this.doc_id = DocUpdaterClient.randomId()
+      sinon.spy(MockWebApi, 'getDocument')
+
+      MockWebApi.insertDoc(this.project_id, this.doc_id, {
+        lines: this.lines,
+        version: this.version,
+      })
+
+      return DocUpdaterClient.peekDoc(
+        this.project_id,
+        this.doc_id,
+        (error, res, returnedDoc) => {
+          this.error = error
+          this.res = res
+          this.returnedDoc = returnedDoc
+          return done()
+        }
+      )
+    })
+
+    after(function () {
+      return MockWebApi.getDocument.restore()
+    })
+
+    it('should return a 404 response', function () {
+      this.res.statusCode.should.equal(404)
+    })
+
+    it('should not load the document from the web API', function () {
+      return MockWebApi.getDocument.called.should.equal(false)
+    })
+  })
+
+  describe('when the document is already loaded', function () {
+    before(function (done) {
+      this.project_id = DocUpdaterClient.randomId()
+      this.doc_id = DocUpdaterClient.randomId()
+
+      MockWebApi.insertDoc(this.project_id, this.doc_id, {
+        lines: this.lines,
+        version: this.version,
+      })
+      return DocUpdaterClient.preloadDoc(
+        this.project_id,
+        this.doc_id,
+        error => {
+          if (error != null) {
+            throw error
+          }
+          sinon.spy(MockWebApi, 'getDocument')
+          return DocUpdaterClient.getDoc(
+            this.project_id,
+            this.doc_id,
+            (error, res, returnedDoc) => {
+              this.res = res
+              this.returnedDoc = returnedDoc
+              return done()
+            }
+          )
+        }
+      )
+    })
+
+    after(function () {
+      return MockWebApi.getDocument.restore()
+    })
+
+    it('should return a 200 response', function () {
+      this.res.statusCode.should.equal(200)
+    })
+
+    it('should return the document lines', function () {
+      return this.returnedDoc.lines.should.deep.equal(this.lines)
+    })
+
+    it('should return the document version', function () {
+      return this.returnedDoc.version.should.equal(this.version)
+    })
+
+    it('should not load the document from the web API', function () {
+      return MockWebApi.getDocument.called.should.equal(false)
+    })
+  })
+})
diff --git a/services/document-updater/test/acceptance/js/helpers/DocUpdaterClient.js b/services/document-updater/test/acceptance/js/helpers/DocUpdaterClient.js
index 71e7915c0f..9a3234628c 100644
--- a/services/document-updater/test/acceptance/js/helpers/DocUpdaterClient.js
+++ b/services/document-updater/test/acceptance/js/helpers/DocUpdaterClient.js
@@ -123,6 +123,18 @@ module.exports = DocUpdaterClient = {
     DocUpdaterClient.getDoc(projectId, docId, callback)
   },
 
+  peekDoc(projectId, docId, callback) {
+    request.get(
+      `http://localhost:3003/project/${projectId}/doc/${docId}/peek`,
+      (error, res, body) => {
+        if (body != null && res.statusCode >= 200 && res.statusCode < 300) {
+          body = JSON.parse(body)
+        }
+        callback(error, res, body)
+      }
+    )
+  },
+
   flushDoc(projectId, docId, callback) {
     request.post(
       `http://localhost:3003/project/${projectId}/doc/${docId}/flush`,