diff --git a/package.json b/package.json
index 445033e..194f7e5 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "build": "yarn workspace @mdx-deck/docs build",
     "start-theme": "yarn workspace @mdx-deck/gatsby-theme start",
     "build-theme": "yarn workspace @mdx-deck/gatsby-theme build",
-    "test": "jest && yarn build-theme"
+    "test": "jest"
   },
   "devDependencies": {
     "@babel/core": "^7.3.4",
diff --git a/packages/components/package.json b/packages/components/package.json
index 4a612a9..0c73576 100644
--- a/packages/components/package.json
+++ b/packages/components/package.json
@@ -21,6 +21,7 @@
   "devDependencies": {
     "react": "^16.8.3",
     "react-dom": "^16.8.3",
-    "react-test-renderer": "^16.8.4"
+    "react-test-renderer": "^16.8.4",
+    "react-testing-library": "^6.1.2"
   }
 }
diff --git a/packages/components/src/__tests__/MDXDeck.js b/packages/components/src/__tests__/MDXDeck.js
new file mode 100644
index 0000000..7546567
--- /dev/null
+++ b/packages/components/src/__tests__/MDXDeck.js
@@ -0,0 +1,35 @@
+import React, { useContext } from 'react'
+import { render, cleanup } from 'react-testing-library'
+import renderer from 'react-test-renderer'
+import { MDXDeckState, MDXDeckContext, MDXDeck } from '../MDXDeck'
+
+afterEach(cleanup)
+
+const slides = [() => <pre>one</pre>, () => <pre>two</pre>]
+
+describe('MDXDeckState', () => {
+  test('provides state', () => {
+    let context
+    const Consumer = props => {
+      context = useContext(MDXDeckContext)
+      return false
+    }
+    const deck = renderer.create(
+      <MDXDeckState>
+        <Consumer />
+      </MDXDeckState>
+    )
+    expect(typeof context.state).toBe('object')
+    expect(typeof context.state.metadata).toBe('object')
+    expect(context.state.step).toBe(0)
+    expect(context.state.mode).toBe('normal')
+    expect(typeof context.setState).toBe('function')
+  })
+
+  test.todo('setState updates state')
+})
+
+test('renders', () => {
+  const json = renderer.create(<MDXDeck slides={slides} />).toJSON()
+  expect(json).toMatchSnapshot()
+})
diff --git a/packages/components/src/__tests__/__snapshots__/MDXDeck.js.snap b/packages/components/src/__tests__/__snapshots__/MDXDeck.js.snap
new file mode 100644
index 0000000..c6516c3
--- /dev/null
+++ b/packages/components/src/__tests__/__snapshots__/MDXDeck.js.snap
@@ -0,0 +1,33 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`renders 1`] = `
+<div>
+  <div
+    role="group"
+    style={
+      Object {
+        "outline": "none",
+      }
+    }
+    tabIndex="-1"
+  >
+    <div
+      className="css-suf238-Root ekm8v3h0"
+    >
+      <div
+        role="group"
+        style={
+          Object {
+            "outline": "none",
+          }
+        }
+        tabIndex="-1"
+      >
+        <pre>
+          one
+        </pre>
+      </div>
+    </div>
+  </div>
+</div>
+`;
diff --git a/yarn.lock b/yarn.lock
index 535f061..cea645b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -747,7 +747,7 @@
   dependencies:
     regenerator-runtime "^0.12.0"
 
-"@babel/runtime@^7.0.0", "@babel/runtime@^7.1.2", "@babel/runtime@^7.3.1", "@babel/runtime@^7.4.2":
+"@babel/runtime@^7.0.0", "@babel/runtime@^7.1.2", "@babel/runtime@^7.3.1", "@babel/runtime@^7.3.4", "@babel/runtime@^7.4.2":
   version "7.4.3"
   resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.4.3.tgz#79888e452034223ad9609187a0ad1fe0d2ad4bdc"
   integrity sha512-9lsJwJLxDh/T3Q3SZszfWOTkk3pHbkmH+3KY+zwIDmsNlxsumuhS2TH3NIpktU4kNvfzy+k3eLT7aTJSPTo0OA==
@@ -1823,6 +1823,11 @@
   dependencies:
     any-observable "^0.3.0"
 
+"@sheerun/mutationobserver-shim@^0.3.2":
+  version "0.3.2"
+  resolved "https://registry.yarnpkg.com/@sheerun/mutationobserver-shim/-/mutationobserver-shim-0.3.2.tgz#8013f2af54a2b7d735f71560ff360d3a8176a87b"
+  integrity sha512-vTCdPp/T/Q3oSqwHmZ5Kpa9oI7iLtGl3RQaA/NyLHikvcrPxACkkKVr/XzkSPJWXHRhKGzVvb0urJsbMlRxi1Q==
+
 "@stefanprobst/lokijs@^1.5.6-b":
   version "1.5.6-b"
   resolved "https://registry.yarnpkg.com/@stefanprobst/lokijs/-/lokijs-1.5.6-b.tgz#6a36a86dbe132e702e6b15ffd3ce4139aebfe942"
@@ -5002,6 +5007,16 @@ dom-serializer@0, dom-serializer@~0.1.0:
     domelementtype "^1.3.0"
     entities "^1.1.1"
 
+dom-testing-library@^3.19.0:
+  version "3.19.3"
+  resolved "https://registry.yarnpkg.com/dom-testing-library/-/dom-testing-library-3.19.3.tgz#fba399987be1bdd57b07c4bc3ef46c3c084b26d9"
+  integrity sha512-oiI+oq91iO/Vpp+pt8PqfqLfBK074FH0eprhoFNvBCvJOk7vL4ozbe/yj/kEEGR6kiT4F3MAam19AX1fdGFjrA==
+  dependencies:
+    "@babel/runtime" "^7.3.4"
+    "@sheerun/mutationobserver-shim" "^0.3.2"
+    pretty-format "^24.5.0"
+    wait-for-expect "^1.1.0"
+
 dom-walk@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/dom-walk/-/dom-walk-0.1.1.tgz#672226dc74c8f799ad35307df936aba11acd6018"
@@ -11470,7 +11485,7 @@ pretty-error@^2.1.1:
     renderkid "^2.0.1"
     utila "~0.4"
 
-pretty-format@^24.7.0:
+pretty-format@^24.5.0, pretty-format@^24.7.0:
   version "24.7.0"
   resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-24.7.0.tgz#d23106bc2edcd776079c2daa5da02bcb12ed0c10"
   integrity sha512-apen5cjf/U4dj7tHetpC7UEFCvtAgnNZnBDkfPv3fokzIqyOJckAG9OlAPC1BlFALnqT/lGB2tl9EJjlK6eCsA==
@@ -11901,6 +11916,14 @@ react-test-renderer@^16.8.4:
     react-is "^16.8.6"
     scheduler "^0.13.6"
 
+react-testing-library@^6.1.2:
+  version "6.1.2"
+  resolved "https://registry.yarnpkg.com/react-testing-library/-/react-testing-library-6.1.2.tgz#f6bba6eeecedac736eb00b22b4c70bae04535a4f"
+  integrity sha512-z69lhRDGe7u/NOjDCeFRoe1cB5ckJ4656n0tj/Fdcr6OoBUu7q9DBw0ftR7v5i3GRpdSWelnvl+feZFOyXyxwg==
+  dependencies:
+    "@babel/runtime" "^7.4.2"
+    dom-testing-library "^3.19.0"
+
 react@^16.8.3, react@^16.8.6:
   version "16.8.6"
   resolved "https://registry.yarnpkg.com/react/-/react-16.8.6.tgz#ad6c3a9614fd3a4e9ef51117f54d888da01f2bbe"
@@ -14432,6 +14455,11 @@ w3c-hr-time@^1.0.1:
   dependencies:
     browser-process-hrtime "^0.1.2"
 
+wait-for-expect@^1.1.0:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/wait-for-expect/-/wait-for-expect-1.1.1.tgz#9cd10e07d52810af9e0aaf509872e38f3c3d81ae"
+  integrity sha512-vd9JOqqEcBbCDhARWhW85ecjaEcfBLuXgVBqatfS3iw6oU4kzAcs+sCNjF+TC9YHPImCW7ypsuQc+htscIAQCw==
+
 walker@^1.0.7, walker@~1.0.5:
   version "1.0.7"
   resolved "https://registry.yarnpkg.com/walker/-/walker-1.0.7.tgz#2f7f9b8fd10d677262b18a884e28d19618e028fb"