diff --git a/src/components/PageTemplate.test.js b/src/components/PageTemplate.test.js
index 8b272de..abdb7b7 100644
--- a/src/components/PageTemplate.test.js
+++ b/src/components/PageTemplate.test.js
@@ -3,6 +3,19 @@ import renderer from 'react-test-renderer';
 
 import PageTemplate from './PageTemplate';
 
+const env = { ...process.env };
+
+afterEach(() => {
+  process.env = env;
+});
+
+beforeEach(() => {
+  process.env = {
+    ...process.env,
+    BANNER: 'testing'
+  };
+});
+
 test('PageTemplate rendering', () => {
   const component = renderer.create(
     <PageTemplate>
diff --git a/src/components/__snapshots__/PageTemplate.test.js.snap b/src/components/__snapshots__/PageTemplate.test.js.snap
index af2faba..6162fc8 100644
--- a/src/components/__snapshots__/PageTemplate.test.js.snap
+++ b/src/components/__snapshots__/PageTemplate.test.js.snap
@@ -24,7 +24,7 @@ exports[`PageTemplate rendering 1`] = `
   </head>
   <body>
     <header
-      data-banner={undefined}
+      data-banner="testing"
       id="main"
     >
       <h1>
@@ -103,7 +103,7 @@ exports[`PageTemplate rendering with title 1`] = `
   </head>
   <body>
     <header
-      data-banner={undefined}
+      data-banner="testing"
       id="main"
     >
       <h1>
