diff --git a/test/expired.in.js b/test/expired.in.js
index f267d18..44b2f1f 100644
--- a/test/expired.in.js
+++ b/test/expired.in.js
@@ -11,7 +11,7 @@ test('expired.in returns positive ms for valid cache', t => {
 	const date = new Date().toUTCString();
 	const maxAge = 300;
 	const headers = {
-		date: date,
+		date,
 		age: 0,
 		'cache-control': `public, max-age=${maxAge}`
 	};
@@ -25,7 +25,7 @@ test('expired.in returns positive ms for valid cache', t => {
 test('expired.in returns zero ms for instantly stale cache', t => {
 	const date = new Date().toUTCString();
 	const headers = {
-		date: date,
+		date,
 		age: 0,
 		'cache-control': `public, max-age=0`
 	};
diff --git a/test/expired.on.js b/test/expired.on.js
index 4df869d..b412898 100644
--- a/test/expired.on.js
+++ b/test/expired.on.js
@@ -11,7 +11,7 @@ test('expired.on returns correct expirey date for valid cache', t => {
 	const date = new Date().toUTCString();
 	const maxAge = 300;
 	const headers = {
-		date: date,
+		date,
 		age: 0,
 		'cache-control': `public, max-age=${maxAge}`
 	};
@@ -23,7 +23,7 @@ test('expired.on returns correct expirey date for valid cache', t => {
 test('expired.on returns correct expirey date for instantly stale cache', t => {
 	const date = new Date().toUTCString();
 	const headers = {
-		date: date,
+		date,
 		age: 0,
 		'cache-control': `public, max-age=0`
 	};
@@ -50,8 +50,8 @@ test('expired.on takes age into account', t => {
 	const age = 150;
 	const maxAge = 300;
 	const headers = {
-		date: date,
-		age: age,
+		date,
+		age,
 		'cache-control': `public, max-age=${maxAge}`
 	};
 	const expiredOn = addSeconds(date, (maxAge - age));
@@ -74,8 +74,8 @@ test('expired.on prefers Cache-Control over Expires header', t => {
 	const age = 150;
 	const maxAge = 300;
 	const headers = {
-		date: date,
-		age: age,
+		date,
+		age,
 		'cache-control': `public, max-age=${maxAge}`,
 		expires: date
 	};
diff --git a/test/headers.js b/test/headers.js
index 5cd04c1..6296430 100644
--- a/test/headers.js
+++ b/test/headers.js
@@ -18,7 +18,7 @@ test('throw error if Date header is missing', t => {
 test('headers can be passed in as an object', t => {
 	const date = new Date().toUTCString();
 	const headers = {
-		date: date,
+		date,
 		age: 0,
 		'cache-control': `public, max-age=0`
 	};