diff --git a/test/addons-napi/test_reference/test.js b/test/addons-napi/test_reference/test.js
index aaf5531f39e1f3..14932a74ca70b0 100644
--- a/test/addons-napi/test_reference/test.js
+++ b/test/addons-napi/test_reference/test.js
@@ -22,7 +22,7 @@ function runTests(i, title, tests) {
       try {
         tests[i]();
       } catch (e) {
-        console.error('Test failed: ' + title);
+        console.error(`Test failed: ${title}`);
         throw e;
       }
       setImmediate(() => {
diff --git a/test/async-hooks/test-signalwrap.js b/test/async-hooks/test-signalwrap.js
index c2e664af9a567e..ff7d08bc1207b0 100644
--- a/test/async-hooks/test-signalwrap.js
+++ b/test/async-hooks/test-signalwrap.js
@@ -22,7 +22,7 @@ assert.strictEqual(typeof signal1.triggerAsyncId, 'number');
 checkInvocations(signal1, { init: 1 }, 'when SIGUSR2 handler is set up');
 
 let count = 0;
-exec('kill -USR2 ' + process.pid);
+exec(`kill -USR2 ${process.pid}`);
 
 let signal2;
 
@@ -36,7 +36,7 @@ function onsigusr2() {
       ' signal1: when first SIGUSR2 handler is called for the first time');
 
     // trigger same signal handler again
-    exec('kill -USR2 ' + process.pid);
+    exec(`kill -USR2 ${process.pid}`);
   } else {
     // second invocation
     checkInvocations(
@@ -61,7 +61,7 @@ function onsigusr2() {
       signal2, { init: 1 },
       'signal2: when second SIGUSR2 handler is setup');
 
-    exec('kill -USR2 ' + process.pid);
+    exec(`kill -USR2 ${process.pid}`);
   }
 }