diff --git a/benchmark/assert/deepequal-buffer.js b/benchmark/assert/deepequal-buffer.js
index 9e86aa231e..d4495af69b 100644
--- a/benchmark/assert/deepequal-buffer.js
+++ b/benchmark/assert/deepequal-buffer.js
@@ -27,6 +27,8 @@ function main(conf) {
   data.copy(expectedWrong);
 
   switch (conf.method) {
+    case '':
+      // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual':
       bench.start();
       for (i = 0; i < n; ++i) {
diff --git a/benchmark/assert/deepequal-map.js b/benchmark/assert/deepequal-map.js
index eae4a20605..4976f26198 100644
--- a/benchmark/assert/deepequal-map.js
+++ b/benchmark/assert/deepequal-map.js
@@ -46,6 +46,8 @@ function main(conf) {
   var values, values2;
 
   switch (conf.method) {
+    case '':
+      // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual_primitiveOnly':
       values = array.map((_, i) => [`str_${i}`, 123]);
       benchmark(assert.deepEqual, n, values);
diff --git a/benchmark/assert/deepequal-object.js b/benchmark/assert/deepequal-object.js
index d1a6cb6994..2efa9452af 100644
--- a/benchmark/assert/deepequal-object.js
+++ b/benchmark/assert/deepequal-object.js
@@ -37,6 +37,8 @@ function main(conf) {
   const expectedWrong = createObj(source, '4');
 
   switch (conf.method) {
+    case '':
+      // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual':
       bench.start();
       for (i = 0; i < n; ++i) {
diff --git a/benchmark/assert/deepequal-prims-and-objs-big-array-set.js b/benchmark/assert/deepequal-prims-and-objs-big-array-set.js
index 1e356cea51..19337d7828 100644
--- a/benchmark/assert/deepequal-prims-and-objs-big-array-set.js
+++ b/benchmark/assert/deepequal-prims-and-objs-big-array-set.js
@@ -53,6 +53,8 @@ function main(conf) {
   const expectedWrongSet = new Set(expectedWrong);
 
   switch (conf.method) {
+    case '':
+      // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual_Array':
       bench.start();
       for (i = 0; i < n; ++i) {
diff --git a/benchmark/assert/deepequal-prims-and-objs-big-loop.js b/benchmark/assert/deepequal-prims-and-objs-big-loop.js
index 2800b51c49..4a345f27c2 100644
--- a/benchmark/assert/deepequal-prims-and-objs-big-loop.js
+++ b/benchmark/assert/deepequal-prims-and-objs-big-loop.js
@@ -34,6 +34,8 @@ function main(conf) {
 
   // Creates new array to avoid loop invariant code motion
   switch (conf.method) {
+    case '':
+      // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual':
       bench.start();
       for (i = 0; i < n; ++i) {
diff --git a/benchmark/assert/deepequal-set.js b/benchmark/assert/deepequal-set.js
index ecf44c063d..aa0ebc0648 100644
--- a/benchmark/assert/deepequal-set.js
+++ b/benchmark/assert/deepequal-set.js
@@ -47,6 +47,8 @@ function main(conf) {
   var values, values2;
 
   switch (conf.method) {
+    case '':
+      // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual_primitiveOnly':
       values = array.map((_, i) => `str_${i}`);
       benchmark(assert.deepEqual, n, values);
diff --git a/benchmark/assert/deepequal-typedarrays.js b/benchmark/assert/deepequal-typedarrays.js
index 6794ced081..8e8cc4b083 100644
--- a/benchmark/assert/deepequal-typedarrays.js
+++ b/benchmark/assert/deepequal-typedarrays.js
@@ -38,6 +38,8 @@ function main(conf) {
   var i;
 
   switch (conf.method) {
+    case '':
+      // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual':
       bench.start();
       for (i = 0; i < n; ++i) {
diff --git a/benchmark/assert/throws.js b/benchmark/assert/throws.js
index 9043799256..075e227f88 100644
--- a/benchmark/assert/throws.js
+++ b/benchmark/assert/throws.js
@@ -22,6 +22,8 @@ function main(conf) {
   var i;
 
   switch (conf.method) {
+    case '':
+      // Empty string falls through to next line as default, mostly for tests.
     case 'doesNotThrow':
       bench.start();
       for (i = 0; i < n; ++i) {