1 files changed, 8 insertions, 0 deletions
diff --git a/cli/tests/unit/buffer_test.ts b/cli/tests/unit/buffer_test.ts
index a5a0147ab..23e655a05 100644
--- a/cli/tests/unit/buffer_test.ts
+++ b/cli/tests/unit/buffer_test.ts
@@ -7,6 +7,8 @@ import {
   assertEquals,
   assert,
   assertStringContains,
+  assertThrows,
+  assertThrowsAsync,
   unitTest,
 } from "./test_util.ts";
 
@@ -202,6 +204,9 @@ unitTest(async function bufferReadFrom(): Promise<void> {
     const fub = new Uint8Array(testString.length);
     await empty(b, s, fub);
   }
+  assertThrowsAsync(async function () {
+    await new Buffer().readFrom(null!);
+  });
 });
 
 unitTest(async function bufferReadFromSync(): Promise<void> {
@@ -221,6 +226,9 @@ unitTest(async function bufferReadFromSync(): Promise<void> {
     const fub = new Uint8Array(testString.length);
     await empty(b, s, fub);
   }
+  assertThrows(function () {
+    new Buffer().readFromSync(null!);
+  });
 });
 
 unitTest(async function bufferTestGrow(): Promise<void> {