diff --git a/Tests/Kernel/TestKernelPledge.cpp b/Tests/Kernel/TestKernelPledge.cpp
index 02f9ce6f9c..3a90450c2e 100644
--- a/Tests/Kernel/TestKernelPledge.cpp
+++ b/Tests/Kernel/TestKernelPledge.cpp
@@ -4,7 +4,9 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/String.h>
 #include <LibTest/TestCase.h>
+#include <errno.h>
 #include <unistd.h>
 
 TEST_CASE(test_nonexistent_pledge)
@@ -14,6 +16,31 @@ TEST_CASE(test_nonexistent_pledge)
         FAIL("Pledging on existent promises should fail.");
 }
 
+TEST_CASE(test_pledge_argument_validation)
+{
+    const auto long_argument = String::repeated('a', 2048);
+
+    auto res = pledge(long_argument.characters(), "stdio");
+    EXPECT_EQ(res, -1);
+    EXPECT_EQ(errno, E2BIG);
+
+    res = pledge("stdio", long_argument.characters());
+    EXPECT_EQ(res, -1);
+    EXPECT_EQ(errno, E2BIG);
+
+    res = pledge(long_argument.characters(), long_argument.characters());
+    EXPECT_EQ(res, -1);
+    EXPECT_EQ(errno, E2BIG);
+
+    res = pledge("fake", "stdio");
+    EXPECT_EQ(res, -1);
+    EXPECT_EQ(errno, EINVAL);
+
+    res = pledge("stdio", "fake");
+    EXPECT_EQ(res, -1);
+    EXPECT_EQ(errno, EINVAL);
+}
+
 TEST_CASE(test_pledge_failures)
 {
     auto res = pledge("stdio unix rpath", "stdio");