diff --git a/Tests/Kernel/TestProcFS.cpp b/Tests/Kernel/TestProcFS.cpp
new file mode 100644
index 0000000000..105a8c8c75
--- /dev/null
+++ b/Tests/Kernel/TestProcFS.cpp
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibTest/TestCase.h>
+#include <cstring>
+#include <unistd.h>
+
+TEST_CASE(test_process_fd_readlink)
+{
+    char expected_link[MAXPATHLEN];
+    char buf[MAXPATHLEN];
+
+    // Read the symlink value for stdin, stdout and stderr
+    auto link_length = readlink("/proc/self/fd/0", expected_link, sizeof(expected_link));
+    expected_link[link_length] = '\0';
+
+    link_length = readlink("/proc/self/fd/1", buf, sizeof(buf));
+    buf[link_length] = '\0';
+    EXPECT_EQ(0, strcmp(buf, expected_link));
+
+    link_length = readlink("/proc/self/fd/2", buf, sizeof(buf));
+    buf[link_length] = '\0';
+    EXPECT_EQ(0, strcmp(buf, expected_link));
+
+    // Create a new file descriptor that is a dup of 0 with various big values in order to reproduce issue #7820.
+    // We should get the same link value for each fd that was duplicated.
+
+    // 255 is the first broken file descriptor that was discovered and might be used by other software (e.g. bash)
+    auto new_fd = dup2(0, 255);
+    EXPECT_EQ(new_fd, 255);
+    link_length = readlink("/proc/self/fd/255", buf, sizeof(buf));
+    buf[link_length] = '\0';
+    EXPECT_EQ(0, strcmp(buf, expected_link));
+
+    // 215 is the last fd before we have to encode the fd using more than one byte (due to the offset by FI_MaxStaticFileIndex)
+    new_fd = dup2(0, 215);
+    EXPECT_EQ(new_fd, 215);
+    link_length = readlink("/proc/self/fd/215", buf, sizeof(buf));
+    buf[link_length] = '\0';
+    EXPECT_EQ(0, strcmp(buf, expected_link));
+
+    // 216 is the first fd that is encoded using more than one byte
+    new_fd = dup2(0, 216);
+    EXPECT_EQ(new_fd, 216);
+    link_length = readlink("/proc/self/fd/216", buf, sizeof(buf));
+    buf[link_length] = '\0';
+    EXPECT_EQ(0, strcmp(buf, expected_link));
+
+    // 1023 is the largest possible file descriptor
+    new_fd = dup2(0, 1023);
+    EXPECT_EQ(new_fd, 1023);
+    link_length = readlink("/proc/self/fd/1023", buf, sizeof(buf));
+    buf[link_length] = '\0';
+    EXPECT_EQ(0, strcmp(buf, expected_link));
+}