diff --git a/libc/test/src/stdio/fileop_test.cpp b/libc/test/src/stdio/fileop_test.cpp
@@ -0,0 +1,43 @@
+//===-- Unittests for file operations like fopen, flcose etc --------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/stdio/fclose.h"
+#include "src/stdio/fopen.h"
+#include "src/stdio/fread.h"
+#include "src/stdio/fseek.h"
+#include "src/stdio/fwrite.h"
+#include "utils/UnitTest/Test.h"
+
+#include <stdio.h>
+
+TEST(LlvmLibcStdio, SimpleOperations) {
+  constexpr char FILENAME[] = "testdata/simple_operations.test";
+  ::FILE *file = __llvm_libc::fopen(FILENAME, "w");
+  ASSERT_FALSE(file == nullptr);
+  constexpr char CONTENT[] = "1234567890987654321";
+  ASSERT_EQ(sizeof(CONTENT) - 1,
+            __llvm_libc::fwrite(CONTENT, 1, sizeof(CONTENT) - 1, file));
+  ASSERT_EQ(0, __llvm_libc::fclose(file));
+
+  file = __llvm_libc::fopen(FILENAME, "r");
+  ASSERT_FALSE(file == nullptr);
+
+  constexpr size_t READ_SIZE = 5;
+  char data[READ_SIZE];
+  data[READ_SIZE - 1] = '\0';
+  ASSERT_EQ(__llvm_libc::fread(data, 1, READ_SIZE - 1, file), READ_SIZE - 1);
+  ASSERT_STREQ(data, "1234");
+  ASSERT_EQ(__llvm_libc::fseek(file, 5, SEEK_CUR), 0);
+  ASSERT_EQ(__llvm_libc::fread(data, 1, READ_SIZE - 1, file), READ_SIZE - 1);
+  ASSERT_STREQ(data, "0987");
+  ASSERT_EQ(__llvm_libc::fseek(file, -5, SEEK_CUR), 0);
+  ASSERT_EQ(__llvm_libc::fread(data, 1, READ_SIZE - 1, file), READ_SIZE - 1);
+  ASSERT_STREQ(data, "9098");
+
+  ASSERT_EQ(__llvm_libc::fclose(file), 0);
+}
diff --git a/libc/test/src/stdio/fwrite_test.cpp b/libc/test/src/stdio/fwrite_test.cpp
diff --git a/libc/test/src/stdio/testdata/CMakeLists.txt b/libc/test/src/stdio/testdata/CMakeLists.txt