diff --git a/Meta/Lagom/CMakeLists.txt b/Meta/Lagom/CMakeLists.txt
index 45fd9f6b038..3dc71a7e358 100644
--- a/Meta/Lagom/CMakeLists.txt
+++ b/Meta/Lagom/CMakeLists.txt
@@ -627,8 +627,6 @@ if (BUILD_LAGOM)
         lagom_test(../../Tests/LibAudio/TestFLACSpec.cpp LIBS LibAudio WORKING_DIRECTORY "${FLAC_TEST_PATH}/..")
 
         # LibCore
-        lagom_test(../../Tests/LibCore/TestLibCoreIODevice.cpp WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/../../Tests/LibCore)
-
         if ((LINUX OR APPLE) AND NOT EMSCRIPTEN)
             lagom_test(../../Tests/LibCore/TestLibCoreFileWatcher.cpp)
         endif()
diff --git a/Tests/LibCore/CMakeLists.txt b/Tests/LibCore/CMakeLists.txt
index dd5aed29430..a4a568bb900 100644
--- a/Tests/LibCore/CMakeLists.txt
+++ b/Tests/LibCore/CMakeLists.txt
@@ -1,7 +1,6 @@
 set(TEST_SOURCES
     TestLibCoreArgsParser.cpp
     TestLibCoreFileWatcher.cpp
-    TestLibCoreIODevice.cpp
     TestLibCoreDeferredInvoke.cpp
     TestLibCoreStream.cpp
     TestLibCoreFilePermissionsMask.cpp
diff --git a/Tests/LibCore/TestLibCoreIODevice.cpp b/Tests/LibCore/TestLibCoreIODevice.cpp
deleted file mode 100644
index 025d5042db2..00000000000
--- a/Tests/LibCore/TestLibCoreIODevice.cpp
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- * Copyright (c) 2021, the SerenityOS developers.
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-#include <LibCore/DeprecatedFile.h>
-#include <LibTest/TestCase.h>
-#include <unistd.h>
-
-static bool files_have_same_contents(DeprecatedString filename1, DeprecatedString filename2)
-{
-    auto file1 = Core::DeprecatedFile::open(filename1, Core::OpenMode::ReadOnly).value();
-    auto file2 = Core::DeprecatedFile::open(filename2, Core::OpenMode::ReadOnly).value();
-    auto contents1 = file1->read_all(), contents2 = file2->read_all();
-    return contents1 == contents2;
-}
-
-TEST_CASE(file_readline)
-{
-    auto path = "long_lines.txt";
-    auto file_or_error = Core::DeprecatedFile::open(path, Core::OpenMode::ReadOnly);
-    if (file_or_error.is_error()) {
-        warnln("Failed to open {}: {}", path, file_or_error.error());
-        VERIFY_NOT_REACHED();
-    }
-    auto file = file_or_error.release_value();
-    auto output_path = "/tmp/output.txt";
-    auto outfile_or_error = Core::DeprecatedFile::open(output_path, Core::OpenMode::WriteOnly);
-    auto outputfile = outfile_or_error.release_value();
-    while (file->can_read_line()) {
-        outputfile->write(file->read_line());
-        outputfile->write("\n"sv);
-    }
-    file->close();
-    outputfile->close();
-    VERIFY(files_have_same_contents(path, output_path));
-    unlink(output_path);
-}
-
-TEST_CASE(file_get_read_position)
-{
-    const DeprecatedString path = "10kb.txt";
-    auto file = Core::DeprecatedFile::open(path, Core::OpenMode::ReadOnly).release_value();
-
-    const size_t step_size = 98;
-    for (size_t i = 0; i < 10240 - step_size; i += step_size) {
-        auto read_buffer = file->read(step_size);
-        EXPECT_EQ(read_buffer.size(), step_size);
-
-        for (size_t j = 0; j < read_buffer.size(); j++) {
-            EXPECT_EQ(static_cast<u32>(read_buffer[j] - '0'), (i + j) % 10);
-        }
-
-        off_t offset = 0;
-        VERIFY(file->seek(0, SeekMode::FromCurrentPosition, &offset));
-        EXPECT_EQ(offset, static_cast<off_t>(i + step_size));
-    }
-
-    {
-        off_t offset = 0;
-        VERIFY(file->seek(0, SeekMode::FromEndPosition, &offset));
-        EXPECT_EQ(offset, 10240);
-    }
-
-    {
-        off_t offset = 0;
-        VERIFY(file->seek(0, SeekMode::SetPosition, &offset));
-        EXPECT_EQ(offset, 0);
-    }
-}
-
-TEST_CASE(file_lines_range)
-{
-    auto path = "long_lines.txt";
-    auto file_or_error = Core::DeprecatedFile::open(path, Core::OpenMode::ReadOnly);
-    if (file_or_error.is_error()) {
-        warnln("Failed to open {}: {}", path, file_or_error.error());
-        VERIFY_NOT_REACHED();
-    }
-    auto file = file_or_error.release_value();
-    auto output_path = "/tmp/output.txt";
-    auto outfile_or_error = Core::DeprecatedFile::open(output_path, Core::OpenMode::WriteOnly);
-    auto outputfile = outfile_or_error.release_value();
-    for (auto line : file->lines()) {
-        outputfile->write(line);
-        outputfile->write("\n"sv);
-    }
-    file->close();
-    outputfile->close();
-    VERIFY(files_have_same_contents(path, output_path));
-    unlink(output_path);
-}