diff --git a/include/shiguredo/mp4/writer/faststart_writer.hpp b/include/shiguredo/mp4/writer/faststart_writer.hpp
index 6af89e0..4d53a08 100644
--- a/include/shiguredo/mp4/writer/faststart_writer.hpp
+++ b/include/shiguredo/mp4/writer/faststart_writer.hpp
@@ -42,6 +42,8 @@ class FaststartWriter : public Writer {
   void appendTrakAndUdtaBoxInfo(const std::vector<shiguredo::mp4::track::Track*>&) override;
   void writeMdatHeader();
   void copyMdatData();
+  void deleteIntermediateFile();
+  std::filesystem::path getIntermediateFilePath();
 
  private:
   std::ostream& m_os;
diff --git a/src/writer/faststart_writer.cpp b/src/writer/faststart_writer.cpp
index a11a29e..e8807a9 100644
--- a/src/writer/faststart_writer.cpp
+++ b/src/writer/faststart_writer.cpp
@@ -6,6 +6,8 @@
 #include <algorithm>
 #include <chrono>
 #include <cstdint>
+#include <cstdio>
+#include <cstring>
 #include <iterator>
 #include <limits>
 #include <stdexcept>
@@ -141,13 +143,13 @@ std::uint64_t FaststartWriter::getMdatHeaderSize() const {
 }
 
 void FaststartWriter::copyMdatData() {
-  if (auto ret = ::fseek(m_mdat_fd, 0, SEEK_SET); ret == -1) {
+  if (auto ret = std::fseek(m_mdat_fd, 0, SEEK_SET); ret == -1) {
     throw std::runtime_error("fseek failed");
   }
 
   char buffer[COPY_MDAT_DATA_BUFFER_SIZE];
-  while (!::feof(m_mdat_fd)) {
-    std::size_t size = ::fread(buffer, 1, COPY_MDAT_DATA_BUFFER_SIZE, m_mdat_fd);
+  while (!std::feof(m_mdat_fd)) {
+    std::size_t size = std::fread(buffer, 1, COPY_MDAT_DATA_BUFFER_SIZE, m_mdat_fd);
     std::copy_n(buffer, size, std::ostreambuf_iterator<char>(m_os));
     if (!m_os.good()) {
       throw std::runtime_error(
@@ -155,15 +157,12 @@ void FaststartWriter::copyMdatData() {
     }
   }
 
-  if (auto ret = ::fclose(m_mdat_fd); ret == EOF) {
+  if (auto ret = std::fclose(m_mdat_fd); ret == EOF) {
     throw std::runtime_error(
         fmt::format("FaststartWriter::copyMdatData(): cannot close the intermediate file: {}", m_mdat_path.string()));
   }
 
-  if (bool result = std::filesystem::remove(m_mdat_path); !result) {
-    throw std::runtime_error(
-        fmt::format("FaststartWriter::copyMdatData(): cannot remove the intermediate file: {}", m_mdat_path.string()));
-  }
+  deleteIntermediateFile();
 }
 
 void FaststartWriter::appendTrakAndUdtaBoxInfo(const std::vector<shiguredo::mp4::track::Track*>& tracks) {
@@ -193,4 +192,16 @@ void FaststartWriter::appendTrakAndUdtaBoxInfo(const std::vector<shiguredo::mp4:
   } while (prev_size != size);
 }
 
+void FaststartWriter::deleteIntermediateFile() {
+  if (bool result = std::filesystem::remove(m_mdat_path); !result) {
+    throw std::runtime_error(fmt::format(
+        "FaststartWriter::deleteIntermediateFile(): cannot remove the intermediate file: {}", m_mdat_path.string()));
+  }
+}
+
+std::filesystem::path FaststartWriter::getIntermediateFilePath() {
+  return m_mdat_path;
+}
+
 }  // namespace shiguredo::mp4::writer
+
diff --git a/test/integration/Makefile b/test/integration/Makefile
index b785ed6..197d3e7 100644
--- a/test/integration/Makefile
+++ b/test/integration/Makefile
@@ -7,7 +7,7 @@ get_input_files:
 	[ -f input/sample-5s.mp4  ] || curl -o input/sample-5s.mp4 https://samplelib.com/lib/download/mp4/sample-5s.mp4 # "Below are sample videos available for download with no license restrictions." -- https://samplelib.com/sample-mp4.html
 	sha224sum -c input/check
 
-test: get_input_files mux_test dump_test
+test: mux_test dump_test
 	sha224sum -c output/check
 
 mux_test:
@@ -18,7 +18,7 @@ mux_test:
 	faketime -f '2020-12-01 00:00:00' ../../release/mp4-muxer aacvp9 -f output/aacvp9_test.mp4 --aac resources/aac.csv --vp9 resources/vp9.csv
 	faketime -f '2020-12-01 00:00:00' ../../release/mp4-muxer aacvp9_faststart -f output/aacvp9_faststart_test.mp4 --aac resources/aac.csv --vp9 resources/vp9.csv
 
-dump_test:
+dump_test: get_input_files
 	for f in input/*.mp4; do \
 		base=$$(basename $${f}); \
 		../../release/mp4-tool dump -f $${f} > output/$${base}.dump; \