diff --git a/common/hash_calculator_unittest.cc b/common/hash_calculator_unittest.cc
index 233237b..79f22ad 100644
--- a/common/hash_calculator_unittest.cc
+++ b/common/hash_calculator_unittest.cc
@@ -26,6 +26,7 @@
 #include <brillo/secure_blob.h>
 #include <gtest/gtest.h>
 
+#include "update_engine/common/test_utils.h"
 #include "update_engine/common/utils.h"
 
 using std::string;
@@ -43,10 +44,7 @@
   0xc8, 0x8b, 0x59, 0xb2, 0xdc, 0x32, 0x7a, 0xa4
 };
 
-class HashCalculatorTest : public ::testing::Test {
- public:
-  HashCalculatorTest() {}
-};
+class HashCalculatorTest : public ::testing::Test {};
 
 TEST_F(HashCalculatorTest, SimpleTest) {
   HashCalculator calc;
@@ -54,7 +52,7 @@
   calc.Finalize();
   brillo::Blob raw_hash(std::begin(kExpectedRawHash),
                         std::end(kExpectedRawHash));
-  EXPECT_TRUE(raw_hash == calc.raw_hash());
+  EXPECT_EQ(raw_hash, calc.raw_hash());
 }
 
 TEST_F(HashCalculatorTest, MultiUpdateTest) {
@@ -64,7 +62,7 @@
   calc.Finalize();
   brillo::Blob raw_hash(std::begin(kExpectedRawHash),
                         std::end(kExpectedRawHash));
-  EXPECT_TRUE(raw_hash == calc.raw_hash());
+  EXPECT_EQ(raw_hash, calc.raw_hash());
 }
 
 TEST_F(HashCalculatorTest, ContextTest) {
@@ -78,7 +76,7 @@
   calc_next.Finalize();
   brillo::Blob raw_hash(std::begin(kExpectedRawHash),
                         std::end(kExpectedRawHash));
-  EXPECT_TRUE(raw_hash == calc_next.raw_hash());
+  EXPECT_EQ(raw_hash, calc_next.raw_hash());
 }
 
 TEST_F(HashCalculatorTest, BigTest) {
@@ -108,25 +106,21 @@
 }
 
 TEST_F(HashCalculatorTest, UpdateFileSimpleTest) {
-  string data_path;
-  ASSERT_TRUE(
-      utils::MakeTempFile("data.XXXXXX", &data_path, nullptr));
-  ScopedPathUnlinker data_path_unlinker(data_path);
-  ASSERT_TRUE(utils::WriteFile(data_path.c_str(), "hi", 2));
+  test_utils::ScopedTempFile data_file("data.XXXXXX");
+  ASSERT_TRUE(test_utils::WriteFileString(data_file.path(), "hi"));
 
-  static const int kLengths[] = { -1, 2, 10 };
-  for (size_t i = 0; i < arraysize(kLengths); i++) {
+  for (const int length : {-1, 2, 10}) {
     HashCalculator calc;
-    EXPECT_EQ(2, calc.UpdateFile(data_path, kLengths[i]));
+    EXPECT_EQ(2, calc.UpdateFile(data_file.path(), length));
     EXPECT_TRUE(calc.Finalize());
     brillo::Blob raw_hash(std::begin(kExpectedRawHash),
                           std::end(kExpectedRawHash));
-    EXPECT_TRUE(raw_hash == calc.raw_hash());
+    EXPECT_EQ(raw_hash, calc.raw_hash());
   }
 
   HashCalculator calc;
-  EXPECT_EQ(0, calc.UpdateFile(data_path, 0));
-  EXPECT_EQ(1, calc.UpdateFile(data_path, 1));
+  EXPECT_EQ(0, calc.UpdateFile(data_file.path(), 0));
+  EXPECT_EQ(1, calc.UpdateFile(data_file.path(), 1));
   EXPECT_TRUE(calc.Finalize());
   // echo -n h | openssl dgst -sha256 -binary | openssl base64
   EXPECT_EQ("qqlAJmTxpB9A67xSyZk+tmrrNmYClY/fqig7ceZNsSM=",
@@ -134,21 +128,16 @@
 }
 
 TEST_F(HashCalculatorTest, RawHashOfFileSimpleTest) {
-  string data_path;
-  ASSERT_TRUE(
-      utils::MakeTempFile("data.XXXXXX", &data_path, nullptr));
-  ScopedPathUnlinker data_path_unlinker(data_path);
-  ASSERT_TRUE(utils::WriteFile(data_path.c_str(), "hi", 2));
+  test_utils::ScopedTempFile data_file("data.XXXXXX");
+  ASSERT_TRUE(test_utils::WriteFileString(data_file.path(), "hi"));
 
-  static const int kLengths[] = { -1, 2, 10 };
-  for (size_t i = 0; i < arraysize(kLengths); i++) {
+  for (const int length : {-1, 2, 10}) {
     brillo::Blob exp_raw_hash(std::begin(kExpectedRawHash),
                               std::end(kExpectedRawHash));
     brillo::Blob raw_hash;
-    EXPECT_EQ(2, HashCalculator::RawHashOfFile(data_path,
-                                               kLengths[i],
-                                               &raw_hash));
-    EXPECT_TRUE(exp_raw_hash == raw_hash);
+    EXPECT_EQ(
+        2, HashCalculator::RawHashOfFile(data_file.path(), length, &raw_hash));
+    EXPECT_EQ(exp_raw_hash, raw_hash);
   }
 }
 
diff --git a/common/utils_unittest.cc b/common/utils_unittest.cc
index 62f9f6c..dff0569 100644
--- a/common/utils_unittest.cc
+++ b/common/utils_unittest.cc
@@ -57,13 +57,11 @@
 }
 
 TEST(UtilsTest, WriteFileReadFile) {
-  base::FilePath file;
-  EXPECT_TRUE(base::CreateTemporaryFile(&file));
-  ScopedPathUnlinker unlinker(file.value());
-  EXPECT_TRUE(utils::WriteFile(file.value().c_str(), "hello", 5));
+  test_utils::ScopedTempFile file;
+  EXPECT_TRUE(utils::WriteFile(file.path().c_str(), "hello", 5));
 
   brillo::Blob readback;
-  EXPECT_TRUE(utils::ReadFile(file.value().c_str(), &readback));
+  EXPECT_TRUE(utils::ReadFile(file.path().c_str(), &readback));
   EXPECT_EQ("hello", string(readback.begin(), readback.end()));
 }
 
@@ -73,24 +71,21 @@
 }
 
 TEST(UtilsTest, ReadFileChunk) {
-  base::FilePath file;
-  EXPECT_TRUE(base::CreateTemporaryFile(&file));
-  ScopedPathUnlinker unlinker(file.value());
+  test_utils::ScopedTempFile file;
   brillo::Blob data;
   const size_t kSize = 1024 * 1024;
   for (size_t i = 0; i < kSize; i++) {
     data.push_back(i % 255);
   }
-  EXPECT_TRUE(utils::WriteFile(file.value().c_str(), data.data(), data.size()));
+  EXPECT_TRUE(test_utils::WriteFileVector(file.path(), data));
   brillo::Blob in_data;
-  EXPECT_TRUE(utils::ReadFileChunk(file.value().c_str(), kSize, 10, &in_data));
+  EXPECT_TRUE(utils::ReadFileChunk(file.path().c_str(), kSize, 10, &in_data));
   EXPECT_TRUE(in_data.empty());
-  EXPECT_TRUE(utils::ReadFileChunk(file.value().c_str(), 0, -1, &in_data));
-  EXPECT_TRUE(data == in_data);
+  EXPECT_TRUE(utils::ReadFileChunk(file.path().c_str(), 0, -1, &in_data));
+  EXPECT_EQ(data, in_data);
   in_data.clear();
-  EXPECT_TRUE(utils::ReadFileChunk(file.value().c_str(), 10, 20, &in_data));
-  EXPECT_TRUE(brillo::Blob(data.begin() + 10, data.begin() + 10 + 20) ==
-              in_data);
+  EXPECT_TRUE(utils::ReadFileChunk(file.path().c_str(), 10, 20, &in_data));
+  EXPECT_EQ(brillo::Blob(data.begin() + 10, data.begin() + 10 + 20), in_data);
 }
 
 TEST(UtilsTest, ErrnoNumberAsStringTest) {
@@ -464,20 +459,18 @@
 }
 
 TEST(UtilsTest, RunAsRootUnmountFilesystemBusyFailureTest) {
-  string tmp_image;
-  EXPECT_TRUE(utils::MakeTempFile("img.XXXXXX", &tmp_image, nullptr));
-  ScopedPathUnlinker tmp_image_unlinker(tmp_image);
+  test_utils::ScopedTempFile tmp_image("img.XXXXXX");
 
   EXPECT_TRUE(base::CopyFile(
       test_utils::GetBuildArtifactsPath().Append("gen/disk_ext2_4k.img"),
-      base::FilePath(tmp_image)));
+      base::FilePath(tmp_image.path())));
 
   base::ScopedTempDir mnt_dir;
   EXPECT_TRUE(mnt_dir.CreateUniqueTempDir());
 
   string loop_dev;
   test_utils::ScopedLoopbackDeviceBinder loop_binder(
-      tmp_image, true, &loop_dev);
+      tmp_image.path(), true, &loop_dev);
 
   EXPECT_FALSE(utils::IsMountpoint(mnt_dir.GetPath().value()));
   // This is the actual test part. While we hold a file descriptor open for the
@@ -506,10 +499,8 @@
   EXPECT_TRUE(mnt_dir.CreateUniqueTempDir());
   EXPECT_FALSE(utils::IsMountpoint(mnt_dir.GetPath().value()));
 
-  base::FilePath file;
-  EXPECT_TRUE(base::CreateTemporaryFile(&file));
-  ScopedPathUnlinker unlinker(file.value());
-  EXPECT_FALSE(utils::IsMountpoint(file.value()));
+  test_utils::ScopedTempFile file;
+  EXPECT_FALSE(utils::IsMountpoint(file.path()));
 }
 
 }  // namespace chromeos_update_engine
diff --git a/omaha_response_handler_action_unittest.cc b/omaha_response_handler_action_unittest.cc
index 9e2cdd1..909452a 100644
--- a/omaha_response_handler_action_unittest.cc
+++ b/omaha_response_handler_action_unittest.cc
@@ -159,11 +159,8 @@
 }
 
 TEST_F(OmahaResponseHandlerActionTest, SimpleTest) {
-  string test_deadline_file;
-  CHECK(utils::MakeTempFile("omaha_response_handler_action_unittest-XXXXXX",
-                            &test_deadline_file,
-                            nullptr));
-  ScopedPathUnlinker deadline_unlinker(test_deadline_file);
+  test_utils::ScopedTempFile test_deadline_file(
+      "omaha_response_handler_action_unittest-XXXXXX");
   {
     OmahaResponse in;
     in.update_exists = true;
@@ -176,15 +173,15 @@
     in.prompt = false;
     in.deadline = "20101020";
     InstallPlan install_plan;
-    EXPECT_TRUE(DoTest(in, test_deadline_file, &install_plan));
+    EXPECT_TRUE(DoTest(in, test_deadline_file.path(), &install_plan));
     EXPECT_EQ(in.packages[0].payload_urls[0], install_plan.download_url);
     EXPECT_EQ(expected_hash_, install_plan.payloads[0].hash);
     EXPECT_EQ(1U, install_plan.target_slot);
     string deadline;
-    EXPECT_TRUE(utils::ReadFile(test_deadline_file, &deadline));
+    EXPECT_TRUE(utils::ReadFile(test_deadline_file.path(), &deadline));
     EXPECT_EQ("20101020", deadline);
     struct stat deadline_stat;
-    EXPECT_EQ(0, stat(test_deadline_file.c_str(), &deadline_stat));
+    EXPECT_EQ(0, stat(test_deadline_file.path().c_str(), &deadline_stat));
     EXPECT_EQ(
         static_cast<mode_t>(S_IFREG | S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH),
         deadline_stat.st_mode);
@@ -203,12 +200,12 @@
     InstallPlan install_plan;
     // Set the other slot as current.
     fake_system_state_.fake_boot_control()->SetCurrentSlot(1);
-    EXPECT_TRUE(DoTest(in, test_deadline_file, &install_plan));
+    EXPECT_TRUE(DoTest(in, test_deadline_file.path(), &install_plan));
     EXPECT_EQ(in.packages[0].payload_urls[0], install_plan.download_url);
     EXPECT_EQ(expected_hash_, install_plan.payloads[0].hash);
     EXPECT_EQ(0U, install_plan.target_slot);
     string deadline;
-    EXPECT_TRUE(utils::ReadFile(test_deadline_file, &deadline) &&
+    EXPECT_TRUE(utils::ReadFile(test_deadline_file.path(), &deadline) &&
                 deadline.empty());
     EXPECT_EQ(in.version, install_plan.version);
   }
@@ -223,12 +220,12 @@
     in.deadline = "some-deadline";
     InstallPlan install_plan;
     fake_system_state_.fake_boot_control()->SetCurrentSlot(0);
-    EXPECT_TRUE(DoTest(in, test_deadline_file, &install_plan));
+    EXPECT_TRUE(DoTest(in, test_deadline_file.path(), &install_plan));
     EXPECT_EQ(in.packages[0].payload_urls[0], install_plan.download_url);
     EXPECT_EQ(expected_hash_, install_plan.payloads[0].hash);
     EXPECT_EQ(1U, install_plan.target_slot);
     string deadline;
-    EXPECT_TRUE(utils::ReadFile(test_deadline_file, &deadline));
+    EXPECT_TRUE(utils::ReadFile(test_deadline_file.path(), &deadline));
     EXPECT_EQ("some-deadline", deadline);
     EXPECT_EQ(in.version, install_plan.version);
   }
diff --git a/payload_consumer/delta_performer_integration_test.cc b/payload_consumer/delta_performer_integration_test.cc
index ef99cc9..52cc1df 100644
--- a/payload_consumer/delta_performer_integration_test.cc
+++ b/payload_consumer/delta_performer_integration_test.cc
@@ -234,9 +234,7 @@
     RSA_free(rsa);
   }
   int signature_size = GetSignatureSize(private_key_path);
-  string hash_file;
-  ASSERT_TRUE(utils::MakeTempFile("hash.XXXXXX", &hash_file, nullptr));
-  ScopedPathUnlinker hash_unlinker(hash_file);
+  test_utils::ScopedTempFile hash_file("hash.XXXXXX");
   string signature_size_string;
   if (signature_test == kSignatureGeneratedShellRotateCl1 ||
       signature_test == kSignatureGeneratedShellRotateCl2)
@@ -251,28 +249,25 @@
                 delta_generator_path.c_str(),
                 payload_path.c_str(),
                 signature_size_string.c_str(),
-                hash_file.c_str())));
+                hash_file.path().c_str())));
 
   // Sign the hash
   brillo::Blob hash, signature;
-  ASSERT_TRUE(utils::ReadFile(hash_file, &hash));
+  ASSERT_TRUE(utils::ReadFile(hash_file.path(), &hash));
   ASSERT_TRUE(PayloadSigner::SignHash(hash, private_key_path, &signature));
 
-  string sig_file;
-  ASSERT_TRUE(utils::MakeTempFile("signature.XXXXXX", &sig_file, nullptr));
-  ScopedPathUnlinker sig_unlinker(sig_file);
-  ASSERT_TRUE(test_utils::WriteFileVector(sig_file, signature));
+  test_utils::ScopedTempFile sig_file("signature.XXXXXX");
+  ASSERT_TRUE(test_utils::WriteFileVector(sig_file.path(), signature));
+  string sig_files = sig_file.path();
 
-  string sig_file2;
-  ASSERT_TRUE(utils::MakeTempFile("signature.XXXXXX", &sig_file2, nullptr));
-  ScopedPathUnlinker sig2_unlinker(sig_file2);
+  test_utils::ScopedTempFile sig_file2("signature.XXXXXX");
   if (signature_test == kSignatureGeneratedShellRotateCl1 ||
       signature_test == kSignatureGeneratedShellRotateCl2) {
     ASSERT_TRUE(PayloadSigner::SignHash(
         hash, GetBuildArtifactsPath(kUnittestPrivateKey2Path), &signature));
-    ASSERT_TRUE(test_utils::WriteFileVector(sig_file2, signature));
+    ASSERT_TRUE(test_utils::WriteFileVector(sig_file2.path(), signature));
     // Append second sig file to first path
-    sig_file += ":" + sig_file2;
+    sig_files += ":" + sig_file2.path();
   }
 
   ASSERT_EQ(0,
@@ -280,7 +275,7 @@
                 "%s -in_file=%s -signature_file=%s -out_file=%s",
                 delta_generator_path.c_str(),
                 payload_path.c_str(),
-                sig_file.c_str(),
+                sig_files.c_str(),
                 payload_path.c_str())));
   int verify_result = System(base::StringPrintf(
       "%s -in_file=%s -public_key=%s -public_key_version=%d",
diff --git a/payload_consumer/delta_performer_unittest.cc b/payload_consumer/delta_performer_unittest.cc
index c3e4fdb..c2e11e5 100644
--- a/payload_consumer/delta_performer_unittest.cc
+++ b/payload_consumer/delta_performer_unittest.cc
@@ -185,12 +185,8 @@
                                bool sign_payload,
                                uint64_t major_version,
                                uint32_t minor_version) {
-    string blob_path;
-    EXPECT_TRUE(utils::MakeTempFile("Blob-XXXXXX", &blob_path, nullptr));
-    ScopedPathUnlinker blob_unlinker(blob_path);
-    EXPECT_TRUE(utils::WriteFile(blob_path.c_str(),
-                                 blob_data.data(),
-                                 blob_data.size()));
+    test_utils::ScopedTempFile blob_file("Blob-XXXXXX");
+    EXPECT_TRUE(test_utils::WriteFileVector(blob_file.path(), blob_data));
 
     PayloadGenerationConfig config;
     config.version.major = major_version;
@@ -218,16 +214,16 @@
     new_part.size = 0;
     payload.AddPartition(old_part, new_part, {});
 
-    string payload_path;
-    EXPECT_TRUE(utils::MakeTempFile("Payload-XXXXXX", &payload_path, nullptr));
-    ScopedPathUnlinker payload_unlinker(payload_path);
+    test_utils::ScopedTempFile payload_file("Payload-XXXXXX");
     string private_key =
         sign_payload ? GetBuildArtifactsPath(kUnittestPrivateKeyPath) : "";
-    EXPECT_TRUE(payload.WritePayload(
-        payload_path, blob_path, private_key, &payload_.metadata_size));
+    EXPECT_TRUE(payload.WritePayload(payload_file.path(),
+                                     blob_file.path(),
+                                     private_key,
+                                     &payload_.metadata_size));
 
     brillo::Blob payload_data;
-    EXPECT_TRUE(utils::ReadFile(payload_path, &payload_data));
+    EXPECT_TRUE(utils::ReadFile(payload_file.path(), &payload_data));
     return payload_data;
   }
 
@@ -268,16 +264,13 @@
                                   const string& source_path,
                                   const brillo::Blob& target_data,
                                   bool expect_success) {
-    string new_part;
-    EXPECT_TRUE(utils::MakeTempFile("Partition-XXXXXX", &new_part, nullptr));
-    ScopedPathUnlinker partition_unlinker(new_part);
-    EXPECT_TRUE(utils::WriteFile(new_part.c_str(), target_data.data(),
-                                 target_data.size()));
+    test_utils::ScopedTempFile new_part("Partition-XXXXXX");
+    EXPECT_TRUE(test_utils::WriteFileVector(new_part.path(), target_data));
 
     // We installed the operations only in the rootfs partition, but the
     // delta performer needs to access all the partitions.
     fake_boot_control_.SetPartitionDevice(
-        kLegacyPartitionNameRoot, install_plan_.target_slot, new_part);
+        kLegacyPartitionNameRoot, install_plan_.target_slot, new_part.path());
     fake_boot_control_.SetPartitionDevice(
         kLegacyPartitionNameRoot, install_plan_.source_slot, source_path);
     fake_boot_control_.SetPartitionDevice(
@@ -290,7 +283,7 @@
     EXPECT_EQ(0, performer_.Close());
 
     brillo::Blob partition_data;
-    EXPECT_TRUE(utils::ReadFile(new_part, &partition_data));
+    EXPECT_TRUE(utils::ReadFile(new_part.path(), &partition_data));
     return partition_data;
   }
 
@@ -568,15 +561,10 @@
 
   brillo::Blob payload_data = GeneratePayload(brillo::Blob(), {aop}, false);
 
-  string source_path;
-  EXPECT_TRUE(utils::MakeTempFile("Source-XXXXXX",
-                                  &source_path, nullptr));
-  ScopedPathUnlinker path_unlinker(source_path);
-  EXPECT_TRUE(utils::WriteFile(source_path.c_str(),
-                               expected_data.data(),
-                               expected_data.size()));
+  test_utils::ScopedTempFile source("Source-XXXXXX");
+  EXPECT_TRUE(test_utils::WriteFileVector(source.path(), expected_data));
 
-  EXPECT_EQ(expected_data, ApplyPayload(payload_data, source_path, true));
+  EXPECT_EQ(expected_data, ApplyPayload(payload_data, source.path(), true));
 }
 
 TEST_F(DeltaPerformerTest, PuffdiffOperationTest) {
@@ -596,13 +584,11 @@
 
   brillo::Blob payload_data = GeneratePayload(puffdiff_payload, {aop}, false);
 
-  string source_path;
-  EXPECT_TRUE(utils::MakeTempFile("Source-XXXXXX", &source_path, nullptr));
-  ScopedPathUnlinker path_unlinker(source_path);
-  EXPECT_TRUE(utils::WriteFile(source_path.c_str(), src.data(), src.size()));
+  test_utils::ScopedTempFile source("Source-XXXXXX");
+  EXPECT_TRUE(test_utils::WriteFileVector(source.path(), src));
 
   brillo::Blob dst(std::begin(dst_deflates), std::end(dst_deflates));
-  EXPECT_EQ(dst, ApplyPayload(payload_data, source_path, true));
+  EXPECT_EQ(dst, ApplyPayload(payload_data, source.path(), true));
 }
 
 TEST_F(DeltaPerformerTest, SourceHashMismatchTest) {
@@ -621,27 +607,21 @@
 
   brillo::Blob payload_data = GeneratePayload(brillo::Blob(), {aop}, false);
 
-  string source_path;
-  EXPECT_TRUE(utils::MakeTempFile("Source-XXXXXX", &source_path, nullptr));
-  ScopedPathUnlinker path_unlinker(source_path);
-  EXPECT_TRUE(utils::WriteFile(source_path.c_str(), actual_data.data(),
-                               actual_data.size()));
+  test_utils::ScopedTempFile source("Source-XXXXXX");
+  EXPECT_TRUE(test_utils::WriteFileVector(source.path(), actual_data));
 
-  EXPECT_EQ(actual_data, ApplyPayload(payload_data, source_path, false));
+  EXPECT_EQ(actual_data, ApplyPayload(payload_data, source.path(), false));
 }
 
 // Test that the error-corrected file descriptor is used to read the partition
 // since the source partition doesn't match the operation hash.
 TEST_F(DeltaPerformerTest, ErrorCorrectionSourceCopyFallbackTest) {
-  const size_t kCopyOperationSize = 4 * 4096;
-  string source_path;
-  EXPECT_TRUE(utils::MakeTempFile("Source-XXXXXX", &source_path, nullptr));
-  ScopedPathUnlinker path_unlinker(source_path);
+  constexpr size_t kCopyOperationSize = 4 * 4096;
+  test_utils::ScopedTempFile source("Source-XXXXXX");
   // Write invalid data to the source image, which doesn't match the expected
   // hash.
   brillo::Blob invalid_data(kCopyOperationSize, 0x55);
-  EXPECT_TRUE(utils::WriteFile(
-      source_path.c_str(), invalid_data.data(), invalid_data.size()));
+  EXPECT_TRUE(test_utils::WriteFileVector(source.path(), invalid_data));
 
   // Setup the fec file descriptor as the fake stream, which matches
   // |expected_data|.
@@ -649,7 +629,7 @@
   brillo::Blob expected_data = FakeFileDescriptorData(kCopyOperationSize);
 
   brillo::Blob payload_data = GenerateSourceCopyPayload(expected_data, true);
-  EXPECT_EQ(expected_data, ApplyPayload(payload_data, source_path, true));
+  EXPECT_EQ(expected_data, ApplyPayload(payload_data, source.path(), true));
   // Verify that the fake_fec was actually used.
   EXPECT_EQ(1U, fake_fec->GetReadOps().size());
   EXPECT_EQ(1U, GetSourceEccRecoveredFailures());
@@ -659,14 +639,11 @@
 // when no hash is available for SOURCE_COPY but it falls back to the normal
 // file descriptor when the size of the error corrected one is too small.
 TEST_F(DeltaPerformerTest, ErrorCorrectionSourceCopyWhenNoHashFallbackTest) {
-  const size_t kCopyOperationSize = 4 * 4096;
-  string source_path;
-  EXPECT_TRUE(utils::MakeTempFile("Source-XXXXXX", &source_path, nullptr));
-  ScopedPathUnlinker path_unlinker(source_path);
+  constexpr size_t kCopyOperationSize = 4 * 4096;
+  test_utils::ScopedTempFile source("Source-XXXXXX");
   // Setup the source path with the right expected data.
   brillo::Blob expected_data = FakeFileDescriptorData(kCopyOperationSize);
-  EXPECT_TRUE(utils::WriteFile(
-      source_path.c_str(), expected_data.data(), expected_data.size()));
+  EXPECT_TRUE(test_utils::WriteFileVector(source.path(), expected_data));
 
   // Setup the fec file descriptor as the fake stream, with smaller data than
   // the expected.
@@ -674,7 +651,7 @@
 
   // The payload operation doesn't include an operation hash.
   brillo::Blob payload_data = GenerateSourceCopyPayload(expected_data, false);
-  EXPECT_EQ(expected_data, ApplyPayload(payload_data, source_path, true));
+  EXPECT_EQ(expected_data, ApplyPayload(payload_data, source.path(), true));
   // Verify that the fake_fec was attempted to be used. Since the file
   // descriptor is shorter it can actually do more than one read to realize it
   // reached the EOF.
@@ -685,18 +662,15 @@
 }
 
 TEST_F(DeltaPerformerTest, ChooseSourceFDTest) {
-  const size_t kSourceSize = 4 * 4096;
-  string source_path;
-  EXPECT_TRUE(utils::MakeTempFile("Source-XXXXXX", &source_path, nullptr));
-  ScopedPathUnlinker path_unlinker(source_path);
+  constexpr size_t kSourceSize = 4 * 4096;
+  test_utils::ScopedTempFile source("Source-XXXXXX");
   // Write invalid data to the source image, which doesn't match the expected
   // hash.
   brillo::Blob invalid_data(kSourceSize, 0x55);
-  EXPECT_TRUE(utils::WriteFile(
-      source_path.c_str(), invalid_data.data(), invalid_data.size()));
+  EXPECT_TRUE(test_utils::WriteFileVector(source.path(), invalid_data));
 
   performer_.source_fd_ = std::make_shared<EintrSafeFileDescriptor>();
-  performer_.source_fd_->Open(source_path.c_str(), O_RDONLY);
+  performer_.source_fd_->Open(source.path().c_str(), O_RDONLY);
   performer_.block_size_ = 4096;
 
   // Setup the fec file descriptor as the fake stream, which matches
diff --git a/payload_consumer/file_writer_unittest.cc b/payload_consumer/file_writer_unittest.cc
index 92837c8..05df307 100644
--- a/payload_consumer/file_writer_unittest.cc
+++ b/payload_consumer/file_writer_unittest.cc
@@ -36,19 +36,17 @@
 
 TEST(FileWriterTest, SimpleTest) {
   // Create a uniquely named file for testing.
-  string path;
-  ASSERT_TRUE(utils::MakeTempFile("FileWriterTest-XXXXXX", &path, nullptr));
-  ScopedPathUnlinker path_unlinker(path);
-
+  test_utils::ScopedTempFile file("FileWriterTest-XXXXXX");
   DirectFileWriter file_writer;
-  EXPECT_EQ(0, file_writer.Open(path.c_str(),
-                                O_CREAT | O_LARGEFILE | O_TRUNC | O_WRONLY,
-                                0644));
+  EXPECT_EQ(0,
+            file_writer.Open(file.path().c_str(),
+                             O_CREAT | O_LARGEFILE | O_TRUNC | O_WRONLY,
+                             0644));
   EXPECT_TRUE(file_writer.Write("test", 4));
   brillo::Blob actual_data;
-  EXPECT_TRUE(utils::ReadFile(path, &actual_data));
+  EXPECT_TRUE(utils::ReadFile(file.path(), &actual_data));
 
-  EXPECT_FALSE(memcmp("test", actual_data.data(), actual_data.size()));
+  EXPECT_EQ("test", string(actual_data.begin(), actual_data.end()));
   EXPECT_EQ(0, file_writer.Close());
 }
 
@@ -61,14 +59,12 @@
 
 TEST(FileWriterTest, WriteErrorTest) {
   // Create a uniquely named file for testing.
-  string path;
-  ASSERT_TRUE(utils::MakeTempFile("FileWriterTest-XXXXXX", &path, nullptr));
-  ScopedPathUnlinker path_unlinker(path);
-
+  test_utils::ScopedTempFile file("FileWriterTest-XXXXXX");
   DirectFileWriter file_writer;
-  EXPECT_EQ(0, file_writer.Open(path.c_str(),
-                                O_CREAT | O_LARGEFILE | O_TRUNC | O_RDONLY,
-                                0644));
+  EXPECT_EQ(0,
+            file_writer.Open(file.path().c_str(),
+                             O_CREAT | O_LARGEFILE | O_TRUNC | O_RDONLY,
+                             0644));
   EXPECT_FALSE(file_writer.Write("x", 1));
   EXPECT_EQ(0, file_writer.Close());
 }
diff --git a/payload_consumer/filesystem_verifier_action_unittest.cc b/payload_consumer/filesystem_verifier_action_unittest.cc
index b4f7f7f..fd1d084 100644
--- a/payload_consumer/filesystem_verifier_action_unittest.cc
+++ b/payload_consumer/filesystem_verifier_action_unittest.cc
@@ -112,13 +112,7 @@
 
 bool FilesystemVerifierActionTest::DoTest(bool terminate_early,
                                           bool hash_fail) {
-  string a_loop_file;
-
-  if (!(utils::MakeTempFile("a_loop_file.XXXXXX", &a_loop_file, nullptr))) {
-    ADD_FAILURE();
-    return false;
-  }
-  ScopedPathUnlinker a_loop_file_unlinker(a_loop_file);
+  test_utils::ScopedTempFile a_loop_file("a_loop_file.XXXXXX");
 
   // Make random data for a.
   const size_t kLoopFileSize = 10 * 1024 * 1024 + 512;
@@ -126,7 +120,7 @@
   test_utils::FillWithData(&a_loop_data);
 
   // Write data to disk
-  if (!(test_utils::WriteFileVector(a_loop_file, a_loop_data))) {
+  if (!(test_utils::WriteFileVector(a_loop_file.path(), a_loop_data))) {
     ADD_FAILURE();
     return false;
   }
@@ -134,13 +128,13 @@
   // Attach loop devices to the files
   string a_dev;
   test_utils::ScopedLoopbackDeviceBinder a_dev_releaser(
-      a_loop_file, false, &a_dev);
+      a_loop_file.path(), false, &a_dev);
   if (!(a_dev_releaser.is_bound())) {
     ADD_FAILURE();
     return false;
   }
 
-  LOG(INFO) << "verifying: "  << a_loop_file << " (" << a_dev << ")";
+  LOG(INFO) << "verifying: " << a_loop_file.path() << " (" << a_dev << ")";
 
   bool success = true;
 
diff --git a/payload_generator/ab_generator_unittest.cc b/payload_generator/ab_generator_unittest.cc
index 25609c7..d083d8a 100644
--- a/payload_generator/ab_generator_unittest.cc
+++ b/payload_generator/ab_generator_unittest.cc
@@ -58,10 +58,6 @@
   const size_t part_num_blocks = 7;
 
   // Create the target partition data.
-  string part_path;
-  EXPECT_TRUE(utils::MakeTempFile(
-      "SplitReplaceOrReplaceBzTest_part.XXXXXX", &part_path, nullptr));
-  ScopedPathUnlinker part_path_unlinker(part_path);
   const size_t part_size = part_num_blocks * kBlockSize;
   brillo::Blob part_data;
   if (compressible) {
@@ -74,7 +70,9 @@
       part_data.push_back(dis(gen));
   }
   ASSERT_EQ(part_size, part_data.size());
-  ASSERT_TRUE(utils::WriteFile(part_path.c_str(), part_data.data(), part_size));
+  test_utils::ScopedTempFile part_file(
+      "SplitReplaceOrReplaceBzTest_part.XXXXXX");
+  ASSERT_TRUE(test_utils::WriteFileVector(part_file.path(), part_data));
 
   // Create original operation and blob data.
   const size_t op_ex1_offset = op_ex1_start_block * kBlockSize;
@@ -109,15 +107,12 @@
   aop.name = "SplitTestOp";
 
   // Create the data file.
-  string data_path;
-  EXPECT_TRUE(utils::MakeTempFile(
-      "SplitReplaceOrReplaceBzTest_data.XXXXXX", &data_path, nullptr));
-  ScopedPathUnlinker data_path_unlinker(data_path);
-  int data_fd = open(data_path.c_str(), O_RDWR, 000);
+  test_utils::ScopedTempFile data_file(
+      "SplitReplaceOrReplaceBzTest_data.XXXXXX");
+  EXPECT_TRUE(test_utils::WriteFileVector(data_file.path(), op_blob));
+  int data_fd = open(data_file.path().c_str(), O_RDWR, 000);
   EXPECT_GE(data_fd, 0);
   ScopedFdCloser data_fd_closer(&data_fd);
-  EXPECT_TRUE(utils::WriteFile(data_path.c_str(), op_blob.data(),
-                               op_blob.size()));
   off_t data_file_size = op_blob.size();
   BlobFileWriter blob_file(data_fd, &data_file_size);
 
@@ -126,7 +121,7 @@
   PayloadVersion version(kChromeOSMajorPayloadVersion,
                          kSourceMinorPayloadVersion);
   ASSERT_TRUE(ABGenerator::SplitAReplaceOp(
-      version, aop, part_path, &result_ops, &blob_file));
+      version, aop, part_file.path(), &result_ops, &blob_file));
 
   // Check the result.
   InstallOperation_Type expected_type =
@@ -212,10 +207,6 @@
   const size_t part_num_blocks = total_op_num_blocks + 2;
 
   // Create the target partition data.
-  string part_path;
-  EXPECT_TRUE(utils::MakeTempFile(
-      "MergeReplaceOrReplaceBzTest_part.XXXXXX", &part_path, nullptr));
-  ScopedPathUnlinker part_path_unlinker(part_path);
   const size_t part_size = part_num_blocks * kBlockSize;
   brillo::Blob part_data;
   if (compressible) {
@@ -228,7 +219,9 @@
       part_data.push_back(dis(gen));
   }
   ASSERT_EQ(part_size, part_data.size());
-  ASSERT_TRUE(utils::WriteFile(part_path.c_str(), part_data.data(), part_size));
+  test_utils::ScopedTempFile part_file(
+      "MergeReplaceOrReplaceBzTest_part.XXXXXX");
+  ASSERT_TRUE(test_utils::WriteFileVector(part_file.path(), part_data));
 
   // Create original operations and blob data.
   vector<AnnotatedOperation> aops;
@@ -277,23 +270,20 @@
   aops.push_back(second_aop);
 
   // Create the data file.
-  string data_path;
-  EXPECT_TRUE(utils::MakeTempFile(
-      "MergeReplaceOrReplaceBzTest_data.XXXXXX", &data_path, nullptr));
-  ScopedPathUnlinker data_path_unlinker(data_path);
-  int data_fd = open(data_path.c_str(), O_RDWR, 000);
+  test_utils::ScopedTempFile data_file(
+      "MergeReplaceOrReplaceBzTest_data.XXXXXX");
+  EXPECT_TRUE(test_utils::WriteFileVector(data_file.path(), blob_data));
+  int data_fd = open(data_file.path().c_str(), O_RDWR, 000);
   EXPECT_GE(data_fd, 0);
   ScopedFdCloser data_fd_closer(&data_fd);
-  EXPECT_TRUE(utils::WriteFile(data_path.c_str(), blob_data.data(),
-                               blob_data.size()));
   off_t data_file_size = blob_data.size();
   BlobFileWriter blob_file(data_fd, &data_file_size);
 
   // Merge the operations.
   PayloadVersion version(kChromeOSMajorPayloadVersion,
                          kSourceMinorPayloadVersion);
-  EXPECT_TRUE(
-      ABGenerator::MergeOperations(&aops, version, 5, part_path, &blob_file));
+  EXPECT_TRUE(ABGenerator::MergeOperations(
+      &aops, version, 5, part_file.path(), &blob_file));
 
   // Check the result.
   InstallOperation_Type expected_op_type =
@@ -570,16 +560,12 @@
   second_aop.op = second_op;
   aops.push_back(second_aop);
 
-  string src_part_path;
-  EXPECT_TRUE(utils::MakeTempFile("AddSourceHashTest_src_part.XXXXXX",
-                                  &src_part_path, nullptr));
-  ScopedPathUnlinker src_part_path_unlinker(src_part_path);
+  test_utils::ScopedTempFile src_part_file("AddSourceHashTest_src_part.XXXXXX");
   brillo::Blob src_data(kBlockSize);
   test_utils::FillWithData(&src_data);
-  ASSERT_TRUE(utils::WriteFile(src_part_path.c_str(), src_data.data(),
-                               src_data.size()));
+  ASSERT_TRUE(test_utils::WriteFileVector(src_part_file.path(), src_data));
 
-  EXPECT_TRUE(ABGenerator::AddSourceHash(&aops, src_part_path));
+  EXPECT_TRUE(ABGenerator::AddSourceHash(&aops, src_part_file.path()));
 
   EXPECT_TRUE(aops[0].op.has_src_sha256_hash());
   EXPECT_FALSE(aops[1].op.has_src_sha256_hash());
diff --git a/payload_generator/block_mapping_unittest.cc b/payload_generator/block_mapping_unittest.cc
index 4d09710..e1870ec 100644
--- a/payload_generator/block_mapping_unittest.cc
+++ b/payload_generator/block_mapping_unittest.cc
@@ -39,23 +39,9 @@
 
 class BlockMappingTest : public ::testing::Test {
  protected:
-  void SetUp() override {
-    EXPECT_TRUE(utils::MakeTempFile("BlockMappingTest_old.XXXXXX",
-                                    &old_part_path_,
-                                    nullptr));
-    EXPECT_TRUE(utils::MakeTempFile("BlockMappingTest_new.XXXXXX",
-                                    &new_part_path_,
-                                    nullptr));
-
-    old_part_unlinker_.reset(new ScopedPathUnlinker(old_part_path_));
-    new_part_unlinker_.reset(new ScopedPathUnlinker(new_part_path_));
-  }
-
   // Old new partition files used in testing.
-  string old_part_path_;
-  string new_part_path_;
-  std::unique_ptr<ScopedPathUnlinker> old_part_unlinker_;
-  std::unique_ptr<ScopedPathUnlinker> new_part_unlinker_;
+  test_utils::ScopedTempFile old_part_{"BlockMappingTest_old.XXXXXX"};
+  test_utils::ScopedTempFile new_part_{"BlockMappingTest_new.XXXXXX"};
 
   size_t block_size_{1024};
   BlockMapping bm_{block_size_};  // BlockMapping under test.
@@ -72,8 +58,8 @@
 }
 
 TEST_F(BlockMappingTest, BlocksAreNotKeptInMemory) {
-  test_utils::WriteFileString(old_part_path_, string(block_size_, 'a'));
-  int old_fd = HANDLE_EINTR(open(old_part_path_.c_str(), O_RDONLY));
+  test_utils::WriteFileString(old_part_.path(), string(block_size_, 'a'));
+  int old_fd = HANDLE_EINTR(open(old_part_.path().c_str(), O_RDONLY));
   ScopedFdCloser old_fd_closer(&old_fd);
 
   EXPECT_EQ(0, bm_.AddDiskBlock(old_fd, 0));
@@ -107,18 +93,18 @@
   string old_contents(10 * block_size_, '\0');
   for (size_t i = 0; i < old_contents.size(); ++i)
     old_contents[i] = 4 + i / block_size_;
-  test_utils::WriteFileString(old_part_path_, old_contents);
+  test_utils::WriteFileString(old_part_.path(), old_contents);
 
   // A string including the block with all zeros and overlapping some of the
   // other blocks in old_contents.
   string new_contents(6 * block_size_, '\0');
   for (size_t i = 0; i < new_contents.size(); ++i)
     new_contents[i] = i / block_size_;
-  test_utils::WriteFileString(new_part_path_, new_contents);
+  test_utils::WriteFileString(new_part_.path(), new_contents);
 
   vector<BlockMapping::BlockId> old_ids, new_ids;
-  EXPECT_TRUE(MapPartitionBlocks(old_part_path_,
-                                 new_part_path_,
+  EXPECT_TRUE(MapPartitionBlocks(old_part_.path(),
+                                 new_part_.path(),
                                  old_contents.size(),
                                  new_contents.size(),
                                  block_size_,
diff --git a/payload_generator/full_update_generator_unittest.cc b/payload_generator/full_update_generator_unittest.cc
index 6da4d10..e398125 100644
--- a/payload_generator/full_update_generator_unittest.cc
+++ b/payload_generator/full_update_generator_unittest.cc
@@ -40,15 +40,11 @@
     config_.hard_chunk_size = 128 * 1024;
     config_.block_size = 4096;
 
-    EXPECT_TRUE(utils::MakeTempFile("FullUpdateTest_partition.XXXXXX",
-                                    &new_part_conf.path,
-                                    nullptr));
-    EXPECT_TRUE(utils::MakeTempFile("FullUpdateTest_blobs.XXXXXX",
-                                    &out_blobs_path_,
-                                    &out_blobs_fd_));
+    new_part_conf.path = part_file_.path();
+    EXPECT_TRUE(utils::MakeTempFile(
+        "FullUpdateTest_blobs.XXXXXX", &out_blobs_path_, &out_blobs_fd_));
 
     blob_file_.reset(new BlobFileWriter(out_blobs_fd_, &out_blobs_length_));
-    part_path_unlinker_.reset(new ScopedPathUnlinker(new_part_conf.path));
     out_blobs_unlinker_.reset(new ScopedPathUnlinker(out_blobs_path_));
   }
 
@@ -62,9 +58,9 @@
   int out_blobs_fd_{-1};
   off_t out_blobs_length_{0};
   ScopedFdCloser out_blobs_fd_closer_{&out_blobs_fd_};
+  test_utils::ScopedTempFile part_file_{"FullUpdateTest_partition.XXXXXX"};
 
   std::unique_ptr<BlobFileWriter> blob_file_;
-  std::unique_ptr<ScopedPathUnlinker> part_path_unlinker_;
   std::unique_ptr<ScopedPathUnlinker> out_blobs_unlinker_;
 
   // FullUpdateGenerator under test.
diff --git a/payload_generator/payload_file_unittest.cc b/payload_generator/payload_file_unittest.cc
index e8e7e14..45faebb9 100644
--- a/payload_generator/payload_file_unittest.cc
+++ b/payload_generator/payload_file_unittest.cc
@@ -36,23 +36,16 @@
 };
 
 TEST_F(PayloadFileTest, ReorderBlobsTest) {
-  string orig_blobs;
-  EXPECT_TRUE(utils::MakeTempFile("ReorderBlobsTest.orig.XXXXXX", &orig_blobs,
-                                  nullptr));
-  ScopedPathUnlinker orig_blobs_unlinker(orig_blobs);
+  test_utils::ScopedTempFile orig_blobs("ReorderBlobsTest.orig.XXXXXX");
 
   // The operations have three blob and one gap (the whitespace):
   // Rootfs operation 1: [8, 3] bcd
   // Rootfs operation 2: [7, 1] a
   // Kernel operation 1: [0, 6] kernel
   string orig_data = "kernel abcd";
-  EXPECT_TRUE(
-      utils::WriteFile(orig_blobs.c_str(), orig_data.data(), orig_data.size()));
+  EXPECT_TRUE(test_utils::WriteFileString(orig_blobs.path(), orig_data));
 
-  string new_blobs;
-  EXPECT_TRUE(
-      utils::MakeTempFile("ReorderBlobsTest.new.XXXXXX", &new_blobs, nullptr));
-  ScopedPathUnlinker new_blobs_unlinker(new_blobs);
+  test_utils::ScopedTempFile new_blobs("ReorderBlobsTest.new.XXXXXX");
 
   payload_.part_vec_.resize(2);
 
@@ -71,12 +64,12 @@
   aop.op.set_data_length(6);
   payload_.part_vec_[1].aops = {aop};
 
-  EXPECT_TRUE(payload_.ReorderDataBlobs(orig_blobs, new_blobs));
+  EXPECT_TRUE(payload_.ReorderDataBlobs(orig_blobs.path(), new_blobs.path()));
 
   const vector<AnnotatedOperation>& part0_aops = payload_.part_vec_[0].aops;
   const vector<AnnotatedOperation>& part1_aops = payload_.part_vec_[1].aops;
   string new_data;
-  EXPECT_TRUE(utils::ReadFile(new_blobs, &new_data));
+  EXPECT_TRUE(utils::ReadFile(new_blobs.path(), &new_data));
   // Kernel blobs should appear at the end.
   EXPECT_EQ("bcdakernel", new_data);
 
diff --git a/payload_generator/payload_signer_unittest.cc b/payload_generator/payload_signer_unittest.cc
index 62b6e7a..fc0925a 100644
--- a/payload_generator/payload_signer_unittest.cc
+++ b/payload_generator/payload_signer_unittest.cc
@@ -127,16 +127,14 @@
   void DoWriteAndLoadPayloadTest(const PayloadGenerationConfig& config) {
     PayloadFile payload;
     payload.Init(config);
-    string payload_path;
-    EXPECT_TRUE(utils::MakeTempFile("payload.XXXXXX", &payload_path, nullptr));
-    ScopedPathUnlinker payload_path_unlinker(payload_path);
+    test_utils::ScopedTempFile payload_file("payload.XXXXXX");
     uint64_t metadata_size;
-    EXPECT_TRUE(
-        payload.WritePayload(payload_path, "/dev/null", "", &metadata_size));
+    EXPECT_TRUE(payload.WritePayload(
+        payload_file.path(), "/dev/null", "", &metadata_size));
     brillo::Blob payload_metadata_blob;
     DeltaArchiveManifest manifest;
     uint64_t load_metadata_size, load_major_version;
-    EXPECT_TRUE(PayloadSigner::LoadPayloadMetadata(payload_path,
+    EXPECT_TRUE(PayloadSigner::LoadPayloadMetadata(payload_file.path(),
                                                    &payload_metadata_blob,
                                                    &manifest,
                                                    &load_major_version,
@@ -215,50 +213,46 @@
 }
 
 TEST_F(PayloadSignerTest, SkipMetadataSignatureTest) {
-  string payload_path;
-  EXPECT_TRUE(utils::MakeTempFile("payload.XXXXXX", &payload_path, nullptr));
-  ScopedPathUnlinker payload_path_unlinker(payload_path);
-
+  test_utils::ScopedTempFile payload_file("payload.XXXXXX");
   PayloadGenerationConfig config;
   config.version.major = kBrilloMajorPayloadVersion;
   PayloadFile payload;
   EXPECT_TRUE(payload.Init(config));
   uint64_t metadata_size;
-  EXPECT_TRUE(
-      payload.WritePayload(payload_path, "/dev/null", "", &metadata_size));
+  EXPECT_TRUE(payload.WritePayload(
+      payload_file.path(), "/dev/null", "", &metadata_size));
   const vector<int> sizes = {256};
   brillo::Blob unsigned_payload_hash, unsigned_metadata_hash;
-  EXPECT_TRUE(PayloadSigner::HashPayloadForSigning(
-      payload_path, sizes, &unsigned_payload_hash, &unsigned_metadata_hash));
+  EXPECT_TRUE(PayloadSigner::HashPayloadForSigning(payload_file.path(),
+                                                   sizes,
+                                                   &unsigned_payload_hash,
+                                                   &unsigned_metadata_hash));
   EXPECT_TRUE(
-      payload.WritePayload(payload_path,
+      payload.WritePayload(payload_file.path(),
                            "/dev/null",
                            GetBuildArtifactsPath(kUnittestPrivateKeyPath),
                            &metadata_size));
   brillo::Blob signed_payload_hash, signed_metadata_hash;
   EXPECT_TRUE(PayloadSigner::HashPayloadForSigning(
-      payload_path, sizes, &signed_payload_hash, &signed_metadata_hash));
+      payload_file.path(), sizes, &signed_payload_hash, &signed_metadata_hash));
   EXPECT_EQ(unsigned_payload_hash, signed_payload_hash);
   EXPECT_EQ(unsigned_metadata_hash, signed_metadata_hash);
 }
 
 TEST_F(PayloadSignerTest, VerifySignedPayloadTest) {
-  string payload_path;
-  EXPECT_TRUE(utils::MakeTempFile("payload.XXXXXX", &payload_path, nullptr));
-  ScopedPathUnlinker payload_path_unlinker(payload_path);
-
+  test_utils::ScopedTempFile payload_file("payload.XXXXXX");
   PayloadGenerationConfig config;
   config.version.major = kBrilloMajorPayloadVersion;
   PayloadFile payload;
   EXPECT_TRUE(payload.Init(config));
   uint64_t metadata_size;
   EXPECT_TRUE(
-      payload.WritePayload(payload_path,
+      payload.WritePayload(payload_file.path(),
                            "/dev/null",
                            GetBuildArtifactsPath(kUnittestPrivateKeyPath),
                            &metadata_size));
   EXPECT_TRUE(PayloadSigner::VerifySignedPayload(
-      payload_path, GetBuildArtifactsPath(kUnittestPublicKeyPath)));
+      payload_file.path(), GetBuildArtifactsPath(kUnittestPublicKeyPath)));
 }
 
 }  // namespace chromeos_update_engine