diff --git a/base/include/android-base/test_utils.h b/base/include/android-base/test_utils.h
index 4ea3c8e..c0bf0c1 100644
--- a/base/include/android-base/test_utils.h
+++ b/base/include/android-base/test_utils.h
@@ -48,4 +48,21 @@
   DISALLOW_COPY_AND_ASSIGN(TemporaryDir);
 };
 
+class CapturedStderr {
+ public:
+  CapturedStderr();
+  ~CapturedStderr();
+
+  int fd() const;
+
+ private:
+  void init();
+  void reset();
+
+  TemporaryFile temp_file_;
+  int old_stderr_;
+
+  DISALLOW_COPY_AND_ASSIGN(CapturedStderr);
+};
+
 #endif  // ANDROID_BASE_TEST_UTILS_H
diff --git a/base/logging_test.cpp b/base/logging_test.cpp
index 1ee181a..2d9c2ba 100644
--- a/base/logging_test.cpp
+++ b/base/logging_test.cpp
@@ -37,42 +37,6 @@
 #define HOST_TEST(suite, name) TEST(suite, name)
 #endif
 
-class CapturedStderr {
- public:
-  CapturedStderr() : old_stderr_(-1) {
-    init();
-  }
-
-  ~CapturedStderr() {
-    reset();
-  }
-
-  int fd() const {
-    return temp_file_.fd;
-  }
-
- private:
-  void init() {
-#if defined(_WIN32)
-    // On Windows, stderr is often buffered, so make sure it is unbuffered so
-    // that we can immediately read back what was written to stderr.
-    ASSERT_EQ(0, setvbuf(stderr, NULL, _IONBF, 0));
-#endif
-    old_stderr_ = dup(STDERR_FILENO);
-    ASSERT_NE(-1, old_stderr_);
-    ASSERT_NE(-1, dup2(fd(), STDERR_FILENO));
-  }
-
-  void reset() {
-    ASSERT_NE(-1, dup2(old_stderr_, STDERR_FILENO));
-    ASSERT_EQ(0, close(old_stderr_));
-    // Note: cannot restore prior setvbuf() setting.
-  }
-
-  TemporaryFile temp_file_;
-  int old_stderr_;
-};
-
 #if defined(_WIN32)
 static void ExitSignalAbortHandler(int) {
   _exit(3);
diff --git a/base/test_utils.cpp b/base/test_utils.cpp
index 635af6c..3b3d698 100644
--- a/base/test_utils.cpp
+++ b/base/test_utils.cpp
@@ -102,3 +102,32 @@
            OS_PATH_SEPARATOR);
   return (mkdtemp(path) != nullptr);
 }
+
+CapturedStderr::CapturedStderr() : old_stderr_(-1) {
+  init();
+}
+
+CapturedStderr::~CapturedStderr() {
+  reset();
+}
+
+int CapturedStderr::fd() const {
+  return temp_file_.fd;
+}
+
+void CapturedStderr::init() {
+#if defined(_WIN32)
+  // On Windows, stderr is often buffered, so make sure it is unbuffered so
+  // that we can immediately read back what was written to stderr.
+  CHECK_EQ(0, setvbuf(stderr, NULL, _IONBF, 0));
+#endif
+  old_stderr_ = dup(STDERR_FILENO);
+  CHECK_NE(-1, old_stderr_);
+  CHECK_NE(-1, dup2(fd(), STDERR_FILENO));
+}
+
+void CapturedStderr::reset() {
+  CHECK_NE(-1, dup2(old_stderr_, STDERR_FILENO));
+  CHECK_EQ(0, close(old_stderr_));
+  // Note: cannot restore prior setvbuf() setting.
+}